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| ​ | Maryland                                                      | ​ | ​ | 47-1696350                          | ​ |
|---------|---------------------------------------------------------------|---------|---------|-------------------------------------|---------|
| ​ | (State or other jurisdiction ofincorporation or organization) | ​ | ​ | (I.R.S. EmployerIdentification No.) | ​ |
| ​ | 1920 Rock Spring Road, Forest Hill, Maryland                  | ​ | ​ | 21050                               | ​ |
| ​ | (Address of principal executive offices)                      | ​ | ​ | (Zip Code)                          | ​ |
| ​ | Large accelerated filer ☐                                             | ​ | ​ | Accelerated filer ☐         | ​ |
|---------|----------------------------------------------------------------------------------|---------|---------|----------------------------------------|---------|
| ​ | Non-accelerated filer ☐ (Do not check if a smaller reporting company) | ​ | ​ | Smaller reporting company ☒ | ​ |
| ​ | Emerging growth company ☐                                             | ​ | ​ |

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| ​ | Reports of Independent Registered Public Accounting Firms                                         | ​ | ​ | ​ | ​ | F-1 | ​ | ​ |
|---------|---------------------------------------------------------------------------------------------------|---------|---------|---------|---------|-----|---------|---------|
| ​ | Consolidated Balance Sheets as of December 31, 2017 and 2016                                 | ​ | ​ | ​ | ​ | F-3 | ​ | ​ |
| ​ | Consolidated Statements of Operations for the Years Ended December 31, 2017 and 2016         | ​ | ​ | ​ | ​ | F-4 | ​ | ​ |
| ​ | Consolidated Statements of Comprehensive Loss for the Years Ended December 31, 2017 and 2016 | ​ | ​ | ​ | ​ | F-5 | ​ | ​ |
| ​ | Consolidated Statements of Equity for the Years Ended December 31, 2017 and 2016             | ​ | ​ | ​ | ​ | F-6 | ​ | ​ |
| ​ | Consolidated Statements of Cash Flows for the Years Ended December 31, 2017 and 2016         | ​ | ​ | ​ | ​ | F-7 | ​ | ​ |
| ​ | Notes to Consolidated Financial Statements                                                        | ​ | ​ | ​ | ​ | F-8 | ​ | ​ |

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| ASSETS                                                                                                                                                   | ​ | ​ | As of December 31, 2017 | ​ | ​ | As of December 31, 2016 | ​ |
|----------------------------------------------------------------------------------------------------------------------------------------------------------|---------|---------|-------------------------|---------|---------|-------------------------|---------|
| (Dollars in thousands)                                                                                                                                   | ​ |
| Cash and due from banks                                                                                                                                  | ​ | ​ | ​                 | $       | 6,603   | ​                 | ​ | ​ | ​ | $ | 5,399 | ​ | ​ |
| Interest bearing deposits in other banks                                                                                                                 | ​ | ​ | ​                 | ​ | 1,362   | ​                 | ​ | ​ | ​ | ​ | 3,868 | ​ | ​ |
| Total cash and cash equivalents                                                                                                                          | ​ | ​ | ​                 | ​ | 7,965   | ​                 | ​ | ​ | ​ | ​ | 9,267 | ​ | ​ |
| Other interest-bearing deposits in other banks                                                                                                           | ​ | ​ | ​                 | ​ | 1,245   | ​                 | ​ | ​ | ​ | ​ | 7,222 | ​ | ​ |
| Investment securities available-for-sale – at fair value                                                                               | ​ | ​ | ​                 | ​ | 16,605  | ​                 | ​ | ​ | ​ | ​ | 3,698 | ​ | ​ |
| Investment securities held to maturity – amortized cost                                                                                | ​ | ​ | ​                 | ​ | 17,410  | ​                 | ​ | ​ | ​ | ​ | 18,818 | ​ | ​ |
| Loans, net of unearned fees                                                                                                                              | ​ | ​ | ​                 | ​ | 95,053  | ​                 | ​ | ​ | ​ | ​ | 87,248 | ​ | ​ |
| Less allowance for loan losses                                                                                                                           | ​ | ​ | ​                 | ​ | (1,288) | ​                 | ​ | ​ | ​ | ​ | (1,218) | ​ | ​ |
| Loans, net                                                                                                                                               | ​ | ​ | ​                 | ​ | 93,765  | ​                 | ​ | ​ | ​ | ​ | 86,030 | ​ | ​ |
| Real estate ground rents                                                                                                                                 | ​ | ​ | ​                 | ​ | 822     | ​                 | ​ | ​ | ​ | ​ | 829 | ​ | ​ |
| Less allowance for credit losses                                                                                                                         | ​ | ​ | ​                 | ​ | (141)   | ​                 | ​ | ​ | ​ | ​ | (141) | ​ | ​ |
| Ground rents, net                                                                                                                                        | ​ | ​ | ​                 | ​ | 681     | ​                 | ​ | ​ | ​ | ​ | 688 | ​ | ​ |
| Federal Home Loan Bank stock, at cost                                                                                                                    | ​ | ​ | ​                 | ​ | 754     | ​                 | ​ | ​ | ​ | ​ | 418 | ​ | ​ |
| Property and equipment – net                                                                                                           | ​ | ​ | ​                 | ​ | 3,664   | ​                 | ​ | ​ | ​ | ​ | 3,677 | ​ | ​ |
| Deferred income taxes                                                                                                                                    | ​ | ​ | ​                 | ​ | — | ​                 | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Bank-owned life insurance                                                                                                                                | ​ | ​ | ​                 | ​ | 4,574   | ​                 | ​ | ​ | ​ | ​ | 931 | ​ | ​ |
| Accrued interest receivable and other assets                                                                                                             | ​ | ​ | ​                 | ​ | 668     | ​                 | ​ | ​ | ​ | ​ | 562 | ​ | ​ |
| TOTAL ASSETS                                                                                                                                             | ​ | ​ | ​                 | $       | 147,331 | ​                 | ​ | ​ | ​ | $ | 131,311 | ​ | ​ |
| LIABILITIES AND STOCKHOLDERS’ EQUITY                                                                                                               | ​ | ​ | ​                 | ​ | ​ | ​                 | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| LIABILITIES:                                                                                                                                             | ​ | ​ | ​                 | ​ | ​ | ​                 | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Deposits                                                                                                                                                 | ​ | ​ | ​                 | $       | 103,308 | ​                 | ​ | ​ | ​ | $ | 93,015 | ​ | ​ |
| Federal Home Loan Bank advances                                                                                                                          | ​ | ​ | ​                 | ​ | 13,000  | ​                 | ​ | ​ | ​ | ​ | 7,000 | ​ | ​ |
| Deferred compensation liability                                                                                                                          | ​ | ​ | ​                 | ​ | 159     | ​                 | ​ | ​ | ​ | ​ | 170 | ​ | ​ |
| Accounts payable and other liabilities                                                                                                                   | ​ | ​ | ​                 | ​ | 504     | ​                 | ​ | ​ | ​ | ​ | 802 | ​ | ​ |
| Total liabilities                                                                                                                                        | ​ | ​ | ​                 | ​ | 116,971 | ​                 | ​ | ​ | ​ | ​ | 100,987 | ​ | ​ |
| STOCKHOLDERS’ EQUITY:                                                                                                                              | ​ | ​ | ​                 | ​ | ​ | ​                 | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Common stock .01 par value; authorized 19,000,000 shares; issued 1,940,200 and 1,902,900 shares at December 31, 2017 and December 31, 2016, respectively | ​ | ​ | ​                 | ​ | 19      | ​                 | ​ | ​ | ​ | ​ | 19 | ​ | ​ |
| Additional paid-in capital                                                                                                                               | ​ | ​ | ​                 | ​ | 18,135  | ​                 | ​ | ​ | ​ | ​ | 18,132 | ​ | ​ |
| Retained earnings – substantially restricted                                                                                           | ​ | ​ | ​                 | ​ | 13,780  | ​                 | ​ | ​ | ​ | ​ | 13,770 | ​ | ​ |
| Accumulated other comprehensive loss                                                                                                                     | ​ | ​ | ​                 | ​ | (229)   | ​                 | ​ | ​ | ​ | ​ | (139) | ​ | ​ |
| Unearned ESOP shares                                                                                                                                     | ​ | ​ | ​                 | ​ | (1,345) | ​                 | ​ | ​ | ​ | ​ | (1,458) | ​ | ​ |
| Total stockholders’ equity                                                                                                                         | ​ | ​ | ​                 | ​ | 30,360  | ​                 | ​ | ​ | ​ | ​ | 30,324 | ​ | ​ |
| TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY                                                                                                         | ​ | ​ | ​                 | $       | 147,331 | ​                 | ​ | ​ | ​ | $ | 131,311 | ​ | ​ |
| ​                                                                                                                                                  |

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| ​                                                        | ​ | ​ | For the Years Ended December 31, | ​ |
|----------------------------------------------------------------|---------|---------|----------------------------------|---------|
| (Dollars in thousands, except per share amount)                | ​ | ​ | 2017                             | ​ | ​ | 2016 | ​ |
| INTEREST INCOME:                                               | ​ | ​ | ​                          | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Interest and fees on loans                                     | ​ | ​ | ​                          | $       | 3,423 | ​ | ​ | ​ | ​ | $ | 3,735 | ​ | ​ |
| Interest on federal funds sold and other investments           | ​ | ​ | ​                          | ​ | 78 | ​ | ​ | ​ | ​ | ​ | 135 | ​ | ​ |
| Interest and dividends on investment securities                | ​ | ​ | ​                          | ​ | 882 | ​ | ​ | ​ | ​ | ​ | 672 | ​ | ​ |
| Total interest income                                          | ​ | ​ | ​                          | ​ | 4,383 | ​ | ​ | ​ | ​ | ​ | 4,542 | ​ | ​ |
| INTEREST EXPENSE:                                              | ​ | ​ | ​                          | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Interest on deposits                                           | ​ | ​ | ​                          | ​ | 816 | ​ | ​ | ​ | ​ | ​ | 769 | ​ | ​ |
| Interest on short-term borrowings                              | ​ | ​ | ​                          | ​ | 69 | ​ | ​ | ​ | ​ | ​ | 1 | ​ | ​ |
| Interest on long term borrowings                               | ​ | ​ | ​                          | ​ | 51 | ​ | ​ | ​ | ​ | ​ | 435 | ​ | ​ |
| Total interest expense                                         | ​ | ​ | ​                          | ​ | 936 | ​ | ​ | ​ | ​ | ​ | 1,205 | ​ | ​ |
| NET INTEREST INCOME                                            | ​ | ​ | ​                          | ​ | 3,447 | ​ | ​ | ​ | ​ | ​ | 3,337 | ​ | ​ |
| (REVERSAL) PROVISION FOR LOAN LOSSES                           | ​ | ​ | ​                          | ​ | — | ​ | ​ | ​ | ​ | ​ | (258) | ​ | ​ |
| NET INTEREST INCOME AFTER (REVERSAL) PROVISION FOR LOAN LOSSES | ​ | ​ | ​                          | ​ | 3,447 | ​ | ​ | ​ | ​ | ​ | 3,595 | ​ | ​ |
| NON-INTEREST INCOME:                                           | ​ | ​ | ​                          | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Service charges on deposit accounts                            | ​ | ​ | ​                          | ​ | 15 | ​ | ​ | ​ | ​ | ​ | 10 | ​ | ​ |
| Fees and charges on loans                                      | ​ | ​ | ​                          | ​ | 39 | ​ | ​ | ​ | ​ | ​ | 35 | ​ | ​ |
| Increase in cash surrender value of life insurance             | ​ | ​ | ​                          | ​ | 163 | ​ | ​ | ​ | ​ | ​ | 35 | ​ | ​ |
| Gain on investment securities                                  | ​ | ​ | ​                          | ​ | 57 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Loss on early extinguishment of debt                           | ​ | ​ | ​                          | ​ | — | ​ | ​ | ​ | ​ | ​ | (140) | ​ | ​ |
| Ground rent fees                                               | ​ | ​ | ​                          | ​ | 41 | ​ | ​ | ​ | ​ | ​ | 43 | ​ | ​ |
| Other income                                                   | ​ | ​ | ​                          | ​ | 44 | ​ | ​ | ​ | ​ | ​ | 56 | ​ | ​ |
| Total non-interest income                                      | ​ | ​ | ​                          | ​ | 359 | ​ | ​ | ​ | ​ | ​ | 39 | ​ | ​ |
| NON-INTEREST EXPENSE:                                          | ​ | ​ | ​                          | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Salaries and employee benefits                                 | ​ | ​ | ​                          | ​ | 2,115 | ​ | ​ | ​ | ​ | ​ | 2,811 | ​ | ​ |
| Occupancy expenses                                             | ​ | ​ | ​                          | ​ | 433 | ​ | ​ | ​ | ​ | ​ | 398 | ​ | ​ |
| Furniture and equipment expenses                               | ​ | ​ | ​                          | ​ | 41 | ​ | ​ | ​ | ​ | ​ | 42 | ​ | ​ |
| Legal and professional expenses                                | ​ | ​ | ​                          | ​ | 320 | ​ | ​ | ​ | ​ | ​ | 414 | ​ | ​ |
| Data processing and other outside services                     | ​ | ​ | ​                          | ​ | 322 | ​ | ​ | ​ | ​ | ​ | 292 | ​ | ​ |
| FDIC insurance premiums                                        | ​ | ​ | ​                          | ​ | 20 | ​ | ​ | ​ | ​ | ​ | 76 | ​ | ​ |
| Advertising and marketing related expenses                     | ​ | ​ | ​                          | ​ | 9 | ​ | ​ | ​ | ​ | ​ | 30 | ​ | ​ |
| Provision for loss on other real estate owned                  | ​ | ​ | ​                          | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Other expenses                                                 | ​ | ​ | ​                          | ​ | 473 | ​ | ​ | ​ | ​ | ​ | 551 | ​ | ​ |
| Total non-interest expenses                                    | ​ | ​ | ​                          | ​ | 3,733 | ​ | ​ | ​ | ​ | ​ | 4,614 | ​ | ​ |
| INCOME (LOSS) BEFORE INCOME TAXES                              | ​ | ​ | ​                          | ​ | 73 | ​ | ​ | ​ | ​ | ​ | (980) | ​ | ​ |
| INCOME TAX EXPENSE                                             | ​ | ​ | ​                          | ​ | — | ​ | ​ | ​ | ​ | ​ | 771 | ​ | ​ |
| NET INCOME (LOSS)                                              | ​ | ​ | ​                          | $       | 73 | ​ | ​ | ​ | ​ | $ | (1,751) | ​ | ​ |
| Basic earnings per share                                       | ​ | ​ | ​                          | $       | 0.04 | ​ | ​ | ​ | ​ | $ | (0.96) | ​ | ​ |
| Diluted earnings per share                                     | ​ | ​ | ​                          | $       | 0.04 | ​ | ​ | ​ | ​ | $ | (0.96) | ​ | ​ |
| ​                                                        |

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| ​                                                                        | ​ | ​ | For the Years Ended | ​ |
|--------------------------------------------------------------------------------|---------|---------|---------------------|---------|
| (Dollars in thousands)                                                         | ​ | ​ | December 31, 2017   | ​ | ​ | December 31, 2016 | ​ |
| NET INCOME (Loss)                                                              | ​ | ​ | ​             | $       | 73 | ​ | ​ | ​ | ​ | $ | (1,751) | ​ | ​ |
| OTHER COMPREHENSIVE INCOME (LOSS) ON AVAILABLE-FOR-SALE INVESTMENT SECURITIES: | ​ | ​ | ​             | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Unrealized gains (losses) during the period                                    | ​ | ​ | ​             | ​ | (90) | ​ | ​ | ​ | ​ | ​ | (128) | ​ | ​ |
| Reclassification of gain included in period                                    | ​ | ​ | ​             | ​ | (57) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Unrealized gains (losses) during the period                                    | ​ | ​ | ​             | ​ | (147) | ​ | ​ | ​ | ​ | ​ | (128) | ​ | ​ |
| Income taxes on unrealized gains (losses) during the period                    | ​ | ​ | ​             | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| ​                                                                        | ​ | ​ | ​             | ​ | (147) | ​ | ​ | ​ | ​ | ​ | (128) | ​ | ​ |
| COMPREHENSIVE Income (loss)                                                    | ​ | ​ | ​             | $       | (74) | ​ | ​ | ​ | ​ | $ | (1,879) | ​ | ​ |
| ​                                                                        |

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| (Dollars in thousands)                                                        | ​ | ​ | Common Stock | ​ | ​ | Additional Paid In Capital | ​ | ​ | Retained Earnings | ​ | ​ | Unearned ESOP Shares | ​ | ​ | Accumulated Other Comprehensive Income (Loss) | ​ | ​ | Total Stockholders’ Equity | ​ |
|-------------------------------------------------------------------------------|---------|---------|--------------|---------|---------|----------------------------|---------|---------|-------------------|---------|---------|----------------------|---------|---------|-----------------------------------------------|---------|---------|----------------------------------|---------|
| BALANCES AT JANUARY 1, 2016                                                   | ​ | ​ | ​      | $       | 21      | ​                    | ​ | ​ | ​           | $       | 20,158  | ​              | ​ | ​ | ​                                       | $       | 16,284  | ​                          | ​ | ​ | ​ | $ | (1,571) | ​ | ​ | ​ | ​ | $ | (11) | ​ | ​ | ​ | ​ | $ | 34,881 | ​ | ​ |
| Net loss                                                                      | ​ | ​ | ​      | ​ | — | ​                    | ​ | ​ | ​           | ​ | — | ​              | ​ | ​ | ​                                       | ​ | (1,751) | ​                          | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (1,751) | ​ | ​ |
| Net unrealized loss on available-for sale securities, net of tax of  $0 | ​ | ​ | ​      | ​ | — | ​                    | ​ | ​ | ​           | ​ | — | ​              | ​ | ​ | ​                                       | ​ | — | ​                          | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (128) | ​ | ​ | ​ | ​ | ​ | (128) | ​ | ​ |
| Stock-based compensation                                                      | ​ | ​ | ​      | ​ | — | ​                    | ​ | ​ | ​           | ​ | 26      | ​              | ​ | ​ | ​                                       | ​ | — | ​                          | ​ | ​ | ​ | ​ | 113 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 139 | ​ | ​ |
| Repurchase of shares                                                          | ​ | ​ | ​      | ​ | (2)     | ​                    | ​ | ​ | ​           | ​ | (2,052) | ​              | ​ | ​ | ​                                       | ​ | (763)   | ​                          | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (2,817) | ​ | ​ |
| BALANCES AT DECEMBER 31, 2016                                                 | ​ | ​ | ​      | $       | 19      | ​                    | ​ | ​ | ​           | $       | 18,132  | ​              | ​ | ​ | ​                                       | $       | 13,770  | ​                          | ​ | ​ | ​ | $ | (1,458) | ​ | ​ | ​ | ​ | $ | (139) | ​ | ​ | ​ | ​ | $ | 30,324 | ​ | ​ |
| BALANCES AT JANUARY 1, 2017                                                   | ​ | ​ | ​      | $       | 19      | ​                    | ​ | ​ | ​           | $       | 18,132  | ​              | ​ | ​ | ​                                       | $       | 13,770  | ​                          | ​ | ​ | ​ | $ | (1,458) | ​ | ​ | ​ | ​ | $ | (139) | ​ | ​ | ​ | ​ | $ | 30,324 | ​ | ​ |
| Net income                                                                    | ​ | ​ | ​      | ​ | — | ​                    | ​ | ​ | ​           | ​ | — | ​              | ​ | ​ | ​                                       | ​ | 73      | ​                          | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 73 | ​ | ​ |
| Net unrealized loss on available-for sale securities, net of tax of  $0 | ​ | ​ | ​      | ​ | — | ​                    | ​ | ​ | ​           | ​ | — | ​              | ​ | ​ | ​                                       | ​ | — | ​                          | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (90) | ​ | ​ | ​ | ​ | ​ | (90) | ​ | ​ |
| Stock-based compensation                                                      | ​ | ​ | ​      | ​ | — | ​                    | ​ | ​ | ​           | ​ | 124     | ​              | ​ | ​ | ​                                       | ​ | — | ​                          | ​ | ​ | ​ | ​ | 113 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 237 | ​ | ​ |
| Repurchase of shares                                                          | ​ | ​ | ​      | ​ | — | ​                    | ​ | ​ | ​           | ​ | (121)   | ​              | ​ | ​ | ​                                       | ​ | (63)    | ​                          | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (184) | ​ | ​ |
| BALANCES AT DECEMBER 31, 2017                                                 | ​ | ​ | ​      | $       | 19      | ​                    | ​ | ​ | ​           | $       | 18,135  | ​              | ​ | ​ | ​                                       | $       | 13,780  | ​                          | ​ | ​ | ​ | $ | (1,345) | ​ | ​ | ​ | ​ | $ | (229) | ​ | ​ | ​ | ​ | $ | 30,360 | ​ | ​ |
| ​                                                                       |

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| ​                                                                      | ​ | ​ | For the Years Ended | ​ |
|------------------------------------------------------------------------------|---------|---------|---------------------|---------|
| (Dollars in thousands)                                                       | ​ | ​ | December 31, 2017   | ​ | ​ | December 31, 2016 | ​ |
| CASH FLOWS FROM OPERATING ACTIVITIES:                                        | ​ | ​ | ​             | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Net income (loss)                                                            | ​ | ​ | ​             | $       | 73 | ​ | ​ | ​ | ​ | $ | (1,751) | ​ | ​ |
| Adjustment to reconcile net income to net cash used in operating activities: | ​ | ​ | ​             | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Depreciation expense                                                         | ​ | ​ | ​             | ​ | 132 | ​ | ​ | ​ | ​ | ​ | 133 | ​ | ​ |
| Increase in cash surrender value of life insurance                           | ​ | ​ | ​             | ​ | (143) | ​ | ​ | ​ | ​ | ​ | (35) | ​ | ​ |
| Net amortization/accretion of premiums and discounts                         | ​ | ​ | ​             | ​ | 69 | ​ | ​ | ​ | ​ | ​ | (40) | ​ | ​ |
| Provision for loan losses                                                    | ​ | ​ | ​             | ​ | — | ​ | ​ | ​ | ​ | ​ | (258) | ​ | ​ |
| Reversal for ground rent losses                                              | ​ | ​ | ​             | ​ | — | ​ | ​ | ​ | ​ | ​ | (8) | ​ | ​ |
| Deferred income tax benefits, net                                            | ​ | ​ | ​             | ​ | — | ​ | ​ | ​ | ​ | ​ | 786 | ​ | ​ |
| Non-cash compensation under stock-based benefit plan                         | ​ | ​ | ​             | ​ | 237 | ​ | ​ | ​ | ​ | ​ | 139 | ​ | ​ |
| Increase in accrued interest and other assets                                | ​ | ​ | ​             | ​ | (106) | ​ | ​ | ​ | ​ | ​ | (19) | ​ | ​ |
| Gain on sale of investment securities                                        | ​ | ​ | ​             | ​ | (57) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Loss on early extinguishment of debt                                         | ​ | ​ | ​             | ​ | — | ​ | ​ | ​ | ​ | ​ | 140 | ​ | ​ |
| Decrease in deferred compensation liability                                  | ​ | ​ | ​             | ​ | (11) | ​ | ​ | ​ | ​ | ​ | (76) | ​ | ​ |
| (Decrease) increase in accounts payable and other liabilities                | ​ | ​ | ​             | ​ | (298) | ​ | ​ | ​ | ​ | ​ | 432 | ​ | ​ |
| Net cash used in operating activities                                        | ​ | ​ | ​             | ​ | (104) | ​ | ​ | ​ | ​ | ​ | (557) | ​ | ​ |
| CASH FLOWS FROM INVESTING ACTIVITIES:                                        | ​ | ​ | ​             | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Net decrease (increase) in other interest bearing deposits in other banks    | ​ | ​ | ​             | ​ | 5,977 | ​ | ​ | ​ | ​ | ​ | 11,088 | ​ | ​ |
| Purchase of available-for-sale investments                                   | ​ | ​ | ​             | ​ | (15,971) | ​ | ​ | ​ | ​ | ​ | (2,499) | ​ | ​ |
| Proceeds from calls/repayments of available-for-sale investments             | ​ | ​ | ​             | ​ | 1,599 | ​ | ​ | ​ | ​ | ​ | 7,185 | ​ | ​ |
| Proceeds from sale of available for sale securities                          | ​ | ​ | ​             | ​ | 1,359 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Purchase of held-to-maturity investments                                     | ​ | ​ | ​             | ​ | (1,732) | ​ | ​ | ​ | ​ | ​ | (31,596) | ​ | ​ |
| Proceeds from maturity/repayments of held-to-maturity investments            | ​ | ​ | ​             | ​ | 3,144 | ​ | ​ | ​ | ​ | ​ | 21,938 | ​ | ​ |
| (Increase) decrease in loans, net                                            | ​ | ​ | ​             | ​ | (7,735) | ​ | ​ | ​ | ​ | ​ | 7,353 | ​ | ​ |
| Proceeds from sale of ground rents                                           | ​ | ​ | ​             | ​ | 7 | ​ | ​ | ​ | ​ | ​ | 15 | ​ | ​ |
| Purchase of bank-owned life insurance                                        | ​ | ​ | ​             | ​ | (3,500) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Purchase of property, plant and equipment                                    | ​ | ​ | ​             | ​ | (119) | ​ | ​ | ​ | ​ | ​ | (17) | ​ | ​ |
| Redemption of Federal Home Loan Bank stock                                   | ​ | ​ | ​             | ​ | (336) | ​ | ​ | ​ | ​ | ​ | 270 | ​ | ​ |
| Net cash provided by (used in) investing activities                          | ​ | ​ | ​             | ​ | (17,307) | ​ | ​ | ​ | ​ | ​ | 13,737 | ​ | ​ |
| CASH FLOWS FROM FINANCING ACTIVITIES:                                        | ​ | ​ | ​             | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Net increase in deposits                                                     | ​ | ​ | ​             | $       | 10,293 | ​ | ​ | ​ | ​ | $ | 323 | ​ | ​ |
| Federal Home Loan Bank advances                                              | ​ | ​ | ​             | ​ | 52,000 | ​ | ​ | ​ | ​ | ​ | 7,000 | ​ | ​ |
| Federal Home Loan Bank repayments                                            | ​ | ​ | ​             | ​ | (46,000) | ​ | ​ | ​ | ​ | ​ | (12,140) | ​ | ​ |
| Repurchase of common stock                                                   | ​ | ​ | ​             | ​ | (184) | ​ | ​ | ​ | ​ | ​ | (2,817) | ​ | ​ |
| Net cash used in financing activities                                        | ​ | ​ | ​             | ​ | 16,109 | ​ | ​ | ​ | ​ | ​ | (7,634) | ​ | ​ |
| INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS                             | ​ | ​ | ​             | ​ | (1,302) | ​ | ​ | ​ | ​ | ​ | 5,546 | ​ | ​ |
| CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR                               | ​ | ​ | ​             | ​ | 9,267 | ​ | ​ | ​ | ​ | ​ | 3,721 | ​ | ​ |
| CASH AND CASH EQUIVALENTS AT END OF YEAR                                     | ​ | ​ | ​             | $       | 7,965 | ​ | ​ | ​ | ​ | $ | 9,267 | ​ | ​ |
| Supplemental cash flow information:                                          | ​ | ​ | ​             | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Interest paid                                                                | ​ | ​ | ​             | $       | 922 | ​ | ​ | ​ | ​ | ​ | 1,267 | ​ | ​ |
| Income taxes paid                                                            | ​ | ​ | ​             | $       | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ |
| Noncash:                                                                     | ​ | ​ | ​             | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Transfer of other real estate owned to loans                                 | ​ | ​ | ​             | $       | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ |
| ​                                                                      |

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| ​                              | ​ | ​ | December 31, 2017 | ​ |
|--------------------------------------|---------|---------|-------------------|---------|
| (Dollars in thousands)               | ​ | ​ | Amortized Cost    | ​ | ​ | Gross Unrealized Gains | ​ | ​ | Gross Unrealized Losses | ​ | ​ | Estimated Fair Value | ​ |
| Investments available-for-sale:      | ​ | ​ | ​           | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| U.S. Government securities           | ​ | ​ | ​           | $       | 1,000 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | (55) | ​ | ​ | ​ | ​ | $ | 945 | ​ | ​ |
| Municipal Securities                 | ​ | ​ | ​           | ​ | 499 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (2) | ​ | ​ | ​ | ​ | ​ | 497 | ​ | ​ |
| Mortgage-backed securities           | ​ | ​ | ​           | ​ | 15,334 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (171) | ​ | ​ | ​ | ​ | ​ | 15,163 | ​ | ​ |
| Total investments available-for-sale | ​ | ​ | ​           | $       | 16,833 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | (228) | ​ | ​ | ​ | ​ | $ | 16,605 | ​ | ​ |
| ​                              |
| ​                              | ​ | ​ | December 31, 2016 | ​ |
|--------------------------------------|---------|---------|-------------------|---------|
| (Dollars in thousands)               | ​ | ​ | Amortized Cost    | ​ | ​ | Gross Unrealized Gains | ​ | ​ | Gross Unrealized Losses | ​ | ​ | Estimated Fair Value | ​ |
| Investments available-for-sale:      | ​ | ​ | ​           | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| U.S. Government securities           | ​ | ​ | ​           | $       | 1,000 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | (67) | ​ | ​ | ​ | ​ | $ | 933 | ​ | ​ |
| Mortgage-backed securities           | ​ | ​ | ​           | $       | 2,837 | ​ | ​ | ​ | ​ | ​ | 10 | ​ | ​ | ​ | ​ | ​ | (82) | ​ | ​ | ​ | ​ | ​ | 2,765 | ​ | ​ |
| Total investments available-for-sale | ​ | ​ | ​           | $       | 3,837 | ​ | ​ | ​ | ​ | $ | 10 | ​ | ​ | ​ | ​ | $ | (149) | ​ | ​ | ​ | ​ | $ | 3,698 | ​ | ​ |
| ​                              |
| ​                            | ​ | ​ | December 31, 2017 | ​ |
|------------------------------------|---------|---------|-------------------|---------|
| (Dollars in thousands)             | ​ | ​ | Amortized Cost    | ​ | ​ | Gross Unrealized Gains | ​ | ​ | Gross Unrealized Losses | ​ | ​ | Estimated Fair Value | ​ |
| Investments held-to-maturity:      | ​ | ​ | ​           | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| U.S. Government securities         | ​ | ​ | ​           | $       | 12,500 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | (424) | ​ | ​ | ​ | ​ | $ | 12,076 | ​ | ​ |
| Mortgage backed securities         | ​ | ​ | ​           | ​ | 4,910 | ​ | ​ | ​ | ​ | ​ | 106 | ​ | ​ | ​ | ​ | ​ | (84) | ​ | ​ | ​ | ​ | ​ | 4,932 | ​ | ​ |
| Total investments held-to-maturity | ​ | ​ | ​           | $       | 17,410 | ​ | ​ | ​ | ​ | $ | 106 | ​ | ​ | ​ | ​ | $ | (508) | ​ | ​ | ​ | ​ | $ | 17,008 | ​ | ​ |
| ​                            |
| ​                            | ​ | ​ | December 31, 2016 | ​ |
|------------------------------------|---------|---------|-------------------|---------|
| (Dollars in thousands)             | ​ | ​ | Amortized Cost    | ​ | ​ | Gross Unrealized Gains | ​ | ​ | Gross Unrealized Losses | ​ | ​ | Estimated Fair Value | ​ |
| Investments held-to-maturity:      | ​ | ​ | ​           | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| U.S. Government securities         | ​ | ​ | ​           | $       | 12,500 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | (612) | ​ | ​ | ​ | ​ | $ | 11,888 | ​ | ​ |
| Mortgage backed securities         | ​ | ​ | ​           | ​ | 6,318 | ​ | ​ | ​ | ​ | ​ | 183 | ​ | ​ | ​ | ​ | ​ | (118) | ​ | ​ | ​ | ​ | ​ | 6,383 | ​ | ​ |
| Total investments held-to-maturity | ​ | ​ | ​           | $       | 18,818 | ​ | ​ | ​ | ​ | $ | 183 | ​ | ​ | ​ | ​ | $ | (730) | ​ | ​ | ​ | ​ | $ | 18,271 | ​ | ​ |
| ​                            |

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| ​                               | ​ | ​ | December 31, 2017   | ​ |
|---------------------------------------|---------|---------|---------------------|---------|
| ​                               | ​ | ​ | Less than 12 Months | ​ | ​ | 12 Months or More | ​ | ​ | Total | ​ |
| (Dollars in thousands)                | ​ | ​ | Fair Value          | ​ | ​ | Unrealized Losses | ​ | ​ | Fair Value | ​ | ​ | Unrealized Losses | ​ | ​ | Fair Value | ​ | ​ | Unrealized Losses | ​ |
| Mortgage-backed securities            | ​ | ​ | ​             | $       | 13,443 | ​ | ​ | ​ | ​ | $ | (117) | ​ | ​ | ​ | ​ | $ | 4,499 | ​ | ​ | ​ | ​ | $ | (138) | ​ | ​ | ​ | ​ | $ | 17,942 | ​ | ​ | ​ | ​ | $ | (255) | ​ | ​ |
| Municipal Securities                  | ​ | ​ | ​             | ​ | 497 | ​ | ​ | ​ | ​ | ​ | (2) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 497 | ​ | ​ | ​ | ​ | ​ | (2) | ​ | ​ |
| U.S. Government securities            | ​ | ​ | ​             | ​ | 987 | ​ | ​ | ​ | ​ | ​ | (13) | ​ | ​ | ​ | ​ | ​ | 12,034 | ​ | ​ | ​ | ​ | ​ | (466) | ​ | ​ | ​ | ​ | ​ | 13,021 | ​ | ​ | ​ | ​ | ​ | (479) | ​ | ​ |
| Total temporarily impaired securities | ​ | ​ | ​             | $       | 14,927 | ​ | ​ | ​ | ​ | $ | (132) | ​ | ​ | ​ | ​ | $ | 16,533 | ​ | ​ | ​ | ​ | $ | (604) | ​ | ​ | ​ | ​ | $ | 31,460 | ​ | ​ | ​ | ​ | $ | (736) | ​ | ​ |
| ​                               |
| ​                               | ​ | ​ | December 31, 2016   | ​ |
|---------------------------------------|---------|---------|---------------------|---------|
| ​                               | ​ | ​ | Less than 12 Months | ​ | ​ | 12 Months or More | ​ | ​ | Total | ​ |
| (Dollars in thousands)                | ​ | ​ | Fair Value          | ​ | ​ | Unrealized Losses | ​ | ​ | Fair Value | ​ | ​ | Unrealized Losses | ​ | ​ | Fair Value | ​ | ​ | Unrealized Losses | ​ |
| Mortgage-backed securities            | ​ | ​ | ​             | $       | 5,369 | ​ | ​ | ​ | ​ | $ | (200) | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 5,369 | ​ | ​ | ​ | ​ | $ | (200) | ​ | ​ |
| Government securities                 | ​ | ​ | ​             | ​ | 12,821 | ​ | ​ | ​ | ​ | ​ | (679) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 12,821 | ​ | ​ | ​ | ​ | ​ | (679) | ​ | ​ |
| Total temporarily impaired securities | ​ | ​ | ​             | $       | 18,190 | ​ | ​ | ​ | ​ | $ | (879) | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 18,190 | ​ | ​ | ​ | ​ | $ | (879) | ​ | ​ |
| ​                               |
| ​                               | ​ | ​ | Amortized Cost | ​ | ​ | Fair Value     | ​ |
|---------------------------------------|---------|---------|----------------|---------|---------|----------------|---------|
| ​                               | ​ | ​ | (in thousands) | ​ | ​ | (in thousands) | ​ |
| Due over one year through five years  | ​ | ​ | ​        | $       | 1,000   | ​        | ​ | ​ | ​ | $ | 987 | ​ | ​ |
| Due over five years through ten years | ​ | ​ | ​        | ​ | 4,000   | ​        | ​ | ​ | ​ | ​ | 3,875 | ​ | ​ |
| Due after ten years                   | ​ | ​ | ​        | ​ | 8,999   | ​        | ​ | ​ | ​ | ​ | 8,656 | ​ | ​ |
| Mortgage-backed securities            | ​ | ​ | ​        | ​ | 20,244  | ​        | ​ | ​ | ​ | ​ | 20,095 | ​ | ​ |
| Total                                 | ​ | ​ | ​        | $       | 34,243  | ​        | ​ | ​ | ​ | $ | 33,613 | ​ | ​ |
| ​                               |

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| (Dollars in thousands)                                | ​ | ​ | December 31, 2017 | ​ | ​ | December 31, 2016 | ​ |
|-------------------------------------------------------|---------|---------|-------------------|---------|---------|-------------------|---------|
| Secured by real estate:                               | ​ | ​ | ​           | ​ | ​ | ​           | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Residential:                                          | ​ | ​ | ​           | ​ | ​ | ​           | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| One-to four-family                                    | ​ | ​ | ​           | $       | 74,266  | ​           | ​ | ​ | ​ | $ | 71,266 | ​ | ​ |
| Multi-family                                          | ​ | ​ | ​           | ​ | 1,243   | ​           | ​ | ​ | ​ | ​ | 2,038 | ​ | ​ |
| Total                                                 | ​ | ​ | ​           | ​ | 75,509  | ​           | ​ | ​ | ​ | ​ | 73,304 | ​ | ​ |
| Non-residential                                       | ​ | ​ | ​           | ​ | 13,183  | ​           | ​ | ​ | ​ | ​ | 7,021 | ​ | ​ |
| Construction and land loans                           | ​ | ​ | ​           | ​ | 3,240   | ​           | ​ | ​ | ​ | ​ | 5,104 | ​ | ​ |
| Home equity line of credit (“HELOC”)      | ​ | ​ | ​           | ​ | 3,471   | ​           | ​ | ​ | ​ | ​ | 3,473 | ​ | ​ |
| Consumer and other loans:                             | ​ | ​ | ​           | ​ | ​ | ​           | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Loans to depositors, secured by savings, &C&I | ​ | ​ | ​           | ​ | 424     | ​           | ​ | ​ | ​ | ​ | 18 | ​ | ​ |
| ​                                               | ​ | ​ | ​           | ​ | 95,827  | ​           | ​ | ​ | ​ | ​ | 88,920 | ​ | ​ |
| Add:                                                  | ​ | ​ | ​           | ​ | ​ | ​           | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Net discount on purchased loans                       | ​ | ​ | ​           | ​ | 1       | ​           | ​ | ​ | ​ | ​ | 10 | ​ | ​ |
| Unamortized net deferred costs                        | ​ | ​ | ​           | ​ | 41      | ​           | ​ | ​ | ​ | ​ | 16 | ​ | ​ |
| Less:                                                 | ​ | ​ | ​           | ​ | ​ | ​           | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Undisbursed portion of construction loans             | ​ | ​ | ​           | ​ | (741)   | ​           | ​ | ​ | ​ | ​ | (1,650) | ​ | ​ |
| Unearned net loan origination fees                    | ​ | ​ | ​           | ​ | (75)    | ​           | ​ | ​ | ​ | ​ | (48) | ​ | ​ |
| Less allowance for loan losses                        | ​ | ​ | ​           | ​ | (1,288) | ​           | ​ | ​ | ​ | ​ | (1,218) | ​ | ​ |
| Loans receivable, net                                 | ​ | ​ | ​           | $       | 93,765  | ​           | ​ | ​ | ​ | $ | 86,030 | ​ | ​ |
| ​                                               |

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| (Dollars in thousands)                                                           | ​ | ​ | Residential Real Estate, HELOC, and Consumer | ​ | ​ | Non-residential Real Estate | ​ | ​ | Construction and Land | ​ | ​ | Unallocated | ​ | ​ | Total   | ​ |
|----------------------------------------------------------------------------------|---------|---------|----------------------------------------------|---------|---------|-----------------------------|---------|---------|-----------------------|---------|---------|-------------|---------|---------|---------|---------|
| Allowance for loan losses:                                                       | ​ | ​ | ​                                      | ​ | ​ | ​                     | ​ | ​ | ​               | ​ | ​ | ​     | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Beginning balance                                                                | ​ | ​ | ​                                      | $       | 973     | ​                     | ​ | ​ | ​               | $       | 158     | ​     | ​ | ​ | ​ | $       | 87 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 1,218 | ​ | ​ |
| Charge-offs                                                                      | ​ | ​ | ​                                      | ​ | (85)    | ​                     | ​ | ​ | ​               | ​ | (81)    | ​     | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (166) | ​ | ​ |
| Recoveries                                                                       | ​ | ​ | ​                                      | ​ | 105     | ​                     | ​ | ​ | ​               | ​ | — | ​     | ​ | ​ | ​ | ​ | 131 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 236 | ​ | ​ |
| Provisions (Reversal)                                                            | ​ | ​ | ​                                      | ​ | 50      | ​                     | ​ | ​ | ​               | ​ | 81      | ​     | ​ | ​ | ​ | ​ | (131) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Ending balance                                                                   | ​ | ​ | ​                                      | $       | 1,043   | ​                     | ​ | ​ | ​               | $       | 158     | ​     | ​ | ​ | ​ | $       | 87 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 1,288 | ​ | ​ |
| Allowance for loan losses: Ending balance: individually evaluated for impairment | ​ | ​ | ​                                      | $       | 30      | ​                     | ​ | ​ | ​               | $       | — | ​     | ​ | ​ | ​ | $       | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 30 | ​ | ​ |
| Ending balance: collectively evaluated for impairment                            | ​ | ​ | ​                                      | $       | 1,013   | ​                     | ​ | ​ | ​               | $       | 158     | ​     | ​ | ​ | ​ | $       | 87 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 1,258 | ​ | ​ |
| Loans:                                                                           | ​ | ​ | ​                                      | ​ | ​ | ​                     | ​ | ​ | ​               | ​ | ​ | ​     | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Ending balance: individually evaluated for impairment                            | ​ | ​ | ​                                      | $       | 2,179   | ​                     | ​ | ​ | ​               | $       | 1,154   | ​     | ​ | ​ | ​ | $       | 1,094 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 4,427 | ​ | ​ |
| Ending balance: collectively evaluated for impairment                            | ​ | ​ | ​                                      | $       | 77,225  | ​                     | ​ | ​ | ​               | $       | 12,029  | ​     | ​ | ​ | ​ | $       | 2,146 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 91,400 | ​ | ​ |
| ​                                                                          |
| (Dollars in thousands)                                                           | ​ | ​ | Residential Real Estate, HELOC, and Consumer | ​ | ​ | Non-residential Real Estate | ​ | ​ | Construction and Land | ​ | ​ | Unallocated | ​ | ​ | Total   | ​ |
|----------------------------------------------------------------------------------|---------|---------|----------------------------------------------|---------|---------|-----------------------------|---------|---------|-----------------------|---------|---------|-------------|---------|---------|---------|---------|
| Allowance for loan losses:                                                       | ​ | ​ | ​                                      | ​ | ​ | ​                     | ​ | ​ | ​               | ​ | ​ | ​     | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Beginning balance                                                                | ​ | ​ | ​                                      | $       | 960     | ​                     | ​ | ​ | ​               | $       | 194     | ​     | ​ | ​ | ​ | $       | 157 | ​ | ​ | ​ | ​ | $ | 250 | ​ | ​ | ​ | ​ | $ | 1,561 | ​ | ​ |
| Charge-offs                                                                      | ​ | ​ | ​                                      | ​ | (4)     | ​                     | ​ | ​ | ​               | ​ | — | ​     | ​ | ​ | ​ | ​ | (81) | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | (85) | ​ | ​ |
| Recoveries                                                                       | ​ | ​ | ​                                      | ​ | — | ​                     | ​ | ​ | ​               | ​ | — | ​     | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Provisions (Reversal)                                                            | ​ | ​ | ​                                      | ​ | 17      | ​                     | ​ | ​ | ​               | ​ | (36)    | ​     | ​ | ​ | ​ | ​ | 11 | ​ | ​ | ​ | ​ | ​ | (250) | ​ | ​ | ​ | ​ | ​ | (258) | ​ | ​ |
| Ending balance                                                                   | ​ | ​ | ​                                      | $       | 973     | ​                     | ​ | ​ | ​               | $       | 158     | ​     | ​ | ​ | ​ | $       | 87 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 1,218 | ​ | ​ |
| Allowance for loan losses: Ending balance: individually evaluated for impairment | ​ | ​ | ​                                      | $       | 38      | ​                     | ​ | ​ | ​               | $       | — | ​     | ​ | ​ | ​ | $       | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 38 | ​ | ​ |
| Ending balance: collectively evaluated for impairment                            | ​ | ​ | ​                                      | $       | 935     | ​                     | ​ | ​ | ​               | $       | 158     | ​     | ​ | ​ | ​ | $       | 87 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 1,180 | ​ | ​ |
| Loans:                                                                           | ​ | ​ | ​                                      | ​ | ​ | ​                     | ​ | ​ | ​               | ​ | ​ | ​     | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Ending balance: individually evaluated for impairment                            | ​ | ​ | ​                                      | $       | 3,772   | ​                     | ​ | ​ | ​               | $       | 1,451   | ​     | ​ | ​ | ​ | $       | 2,346 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 7,569 | ​ | ​ |
| Ending balance: collectively evaluated for impairment                            | ​ | ​ | ​                                      | $       | 73,023  | ​                     | ​ | ​ | ​               | $       | 5,570   | ​     | ​ | ​ | ​ | $       | 2,758 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 81,351 | ​ | ​ |
| ​                                                                          |

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| (Dollars in thousands) | ​ | ​ | Residential Real Estate, HELOC, and Consumer | ​ | ​ | Non-residential Real Estate | ​ | ​ | Construction and Land | ​ | ​ | Total   | ​ |
|------------------------|---------|---------|----------------------------------------------|---------|---------|-----------------------------|---------|---------|-----------------------|---------|---------|---------|---------|
| Non-classified         | ​ | ​ | ​                                      | $       | 74,808  | ​                     | ​ | ​ | ​               | $       | 11,181  | ​ | ​ | ​ | ​ | $ | 1,910 | ​ | ​ | ​ | ​ | $ | 87,899 | ​ | ​ |
| Special mention        | ​ | ​ | ​                                      | ​ | 2,060   | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | 236 | ​ | ​ | ​ | ​ | ​ | 2,296 | ​ | ​ |
| Substandard            | ​ | ​ | ​                                      | ​ | 2,536   | ​                     | ​ | ​ | ​               | ​ | 2,002   | ​ | ​ | ​ | ​ | ​ | 1,094 | ​ | ​ | ​ | ​ | ​ | 5,632 | ​ | ​ |
| Doubtful               | ​ | ​ | ​                                      | ​ | — | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Loss                   | ​ | ​ | ​                                      | ​ | — | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Total                  | ​ | ​ | ​                                      | $       | 79,404  | ​                     | ​ | ​ | ​               | $       | 13,183  | ​ | ​ | ​ | ​ | $ | 3,240 | ​ | ​ | ​ | ​ | $ | 95,827 | ​ | ​ |
| ​                |
| (Dollars in thousands) | ​ | ​ | Residential Real Estate, HELOC, and Consumer | ​ | ​ | Non-residential Real Estate | ​ | ​ | Construction and Land | ​ | ​ | Total   | ​ |
|------------------------|---------|---------|----------------------------------------------|---------|---------|-----------------------------|---------|---------|-----------------------|---------|---------|---------|---------|
| Non-classified         | ​ | ​ | ​                                      | $       | 71,147  | ​                     | ​ | ​ | ​               | $       | 5,653   | ​ | ​ | ​ | ​ | $ | 2,791 | ​ | ​ | ​ | ​ | $ | 79,591 | ​ | ​ |
| Special mention        | ​ | ​ | ​                                      | ​ | 3,005   | ​                     | ​ | ​ | ​               | ​ | 159     | ​ | ​ | ​ | ​ | ​ | 87 | ​ | ​ | ​ | ​ | ​ | 3,251 | ​ | ​ |
| Substandard            | ​ | ​ | ​                                      | ​ | 2,643   | ​                     | ​ | ​ | ​               | ​ | 1,209   | ​ | ​ | ​ | ​ | ​ | 2,226 | ​ | ​ | ​ | ​ | ​ | 6,078 | ​ | ​ |
| Doubtful               | ​ | ​ | ​                                      | ​ | — | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Loss                   | ​ | ​ | ​                                      | ​ | — | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Total                  | ​ | ​ | ​                                      | $       | 76,795  | ​                     | ​ | ​ | ​               | $       | 7,021   | ​ | ​ | ​ | ​ | $ | 5,104 | ​ | ​ | ​ | ​ | $ | 88,920 | ​ | ​ |
| ​                |

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| (Dollars in thousands)                                                     | ​ | ​ | Residential Real Estate, HELOC, and Consumer | ​ | ​ | Non-residential Real Estate | ​ | ​ | Construction and Land | ​ | ​ | Total   | ​ |
|----------------------------------------------------------------------------|---------|---------|----------------------------------------------|---------|---------|-----------------------------|---------|---------|-----------------------|---------|---------|---------|---------|
| With no related allowance recorded:                                        | ​ | ​ | ​                                      | ​ | ​ | ​                     | ​ | ​ | ​               | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Recorded investment                                                        | ​ | ​ | ​                                      | $       | 1,823   | ​                     | ​ | ​ | ​               | $       | 1,154   | ​ | ​ | ​ | ​ | $ | 1,094 | ​ | ​ | ​ | ​ | $ | 4,071 | ​ | ​ |
| Unpaid principal balance                                                   | ​ | ​ | ​                                      | ​ | 2,421   | ​                     | ​ | ​ | ​               | ​ | 2,026   | ​ | ​ | ​ | ​ | ​ | 2,137 | ​ | ​ | ​ | ​ | ​ | 6,584 | ​ | ​ |
| Average recorded investment, for the twelve months ended December 31, 2017 | ​ | ​ | ​                                      | ​ | 2,511   | ​                     | ​ | ​ | ​               | ​ | 1,468   | ​ | ​ | ​ | ​ | ​ | 1,310 | ​ | ​ | ​ | ​ | ​ | 5,289 | ​ | ​ |
| Interest income recognized                                                 | ​ | ​ | ​                                      | ​ | 179     | ​                     | ​ | ​ | ​               | ​ | 92      | ​ | ​ | ​ | ​ | ​ | 41 | ​ | ​ | ​ | ​ | ​ | 312 | ​ | ​ |
| Interest income foregone                                                   | ​ | ​ | ​                                      | ​ | 8       | ​                     | ​ | ​ | ​               | ​ | 4       | ​ | ​ | ​ | ​ | ​ | 53 | ​ | ​ | ​ | ​ | ​ | 65 | ​ | ​ |
| With an allowance recorded:                                                | ​ | ​ | ​                                      | ​ | ​ | ​                     | ​ | ​ | ​               | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Recorded investment                                                        | ​ | ​ | ​                                      | ​ | 356     | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 356 | ​ | ​ |
| Unpaid principal balance                                                   | ​ | ​ | ​                                      | ​ | 357     | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 357 | ​ | ​ |
| Related allowance                                                          | ​ | ​ | ​                                      | ​ | 30      | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 30 | ​ | ​ |
| Average recorded investment, for the twelve months ended December 31, 2017 | ​ | ​ | ​                                      | ​ | 354     | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 354 | ​ | ​ |
| Interest income recognized                                                 | ​ | ​ | ​                                      | ​ | 57      | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 57 | ​ | ​ |
| Interest income foregone                                                   | ​ | ​ | ​                                      | ​ | — | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Total                                                                      | ​ | ​ | ​                                      | ​ | ​ | ​                     | ​ | ​ | ​               | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Recorded investment                                                        | ​ | ​ | ​                                      | ​ | 2,179   | ​                     | ​ | ​ | ​               | ​ | 1,154   | ​ | ​ | ​ | ​ | ​ | 1,094 | ​ | ​ | ​ | ​ | ​ | 4,427 | ​ | ​ |
| Unpaid principal balance                                                   | ​ | ​ | ​                                      | ​ | 2,778   | ​                     | ​ | ​ | ​               | ​ | 2,026   | ​ | ​ | ​ | ​ | ​ | 2,137 | ​ | ​ | ​ | ​ | ​ | 6,941 | ​ | ​ |
| Related allowance                                                          | ​ | ​ | ​                                      | ​ | 30      | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 30 | ​ | ​ |
| Average recorded investment, for the twelve months ended December 31, 2017 | ​ | ​ | ​                                      | ​ | 2,865   | ​                     | ​ | ​ | ​               | ​ | 1,468   | ​ | ​ | ​ | ​ | ​ | 1,310 | ​ | ​ | ​ | ​ | ​ | 5,643 | ​ | ​ |
| Interest income recognized                                                 | ​ | ​ | ​                                      | ​ | 236     | ​                     | ​ | ​ | ​               | ​ | 92      | ​ | ​ | ​ | ​ | ​ | 41 | ​ | ​ | ​ | ​ | ​ | 369 | ​ | ​ |
| Interest income foregone                                                   | ​ | ​ | ​                                      | ​ | 8       | ​                     | ​ | ​ | ​               | ​ | 4       | ​ | ​ | ​ | ​ | ​ | 53 | ​ | ​ | ​ | ​ | ​ | 65 | ​ | ​ |

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| (Dollars in thousands)                                                     | ​ | ​ | Residential Real Estate, HELOC, and Consumer | ​ | ​ | Non-residential Real Estate | ​ | ​ | Construction and Land | ​ | ​ | Total   | ​ |
|----------------------------------------------------------------------------|---------|---------|----------------------------------------------|---------|---------|-----------------------------|---------|---------|-----------------------|---------|---------|---------|---------|
| With no related allowance recorded:                                        | ​ | ​ | ​                                      | ​ | ​ | ​                     | ​ | ​ | ​               | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Recorded investment                                                        | ​ | ​ | ​                                      | $       | 2,633   | ​                     | ​ | ​ | ​               | $       | 1,451   | ​ | ​ | ​ | ​ | $ | 2,346 | ​ | ​ | ​ | ​ | $ | 6,430 | ​ | ​ |
| Unpaid principal balance                                                   | ​ | ​ | ​                                      | ​ | 2,971   | ​                     | ​ | ​ | ​               | ​ | 1,665   | ​ | ​ | ​ | ​ | ​ | 3,512 | ​ | ​ | ​ | ​ | ​ | 8,148 | ​ | ​ |
| Average recorded investment, for the twelve months ended December 31, 2016 | ​ | ​ | ​                                      | ​ | 2,522   | ​                     | ​ | ​ | ​               | ​ | 1,353   | ​ | ​ | ​ | ​ | ​ | 2,309 | ​ | ​ | ​ | ​ | ​ | 6,184 | ​ | ​ |
| Interest income recognized                                                 | ​ | ​ | ​                                      | ​ | 166     | ​                     | ​ | ​ | ​               | ​ | 45      | ​ | ​ | ​ | ​ | ​ | 122 | ​ | ​ | ​ | ​ | ​ | 333 | ​ | ​ |
| Interest income foregone                                                   | ​ | ​ | ​                                      | ​ | 11      | ​                     | ​ | ​ | ​               | ​ | 18      | ​ | ​ | ​ | ​ | ​ | 7 | ​ | ​ | ​ | ​ | ​ | 36 | ​ | ​ |
| With an allowance recorded:                                                | ​ | ​ | ​                                      | ​ | ​ | ​                     | ​ | ​ | ​               | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Recorded investment                                                        | ​ | ​ | ​                                      | ​ | 1,139   | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 1,139 | ​ | ​ |
| Unpaid principal balance                                                   | ​ | ​ | ​                                      | ​ | 1,140   | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 1,140 | ​ | ​ |
| Related allowance                                                          | ​ | ​ | ​                                      | ​ | 38      | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 38 | ​ | ​ |
| Average recorded investment, for the twelve months ended December 31, 2016 | ​ | ​ | ​                                      | ​ | 1,151   | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 1,151 | ​ | ​ |
| Interest income recognized                                                 | ​ | ​ | ​                                      | ​ | 792     | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 792 | ​ | ​ |
| Interest income foregone                                                   | ​ | ​ | ​                                      | ​ | 50      | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 50 | ​ | ​ |
| Total                                                                      | ​ | ​ | ​                                      | ​ | ​ | ​                     | ​ | ​ | ​               | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Recorded investment                                                        | ​ | ​ | ​                                      | ​ | 3,772   | ​                     | ​ | ​ | ​               | ​ | 1,451   | ​ | ​ | ​ | ​ | ​ | 2,346 | ​ | ​ | ​ | ​ | ​ | 7,569 | ​ | ​ |
| Unpaid principal balance                                                   | ​ | ​ | ​                                      | ​ | 4,111   | ​                     | ​ | ​ | ​               | ​ | 1,665   | ​ | ​ | ​ | ​ | ​ | 3,512 | ​ | ​ | ​ | ​ | ​ | 9,288 | ​ | ​ |
| Related allowance                                                          | ​ | ​ | ​                                      | ​ | 38      | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 38 | ​ | ​ |
| Average recorded investment, for the twelve months ended December 31, 2016 | ​ | ​ | ​                                      | ​ | 3,673   | ​                     | ​ | ​ | ​               | ​ | 1,353   | ​ | ​ | ​ | ​ | ​ | 2,309 | ​ | ​ | ​ | ​ | ​ | 7,335 | ​ | ​ |
| Interest income recognized                                                 | ​ | ​ | ​                                      | ​ | 958     | ​                     | ​ | ​ | ​               | ​ | 45      | ​ | ​ | ​ | ​ | ​ | 122 | ​ | ​ | ​ | ​ | ​ | 1,125 | ​ | ​ |
| Interest income foregone                                                   | ​ | ​ | ​                                      | ​ | 61      | ​                     | ​ | ​ | ​               | ​ | 18      | ​ | ​ | ​ | ​ | ​ | 7 | ​ | ​ | ​ | ​ | ​ | 86 | ​ | ​ |
| (Dollars in thousands)                          | ​ | ​ | Residential Real Estate, HELOC, C&I, and Consumer | ​ | ​ | Non-residential Real Estate | ​ | ​ | Construction and Land | ​ | ​ | Total   | ​ |
|-------------------------------------------------|---------|---------|-------------------------------------------------------|---------|---------|-----------------------------|---------|---------|-----------------------|---------|---------|---------|---------|
| Current                                         | ​ | ​ | ​                                               | $       | 78,710  | ​                     | ​ | ​ | ​               | $       | 13,183  | ​ | ​ | ​ | ​ | $ | 2,609 | ​ | ​ | ​ | ​ | $ | 94,502 | ​ | ​ |
| 30 – 59 days past due         | ​ | ​ | ​                                               | ​ | 115     | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 115 | ​ | ​ |
| 60 – 89 days past due         | ​ | ​ | ​                                               | ​ | — | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Greater than 90 day past due and still accruing | ​ | ​ | ​                                               | ​ | 341     | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 341 | ​ | ​ |
| Greater than 90 days past due                   | ​ | ​ | ​                                               | ​ | 238     | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | 631 | ​ | ​ | ​ | ​ | ​ | 869 | ​ | ​ |
| Total past due                                  | ​ | ​ | ​                                               | ​ | 694     | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | 631 | ​ | ​ | ​ | ​ | ​ | 1,325 | ​ | ​ |
| Total                                           | ​ | ​ | ​                                               | $       | 79,404  | ​                     | ​ | ​ | ​               | $       | 13,183  | ​ | ​ | ​ | ​ | $ | 3,240 | ​ | ​ | ​ | ​ | $ | 95,827 | ​ | ​ |
| ​                                         |

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| (Dollars in thousands)                          | ​ | ​ | Residential Real Estate, HELOC, and Consumer | ​ | ​ | Non-residential Real Estate | ​ | ​ | Construction and Land | ​ | ​ | Total   | ​ |
|-------------------------------------------------|---------|---------|----------------------------------------------|---------|---------|-----------------------------|---------|---------|-----------------------|---------|---------|---------|---------|
| Current                                         | ​ | ​ | ​                                      | $       | 74,773  | ​                     | ​ | ​ | ​               | $       | 6,912   | ​ | ​ | ​ | ​ | $ | 3,312 | ​ | ​ | ​ | ​ | $ | 84,997 | ​ | ​ |
| 30 – 59 days past due         | ​ | ​ | ​                                      | ​ | 908     | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | 1,792 | ​ | ​ | ​ | ​ | ​ | 2,700 | ​ | ​ |
| 60 – 89 days past due         | ​ | ​ | ​                                      | ​ | 433     | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 433 | ​ | ​ |
| Greater than 90 day past due and still accruing | ​ | ​ | ​                                      | ​ | — | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Greater than 90 days past due                   | ​ | ​ | ​                                      | ​ | 681     | ​                     | ​ | ​ | ​               | ​ | 109     | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 790 | ​ | ​ |
| Total past due                                  | ​ | ​ | ​                                      | ​ | 2,022   | ​                     | ​ | ​ | ​               | ​ | 109     | ​ | ​ | ​ | ​ | ​ | 1,792 | ​ | ​ | ​ | ​ | ​ | 3,923 | ​ | ​ |
| Total                                           | ​ | ​ | ​                                      | $       | 76,795  | ​                     | ​ | ​ | ​               | $       | 7,021   | ​ | ​ | ​ | ​ | $ | 5,104 | ​ | ​ | ​ | ​ | $ | 88,920 | ​ | ​ |
| ​                                         |
| (Dollars in thousands)                        | ​ | ​ | Residential Real Estate, HELOC, and Consumer | ​ | ​ | Non-residential Real Estate | ​ | ​ | Construction and Land | ​ | ​ | Total   | ​ |
|-----------------------------------------------|---------|---------|----------------------------------------------|---------|---------|-----------------------------|---------|---------|-----------------------|---------|---------|---------|---------|
| Non-accruing troubled debt restructured loans | ​ | ​ | ​                                      | $       | 427     | ​                     | ​ | ​ | ​               | $       | — | ​ | ​ | ​ | ​ | $ | 649 | ​ | ​ | ​ | ​ | $ | 1,076 | ​ | ​ |
| Other non-accrual loans                       | ​ | ​ | ​                                      | ​ | 430     | ​                     | ​ | ​ | ​               | ​ | 74      | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 504 | ​ | ​ |
| Total non-accrual loans                       | ​ | ​ | ​                                      | ​ | 857     | ​                     | ​ | ​ | ​               | ​ | 74      | ​ | ​ | ​ | ​ | ​ | 649 | ​ | ​ | ​ | ​ | ​ | 1,580 | ​ | ​ |
| Accruing troubled debt restructured loans     | ​ | ​ | ​                                      | ​ | 1,059   | ​                     | ​ | ​ | ​               | ​ | 1,153   | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 2,212 | ​ | ​ |
| Total                                         | ​ | ​ | ​                                      | $       | 1,916   | ​                     | ​ | ​ | ​               | $       | 1,227   | ​ | ​ | ​ | ​ | $ | 649 | ​ | ​ | ​ | ​ | $ | 3,792 | ​ | ​ |
| ​                                       |
| (Dollars in thousands)                        | ​ | ​ | Residential Real Estate, HELOC, and Consumer | ​ | ​ | Non-residential Real Estate | ​ | ​ | Construction and Land | ​ | ​ | Total   | ​ |
|-----------------------------------------------|---------|---------|----------------------------------------------|---------|---------|-----------------------------|---------|---------|-----------------------|---------|---------|---------|---------|
| Non-accruing troubled debt restructured loans | ​ | ​ | ​                                      | $       | 565     | ​                     | ​ | ​ | ​               | $       | 1,020   | ​ | ​ | ​ | ​ | $ | 33 | ​ | ​ | ​ | ​ | $ | 1,618 | ​ | ​ |
| Other non-accrual loans                       | ​ | ​ | ​                                      | ​ | 541     | ​                     | ​ | ​ | ​               | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 541 | ​ | ​ |
| Total non-accrual loans                       | ​ | ​ | ​                                      | ​ | 1,106   | ​                     | ​ | ​ | ​               | ​ | 1,020   | ​ | ​ | ​ | ​ | ​ | 33 | ​ | ​ | ​ | ​ | ​ | 2,159 | ​ | ​ |
| Accruing troubled debt restructured loans     | ​ | ​ | ​                                      | ​ | 1,172   | ​                     | ​ | ​ | ​               | ​ | 348     | ​ | ​ | ​ | ​ | ​ | 1,760 | ​ | ​ | ​ | ​ | ​ | 3,280 | ​ | ​ |
| Total                                         | ​ | ​ | ​                                      | $       | 2,278   | ​                     | ​ | ​ | ​               | $       | 1,368   | ​ | ​ | ​ | ​ | $ | 1,793 | ​ | ​ | ​ | ​ | $ | 5,439 | ​ | ​ |
| ​                                       |

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| (Dollars in thousands)               | ​ | ​ | Number of Contracts | ​ | ​ | Pre-modification Outstanding Recorded Investment | ​ | ​ | Post-modification Outstanding Recorded Investment | ​ |
|--------------------------------------|---------|---------|---------------------|---------|---------|--------------------------------------------------|---------|---------|---------------------------------------------------|---------|
| Residential real estate and consumer | ​ | ​ | ​             | ​ | 1       | ​                                          | ​ | ​ | ​                                           | $       | 156 | ​ | ​ | ​ | ​ | $ | 156 | ​ | ​ |
| Non-residential real estate          | ​ | ​ | ​             | ​ | — | ​                                          | ​ | ​ | ​                                           | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Construction and land                | ​ | ​ | ​             | ​ | — | ​                                          | ​ | ​ | ​                                           | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Total                                | ​ | ​ | ​             | ​ | 1       | ​                                          | ​ | ​ | ​                                           | $       | 156 | ​ | ​ | ​ | ​ | $ | 156 | ​ | ​ |
| ​                              |
| (Dollars in thousands)               | ​ | ​ | Number of Contracts | ​ | ​ | Pre-modification Outstanding Recorded Investment | ​ | ​ | Post-modification Outstanding Recorded Investment | ​ |
|--------------------------------------|---------|---------|---------------------|---------|---------|--------------------------------------------------|---------|---------|---------------------------------------------------|---------|
| Residential real estate and consumer | ​ | ​ | ​             | ​ | 2       | ​                                          | ​ | ​ | ​                                           | $       | 347 | ​ | ​ | ​ | ​ | $ | 347 | ​ | ​ |
| Non-residential real estate          | ​ | ​ | ​             | ​ | — | ​                                          | ​ | ​ | ​                                           | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Construction and land                | ​ | ​ | ​             | ​ | — | ​                                          | ​ | ​ | ​                                           | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Total                                | ​ | ​ | ​             | ​ | 2       | ​                                          | ​ | ​ | ​                                           | $       | 347 | ​ | ​ | ​ | ​ | $ | 347 | ​ | ​ |
| ​                              |
| (Dollars in thousands)                         | ​ | ​ | December 31, 2017 | ​ | ​ | December 31, 2016 | ​ |
|------------------------------------------------|---------|---------|-------------------|---------|---------|-------------------|---------|
| Land                                           | ​ | ​ | ​           | $       | 1,018   | ​           | ​ | ​ | ​ | $ | 1,018 | ​ | ​ |
| Buildings                                      | ​ | ​ | ​           | ​ | 4,398   | ​           | ​ | ​ | ​ | ​ | 4,346 | ​ | ​ |
| Furniture, fixtures and equipment              | ​ | ​ | ​           | ​ | 1,021   | ​           | ​ | ​ | ​ | ​ | 983 | ​ | ​ |
| ​                                        | ​ | ​ | ​           | ​ | 6,437   | ​           | ​ | ​ | ​ | ​ | 6,347 | ​ | ​ |
| Less accumulated depreciation and amortization | ​ | ​ | ​           | ​ | 2,773   | ​           | ​ | ​ | ​ | ​ | 2,670 | ​ | ​ |
| Total property and equipment                   | ​ | ​ | ​           | $       | 3,664   | ​           | ​ | ​ | ​ | $ | 3,677 | ​ | ​ |
| ​                                        |

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| Year Ending December 31: | ​ | ​ |
|--------------------------|---------|---------|
| 2018                     | ​ | ​ | ​ | ​ | 82,366 | ​ | ​ |
| 2019                     | ​ | ​ | ​ | ​ | 84,837 | ​ | ​ |
| 2020                     | ​ | ​ | ​ | ​ | 87,383 | ​ | ​ |
| 2021                     | ​ | ​ | ​ | ​ | 90,004 | ​ | ​ |
| 2022                     | ​ | ​ | ​ | ​ | 61,346 | ​ | ​ |
| ​                  | ​ | ​ | ​ | $ | 405,936 | ​ | ​ |
| ​                  |
| (Dollars in thousands) | ​ | ​ | December 31, 2017 | ​ | ​ | December 31, 2016 | ​ |
|------------------------|---------|---------|-------------------|---------|---------|-------------------|---------|
| Beginning balance      | ​ | ​ | ​           | $       | — | ​           | ​ | ​ | ​ | $ | — | ​ | ​ |
| Additions              | ​ | ​ | ​           | ​ | — | ​           | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Transfers from Loans   | ​ | ​ | ​           | ​ | — | ​           | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Transfers to Loans     | ​ | ​ | ​           | ​ | — | ​           | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Sales                  | ​ | ​ | ​           | ​ | — | ​           | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Provisions             | ​ | ​ | ​           | ​ | — | ​           | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Ending balance         | ​ | ​ | ​           | $       | — | ​           | ​ | ​ | ​ | $ | — | ​ | ​ |
| ​                |
| (Dollars in thousands)        | ​ | ​ | December 31, 2017 | ​ | ​ | December 31, 2016 | ​ |
|-------------------------------|---------|---------|-------------------|---------|---------|-------------------|---------|
| Non-interest-bearing deposits | ​ | ​ | ​           | $       | 1,542   | ​           | ​ | ​ | ​ | $ | 1,415 | ​ | ​ |
| NOW and Money market          | ​ | ​ | ​           | ​ | 21,481  | ​           | ​ | ​ | ​ | ​ | 21,241 | ​ | ​ |
| Savings                       | ​ | ​ | ​           | ​ | 14,718  | ​           | ​ | ​ | ​ | ​ | 13,811 | ​ | ​ |
| Certificates of deposit       | ​ | ​ | ​           | ​ | 65,567  | ​           | ​ | ​ | ​ | ​ | 56,548 | ​ | ​ |
| Total deposits                | ​ | ​ | ​           | $       | 103,308 | ​           | ​ | ​ | ​ | $ | 93,015 | ​ | ​ |
| ​                       |
| (Dollars in thousands) | ​ | ​ |
|------------------------|---------|---------|
| 2018                   | ​ | ​ | ​ | $ | 35,440 | ​ | ​ |
| 2019                   | ​ | ​ | ​ | ​ | 11,309 | ​ | ​ |
| 2020                   | ​ | ​ | ​ | ​ | 7,331 | ​ | ​ |
| 2021                   | ​ | ​ | ​ | ​ | 7,527 | ​ | ​ |
| 2022                   | ​ | ​ | ​ | ​ | 3,960 | ​ | ​ |
| Total                  | ​ | ​ | ​ | $ | 65,567 | ​ | ​ |
| ​                |

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| (Dollars in thousands)                           | ​ | ​ | December 31, 2017 | ​ | ​ | December 31, 2016 | ​ |
|--------------------------------------------------|---------|---------|-------------------|---------|---------|-------------------|---------|
| Deferred tax assets:                             | ​ | ​ | ​           | ​ | ​ | ​           | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Deferred loan fees and costs, net                | ​ | ​ | ​           | $       | 9       | ​           | ​ | ​ | ​ | $ | 12 | ​ | ​ |
| Allowance for credit losses                      | ​ | ​ | ​           | ​ | 355     | ​           | ​ | ​ | ​ | ​ | 481 | ​ | ​ |
| Deferred compensation                            | ​ | ​ | ​           | ​ | 44      | ​           | ​ | ​ | ​ | ​ | 67 | ​ | ​ |
| Severance payments                               | ​ | ​ | ​           | ​ | 60      | ​           | ​ | ​ | ​ | ​ | 170 | ​ | ​ |
| Restricted stock awards                          | ​ | ​ | ​           | ​ | 14      | ​           | ​ | ​ | ​ | ​ | 2 | ​ | ​ |
| Allowance for ground rents                       | ​ | ​ | ​           | ​ | 39      | ​           | ​ | ​ | ​ | ​ | 56 | ​ | ​ |
| Allowance for delinquent mortgage interest       | ​ | ​ | ​           | ​ | 101     | ​           | ​ | ​ | ​ | ​ | 141 | ​ | ​ |
| Contribution carryforward                        | ​ | ​ | ​           | ​ | 2       | ​           | ​ | ​ | ​ | ​ | 2 | ​ | ​ |
| Net operating loss carryforward                  | ​ | ​ | ​           | ​ | 1,354   | ​           | ​ | ​ | ​ | ​ | 1,831 | ​ | ​ |
| Unrealized loss on available-for-sale securities | ​ | ​ | ​           | ​ | — | ​           | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Total deferred tax assets                        | ​ | ​ | ​           | ​ | 1,978   | ​           | ​ | ​ | ​ | ​ | 2,762 | ​ | ​ |
| Valuation allowance                              | ​ | ​ | ​           | ​ | (1,883) | ​           | ​ | ​ | ​ | ​ | (2,608) | ​ | ​ |
| Deferred tax assets after valuation allowance    | ​ | ​ | ​           | ​ | 95      | ​           | ​ | ​ | ​ | ​ | 154 | ​ | ​ |
| Deferred tax liabilities:                        | ​ | ​ | ​           | ​ | ​ | ​           | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Depreciation                                     | ​ | ​ | ​           | ​ | 95      | ​           | ​ | ​ | ​ | ​ | 130 | ​ | ​ |
| ESOP                                             | ​ | ​ | ​           | ​ | — | ​           | ​ | ​ | ​ | ​ | 24 | ​ | ​ |
| Total deferred tax liabilities                   | ​ | ​ | ​           | ​ | 95      | ​           | ​ | ​ | ​ | ​ | 154 | ​ | ​ |
| Net deferred tax assets                          | ​ | ​ | ​           | $       | — | ​           | ​ | ​ | ​ | $ | — | ​ | ​ |
| ​                                          |
| ​                   | ​ | ​ | Year Ended December 31 | ​ |
|---------------------------|---------|---------|------------------------|---------|
| (Dollars in thousands)    | ​ | ​ | 2017                   | ​ | ​ | 2016 | ​ |
| Tax expense (benefit):    | ​ | ​ | ​                | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Current federal and state | ​ | ​ | ​                | $       | — | ​ | ​ | ​ | ​ | $ | (15) | ​ | ​ |
| Deferred tax              | ​ | ​ | ​                | ​ | — | ​ | ​ | ​ | ​ | ​ | 786 | ​ | ​ |
| Total                     | ​ | ​ | ​                | $       | — | ​ | ​ | ​ | ​ | $ | 771 | ​ | ​ |
| ​                   |
| ​                                        | ​ | ​ | 12 Months Ended December 31, 2017 | ​ | ​ | 12 Months Ended December 31, 2016 | ​ |
|------------------------------------------------|---------|---------|-----------------------------------|---------|---------|-----------------------------------|---------|
| Computed at federal statutory rates            | ​ | ​ | ​                           | ​ | 34.0%   | ​                           | ​ | ​ | ​ | ​ | (34.0)% | ​ | ​ |
| State income taxes, net of federal tax benefit | ​ | ​ | ​                           | ​ | 0.0     | ​                           | ​ | ​ | ​ | ​ | 0.0 | ​ | ​ |
| Bank-owned life insurance income               | ​ | ​ | ​                           | ​ | (76.0)  | ​                           | ​ | ​ | ​ | ​ | (1.2) | ​ | ​ |
| Nondeductibles                                 | ​ | ​ | ​                           | ​ | 13.1    | ​                           | ​ | ​ | ​ | ​ | 0.9 | ​ | ​ |
| Valuation allowance                            | ​ | ​ | ​                           | ​ | 2.4     | ​                           | ​ | ​ | ​ | ​ | 111.7 | ​ | ​ |
| Other                                          | ​ | ​ | ​                           | ​ | 26.6    | ​                           | ​ | ​ | ​ | ​ | 1.3 | ​ | ​ |
| Total                                          | ​ | ​ | ​                           | ​ | 0.0%    | ​                           | ​ | ​ | ​ | ​ | 78.7% | ​ | ​ |
| ​                                        |

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| (Dollars in thousands)                   | ​ | ​ | Valuation Allowance | ​ |
|------------------------------------------|---------|---------|---------------------|---------|
| Balance of January 1, 2016               | ​ | ​ | ​             | $       | (1,442) | ​ | ​ |
| Expiration of capital loss carryforwards | ​ | ​ | ​             | ​ | — | ​ | ​ |
| Increase in valuation allowance          | ​ | ​ | ​             | ​ | (1,166) | ​ | ​ |
| Balance of December 31, 2016             | ​ | ​ | ​             | $       | (2,608) | ​ | ​ |
| Expiration of capital loss carryforwards | ​ | ​ | ​             | ​ | — | ​ | ​ |
| Increase in valuation allowance          | ​ | ​ | ​             | ​ | 725 | ​ | ​ |
| Balance of December 31, 2017             | ​ | ​ | ​             | $       | (1,883) | ​ | ​ |
| ​                                  |

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| (Dollars in thousands) | ​ | ​ | Interest Rate | ​ | ​ | December 31, 2017 | ​ | ​ | December 31, 2016 | ​ |
|------------------------|---------|---------|---------------|---------|---------|-------------------|---------|---------|-------------------|---------|
| January 20, 2017       | ​ | ​ | ​       | ​ | 0.61    | ​           | ​ | ​ | ​           | ​ | — | ​ | ​ | ​ | ​ | ​ | 6,000 | ​ | ​ |
| February 27, 2017      | ​ | ​ | ​       | ​ | 4.397   | ​           | ​ | ​ | ​           | ​ | — | ​ | ​ | ​ | ​ | ​ | 1,000 | ​ | ​ |
| March 12, 2018         | ​ | ​ | ​       | ​ | 1.46    | ​           | ​ | ​ | ​           | ​ | 4,000 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| December 14, 2018      | ​ | ​ | ​       | ​ | 1.41    | ​           | ​ | ​ | ​           | ​ | 4,000 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| ​                | ​ | ​ | ​       | ​ | ​ | ​           | ​ | ​ | ​           | $       | 8,000 | ​ | ​ | ​ | ​ | $ | 7,000 | ​ | ​ |
| ​                |

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| (Dollars in thousands, except per share amount) | ​ | ​ | December 31, 2017 | ​ | ​ | December 31, 2016 | ​ |
|-------------------------------------------------|---------|---------|-------------------|---------|---------|-------------------|---------|
| Shares released and allocated                   | ​ | ​ | ​           | ​ | 32,577  | ​           | ​ | ​ | ​ | ​ | 23,510 | ​ | ​ |
| Unearned shares                                 | ​ | ​ | ​           | ​ | 134,485 | ​           | ​ | ​ | ​ | ​ | 145,770 | ​ | ​ |
| ​                                         | ​ | ​ | ​           | ​ | 167,062 | ​           | ​ | ​ | ​ | ​ | 169,280 | ​ | ​ |
| Fair value of unearned shares                   | ​ | ​ | ​           | $       | 2,381   | ​           | ​ | ​ | ​ | $ | 2,157 | ​ | ​ |
| ​                                         |
| ​                        | ​ | ​ | Shares  | ​ | ​ | Weighted-Average Grant-Date Fair Value | ​ |
|--------------------------------|---------|---------|---------|---------|---------|----------------------------------------|---------|
| Nonvested at January 1, 2016   | ​ | ​ | ​ | ​ | — | ​                                | ​ | ​ | ​ | $ | — | ​ | ​ |
| Granted                        | ​ | ​ | ​ | ​ | 2,500   | ​                                | ​ | ​ | ​ | ​ | 13.40 | ​ | ​ |
| Vested                         | ​ | ​ | ​ | ​ | — | ​                                | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Forfeited                      | ​ | ​ | ​ | ​ | — | ​                                | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Nonvested at December 31, 2016 | ​ | ​ | ​ | ​ | 2,500   | ​                                | ​ | ​ | ​ | $ | 13.40 | ​ | ​ |
| Nonvested at January 1, 2017   | ​ | ​ | ​ | ​ | 2,500   | ​                                | ​ | ​ | ​ | $ | 13.40 | ​ | ​ |
| Granted                        | ​ | ​ | ​ | ​ | 50,000  | ​                                | ​ | ​ | ​ | ​ | 15.29 | ​ | ​ |
| Vested                         | ​ | ​ | ​ | ​ | 1,250   | ​                                | ​ | ​ | ​ | ​ | 13.40 | ​ | ​ |
| Forfeited                      | ​ | ​ | ​ | ​ | — | ​                                | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Nonvested at December 31, 2017 | ​ | ​ | ​ | ​ | 51,250  | ​                                | ​ | ​ | ​ | $ | 15.24 | ​ | ​ |
| Fair Value of shares vested    | ​ | ​ | ​ | $       | 19,688  | ​                                | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| ​                        |

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| Year Ending December 31, | ​ | ​ | Number of restricted shares | ​ |
|--------------------------|---------|---------|-----------------------------|---------|
| 2018                     | ​ | ​ | ​                     | ​ | 11,250 | ​ | ​ |
| 2019                     | ​ | ​ | ​                     | ​ | 10,000 | ​ | ​ |
| 2020                     | ​ | ​ | ​                     | ​ | 10,000 | ​ | ​ |
| 2021                     | ​ | ​ | ​                     | ​ | 10,000 | ​ | ​ |
| 2022                     | ​ | ​ | ​                     | ​ | 10,000 | ​ | ​ |
| ​                  | ​ | ​ | ​                     | ​ | 51,250 | ​ | ​ |
| ​                  |
| (Dollars in thousands)         | ​ | ​ | 12 Months Ended December 31, 2017 | ​ | ​ | 12 Months Ended December 31, 2016 | ​ |
|--------------------------------|---------|---------|-----------------------------------|---------|---------|-----------------------------------|---------|
| Balance at beginning of period | ​ | ​ | ​                           | $       | 765     | ​                           | ​ | ​ | ​ | $ | 923 | ​ | ​ |
| Additions                      | ​ | ​ | ​                           | ​ | 181     | ​                           | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Repayments                     | ​ | ​ | ​                           | ​ | (33)    | ​                           | ​ | ​ | ​ | ​ | (38) | ​ | ​ |
| Change in status               | ​ | ​ | ​                           | ​ | — | ​                           | ​ | ​ | ​ | ​ | (120) | ​ | ​ |
| Balance at end of period       | ​ | ​ | ​                           | $       | 913     | ​                           | ​ | ​ | ​ | $ | 765 | ​ | ​ |
| ​                        |

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| ​                                                | ​ | ​ | Actual  | ​ | ​ | Minimum Requirements for Capital Adequacy Purposes and to be Adequately Capitalized Capitalized Under the Prompt Corrective Action Provisions | ​ | ​ | To Be Well Capitalized Under the Prompt Corrective Action Provisions | ​ |
|--------------------------------------------------------|---------|---------|---------|---------|---------|-----------------------------------------------------------------------------------------------------------------------------------------------|---------|---------|----------------------------------------------------------------------|---------|
| (Dollars in thousands)                                 | ​ | ​ | Amount  | ​ | ​ | Ratio                                                                                                                                         | ​ | ​ | Amount                                                               | ​ | ​ | Ratio | ​ | ​ | Amount | ​ | ​ | Ratio | ​ |
| As of December 31, 2017:                               | ​ | ​ | ​ | ​ | ​ | ​                                                                                                                                       | ​ | ​ | ​                                                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Total risk-based capital (to risk-weighted assets)     | ​ | ​ | ​ | $       | 24,934  | ​                                                                                                                                       | ​ | ​ | ​                                                              | ​ | 32.58% | ​ | ​ | ​ | ​ | $ | 7,078 | ​ | ​ | ​ | ​ | ​ | 9.25% | ​ | ​ | ​ | ​ | $ | 7,653 | ​ | ​ | ​ | ​ | ​ | 10.00% | ​ | ​ |
| Tier I capital (to risk-weighted assets)               | ​ | ​ | ​ | ​ | 23,974  | ​                                                                                                                                       | ​ | ​ | ​                                                              | ​ | 31.33 | ​ | ​ | ​ | ​ | ​ | 5,548 | ​ | ​ | ​ | ​ | ​ | 7.25 | ​ | ​ | ​ | ​ | ​ | 6,122 | ​ | ​ | ​ | ​ | ​ | 8.00 | ​ | ​ |
| Tier I capital (to adjusted total assets)              | ​ | ​ | ​ | ​ | 23,974  | ​                                                                                                                                       | ​ | ​ | ​                                                              | ​ | 16.55 | ​ | ​ | ​ | ​ | ​ | 5,795 | ​ | ​ | ​ | ​ | ​ | 4.00 | ​ | ​ | ​ | ​ | ​ | 7,243 | ​ | ​ | ​ | ​ | ​ | 5.00 | ​ | ​ |
| Common equity tier 1 capital (to risk weighted assets) | ​ | ​ | ​ | ​ | 23,974  | ​                                                                                                                                       | ​ | ​ | ​                                                              | ​ | 31.33 | ​ | ​ | ​ | ​ | ​ | 4,400 | ​ | ​ | ​ | ​ | ​ | 5.75 | ​ | ​ | ​ | ​ | ​ | 4,974 | ​ | ​ | ​ | ​ | ​ | 6.50 | ​ | ​ |
| As of December 31, 2016:                               | ​ | ​ | ​ | ​ | ​ | ​                                                                                                                                       | ​ | ​ | ​                                                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Total risk-based capital (to risk-weighted assets)     | ​ | ​ | ​ | $       | 24,359  | ​                                                                                                                                       | ​ | ​ | ​                                                              | ​ | 37.47% | ​ | ​ | ​ | ​ | $ | 5,606 | ​ | ​ | ​ | ​ | ​ | 8.625% | ​ | ​ | ​ | ​ | ​ | 6,501 | ​ | ​ | ​ | ​ | ​ | 10.00% | ​ | ​ |
| Tier I capital (to risk-weighted assets)               | ​ | ​ | ​ | ​ | 23,541  | ​                                                                                                                                       | ​ | ​ | ​                                                              | ​ | 36.22 | ​ | ​ | ​ | ​ | ​ | 4,306 | ​ | ​ | ​ | ​ | ​ | 6.625 | ​ | ​ | ​ | ​ | ​ | 5,200 | ​ | ​ | ​ | ​ | ​ | 8.00 | ​ | ​ |
| Tier I capital (to adjusted total assets)              | ​ | ​ | ​ | ​ | 23,541  | ​                                                                                                                                       | ​ | ​ | ​                                                              | ​ | 17.44 | ​ | ​ | ​ | ​ | ​ | 5,400 | ​ | ​ | ​ | ​ | ​ | 44.00 | ​ | ​ | ​ | ​ | ​ | 6,749 | ​ | ​ | ​ | ​ | ​ | 5.00 | ​ | ​ |
| Common equity tier 1 capital (to risk weighted assets) | ​ | ​ | ​ | ​ | 23,541  | ​                                                                                                                                       | ​ | ​ | ​                                                              | ​ | 36.22 | ​ | ​ | ​ | ​ | ​ | 3,331 | ​ | ​ | ​ | ​ | ​ | 5.125 | ​ | ​ | ​ | ​ | ​ | 4,225 | ​ | ​ | ​ | ​ | ​ | 6.50 | ​ | ​ |
| (Dollars in thousands)                                               | ​ | ​ | December 31, 2017 | ​ | ​ | December 31, 2016 | ​ |
|----------------------------------------------------------------------|---------|---------|-------------------|---------|---------|-------------------|---------|
| Total Company equity capital                                         | ​ | ​ | ​           | $       | 30,360  | ​           | ​ | ​ | ​ | $ | 30,324 | ​ | ​ |
| LESS: Parent Only Equity                                             | ​ | ​ | ​           | ​ | 6,615   | ​           | ​ | ​ | ​ | ​ | 6,922 | ​ | ​ |
| LESS: Net unrealized (losses) gains on available-for-sale securities | ​ | ​ | ​           | ​ | (229)   | ​           | ​ | ​ | ​ | ​ | (139) | ​ | ​ |
| Tier 1 Capital                                                       | ​ | ​ | ​           | $       | 23,974  | ​           | ​ | ​ | ​ | $ | 23,541 | ​ | ​ |
| Tier 1 Capital                                                       | ​ | ​ | ​           | $       | 23,974  | ​           | ​ | ​ | ​ | $ | 23,541 | ​ | ​ |
| Allowance for loan and lease losses includible in Tier 2 capital     | ​ | ​ | ​           | ​ | 960     | ​           | ​ | ​ | ​ | ​ | 818 | ​ | ​ |
| Total risk-based capital                                             | ​ | ​ | ​           | $       | 24,934  | ​           | ​ | ​ | ​ | $ | 24,359 | ​ | ​ |
| ​                                                              |

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| (Dollars in thousands)                               | ​ | ​ | Before Tax | ​ | ​ | Tax Effect | ​ | ​ | Net of Tax | ​ |
|------------------------------------------------------|---------|---------|------------|---------|---------|------------|---------|---------|------------|---------|
| Year Ended December 31, 2017                         | ​ | ​ | ​    | ​ | ​ | ​    | ​ | ​ | ​    | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Net unrealized loss on securities available-for-sale | ​ | ​ | ​    | $       | (90)    | ​    | ​ | ​ | ​    | $       | — | ​ | ​ | ​ | ​ | $ | (90) | ​ | ​ |
| Other Comprehensive Loss                             | ​ | ​ | ​    | $       | (90)    | ​    | ​ | ​ | ​    | $       | — | ​ | ​ | ​ | ​ | $ | (90) | ​ | ​ |
| Year Ended December 31, 2016                         | ​ | ​ | ​    | ​ | ​ | ​    | ​ | ​ | ​    | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Net unrealized loss on securities available-for-sale | ​ | ​ | ​    | $       | (128)   | ​    | ​ | ​ | ​    | $       | — | ​ | ​ | ​ | ​ | $ | (128) | ​ | ​ |
| Other Comprehensive Loss                             | ​ | ​ | ​    | $       | (128)   | ​    | ​ | ​ | ​    | $       | — | ​ | ​ | ​ | ​ | $ | (128) | ​ | ​ |
| ​                                              |
| ​                      | ​ | ​ | Securities Available-for-Sale | ​ | ​ | Accumulated Other Comprehensive Loss | ​ |
|------------------------------|---------|---------|-------------------------------|---------|---------|--------------------------------------|---------|
| Year Ended December 31, 2017 | ​ | ​ | ​                       | ​ | ​ | ​                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Balance at Beginning of Year | ​ | ​ | ​                       | $       | (139)   | ​                              | ​ | ​ | ​ | $ | (139) | ​ | ​ |
| Other comprehensive loss     | ​ | ​ | ​                       | ​ | (90)    | ​                              | ​ | ​ | ​ | ​ | (90) | ​ | ​ |
| Balance at End of Period     | ​ | ​ | ​                       | $       | (229)   | ​                              | ​ | ​ | ​ | $ | (229) | ​ | ​ |
| ​                      |
| ​                      | ​ | ​ | Securities Available-for-Sale | ​ | ​ | Accumulated Other Comprehensive Loss | ​ |
|------------------------------|---------|---------|-------------------------------|---------|---------|--------------------------------------|---------|
| Year Ended December 31, 2016 | ​ | ​ | ​                       | ​ | ​ | ​                              | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Balance at Beginning of Year | ​ | ​ | ​                       | $       | (11)    | ​                              | ​ | ​ | ​ | $ | (11) | ​ | ​ |
| Other comprehensive loss     | ​ | ​ | ​                       | ​ | (128)   | ​                              | ​ | ​ | ​ | ​ | (128) | ​ | ​ |
| Balance at End of Period     | ​ | ​ | ​                       | $       | (139)   | ​                              | ​ | ​ | ​ | $ | (139) | ​ | ​ |
| ​                      |
| Details about Accumulated Other Comprehensive Income Components | ​ | ​ | Amount Reclassified from Accumulated Other Comprehensive Income | ​ | ​ | Affected Line Item in the Statement Where Net Income Is Presented | ​ |
|-----------------------------------------------------------------|---------|---------|-----------------------------------------------------------------|---------|---------|-------------------------------------------------------------------|---------|
| (Dollars in thousands)                                          | ​ | ​ | December 31, 2017                                               | ​ | ​ | December 31, 2016                                                 | ​ | ​ |
| Redemption of Investment Securities Available-for-sale          | ​ | ​ | ​                                                         | $       | 57      | ​                                                           | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | Realized gain on redemption of investment securities | ​ |
| ​                                                         | ​ | ​ | ​                                                         | ​ | — | ​                                                           | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | Provision for Income Tax | ​ |
| ​                                                         | ​ | ​ | ​                                                         | $       | 57      | ​                                                           | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | Net of Tax | ​ |
| Total Reclassifications for the Period                          | ​ | ​ | ​                                                         | $       | 57      | ​                                                           | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | Net of Tax | ​ |
| ​                                                         |

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| ​                                         | ​ | ​ | December 31, 2017         | ​ |
|-------------------------------------------------|---------|---------|---------------------------|---------|
| (Dollars in thousands, except per share amount) | ​ | ​ | Income (Loss) (Numerator) | ​ | ​ | Shares (Denominator) | ​ | ​ | Per Share Amount | ​ |
| Basic EPS                                       | ​ | ​ | ​                   | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Net loss available to shareholders              | ​ | ​ | ​                   | $       | 73 | ​ | ​ | ​ | ​ | ​ | 1,767,742 | ​ | ​ | ​ | ​ | $ | 0.04 | ​ | ​ |
| Diluted EPS                                     | ​ | ​ | ​                   | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Effect of dilutive shares                       | ​ | ​ | ​                   | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Net loss available to shareholders              | ​ | ​ | ​                   | $       | 73 | ​ | ​ | ​ | ​ | ​ | 1,767,742 | ​ | ​ | ​ | ​ | $ | 0.04 | ​ | ​ |
| ​                                         |
| ​                                         | ​ | ​ | December 31, 2016         | ​ |
|-------------------------------------------------|---------|---------|---------------------------|---------|
| (Dollars in thousands, except per share amount) | ​ | ​ | Income (Loss) (Numerator) | ​ | ​ | Shares (Denominator) | ​ | ​ | Per Share Amount | ​ |
| Basic EPS                                       | ​ | ​ | ​                   | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Net loss available to shareholders              | ​ | ​ | ​                   | $       | (1,751) | ​ | ​ | ​ | ​ | ​ | 1,816,933 | ​ | ​ | ​ | ​ | $ | (0.96) | ​ | ​ |
| Diluted EPS                                     | ​ | ​ | ​                   | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Effect of dilutive shares                       | ​ | ​ | ​                   | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Net loss available to shareholders              | ​ | ​ | ​                   | $       | (1,751) | ​ | ​ | ​ | ​ | ​ | 1,816,933 | ​ | ​ | ​ | ​ | $ | (0.96) | ​ | ​ |
| ​                                         |

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| ​                                                  | ​ | ​ | Fair Value Measurements at December 31, 2017 Using: | ​ |
|----------------------------------------------------------|---------|---------|-----------------------------------------------------|---------|
| Description(Dollars in thousands)                        | ​ | ​ | Fair Value December 31, 2017                        | ​ | ​ | Quoted Prices in Active Markets for Identical Assets (Level 1) | ​ | ​ | Other Observable Inputs (Level 2) | ​ | ​ | Significant Unobservable Inputs (Level 3) | ​ | ​ | Trading Gains and (Losses) | ​ | ​ | Total Changes in Fair Values Included in Period Earnings | ​ |
| Investments (available-for-sale):                        | ​ | ​ | ​                                             | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Obligations of U.S. Government agencies                  | ​ | ​ | ​                                             | $       | 945 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 945 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ |
| Municipal securities                                     | ​ | ​ | ​                                             | ​ | 497 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 497 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Mortgage-backed securities:                              | ​ | ​ | ​                                             | ​ | 15,163 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 15,163 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Total assets measured at fair value on a recurring basis | ​ | ​ | ​                                             | $       | 16,605 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 16,605 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ |
| ​                                                  |
| ​                                                  | ​ | ​ | Fair Value Measurements at December 31, 2016 Using: | ​ |
|----------------------------------------------------------|---------|---------|-----------------------------------------------------|---------|
| Description(Dollars in thousands)                        | ​ | ​ | Fair Value December 31, 2016                        | ​ | ​ | Quoted Prices in Active Markets for Identical Assets (Level 1) | ​ | ​ | Other Observable Inputs (Level 2) | ​ | ​ | Significant Unobservable Inputs (Level 3) | ​ | ​ | Trading Gains and (Losses) | ​ | ​ | Total Changes in Fair Values Included in Period Earnings | ​ |
| Investments (available-for-sale):                        | ​ | ​ | ​                                             | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Obligations of U.S. Government agencies                  | ​ | ​ | ​                                             | $       | 933 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 933 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ |
| Mortgage-backed securities                               | ​ | ​ | ​                                             | ​ | 2,765 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 2,765 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Total assets measured at fair value on a recurring basis | ​ | ​ | ​                                             | $       | 3,698 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 3,698 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ |
| ​                                                  |
| ​                                                      | ​ | ​ | Fair Value Measurements at December 31, 2017 Using: | ​ |
|--------------------------------------------------------------|---------|---------|-----------------------------------------------------|---------|
| Description (Dollars in thousands)                           | ​ | ​ | Fair Value December 31, 2017                        | ​ | ​ | Quoted Prices in Active Markets for Identical Assets (Level 1) | ​ | ​ | Other Observable Inputs (Level 2) | ​ | ​ | Significant Unobservable Inputs (Level 3) | ​ | ​ | Trading Gains and (Losses) | ​ | ​ | Total Changes in Fair Values Included in Period Earnings | ​ |
| Impaired loans:                                              | ​ | ​ | ​                                             | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Residential                                                  | ​ | ​ | ​                                             | $       | 2,149 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 1,822 | ​ | ​ | ​ | ​ | $ | 327 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ |
| Commercial                                                   | ​ | ​ | ​                                             | ​ | 1,154 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 1,154 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Land                                                         | ​ | ​ | ​                                             | ​ | 1,094 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 1,094 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Construction                                                 | ​ | ​ | ​                                             | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Other real estate owned                                      | ​ | ​ | ​                                             | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Total assets measured at fair value on a non-recurring basis | ​ | ​ | ​                                             | $       | 4,397 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 4,070 | ​ | ​ | ​ | ​ | $ | 327 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ |
| ​                                                      |

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| ​                                                      | ​ | ​ | Fair Value Measurements at December 31, 2016 Using: | ​ |
|--------------------------------------------------------------|---------|---------|-----------------------------------------------------|---------|
| Description (Dollars in thousands)                           | ​ | ​ | Fair Value December 31, 2016                        | ​ | ​ | Quoted Prices in Active Markets for Identical Assets (Level 1) | ​ | ​ | Other Observable Inputs (Level 2) | ​ | ​ | Significant Unobservable Inputs (Level 3) | ​ | ​ | Trading Gains and (Losses) | ​ | ​ | Total Changes in Fair Values Included in Period Earnings | ​ |
| Impaired loans:                                              | ​ | ​ | ​                                             | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Residential                                                  | ​ | ​ | ​                                             | $       | 3,734 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 2,633 | ​ | ​ | ​ | ​ | $ | 1,101 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ |
| Commercial                                                   | ​ | ​ | ​                                             | ​ | 1,451 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 1,451 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Land                                                         | ​ | ​ | ​                                             | ​ | 2,346 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 2,346 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Construction                                                 | ​ | ​ | ​                                             | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Other real estate owned                                      | ​ | ​ | ​                                             | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Total assets measured at fair value on a non-recurring basis | ​ | ​ | ​                                             | $       | 7,531 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 6,430 | ​ | ​ | ​ | ​ | $ | 1,101 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ |
| ​                                                      |
| (Dollars in thousands)                                 | ​ | ​ | Carrying Value December 31, 2017 | ​ | ​ | Fair Value December 31, 2017 | ​ | ​ | Quoted Prices In Active Markets For Identical Assets (Level 1) | ​ | ​ | Other Observable Inputs (Level 2) | ​ | ​ | Significant Observable Inputs (Level 3) | ​ |
|--------------------------------------------------------|---------|---------|----------------------------------|---------|---------|------------------------------|---------|---------|----------------------------------------------------------------|---------|---------|-----------------------------------|---------|---------|-----------------------------------------|---------|
| ASSETS                                                 | ​ | ​ | ​                          | ​ | ​ | ​                      | ​ | ​ | ​                                                        | ​ | ​ | ​                           | ​ | ​ | ​                                 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Cash, interest bearing deposits and federal funds sold | ​ | ​ | ​                          | $       | 6,603   | ​                      | ​ | ​ | ​                                                        | $       | 6,603   | ​                           | ​ | ​ | ​                                 | $       | — | ​ | ​ | ​ | ​ | $ | 6,603 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ |
| Other interest bearing deposits in other banks         | ​ | ​ | ​                          | ​ | 2,607   | ​                      | ​ | ​ | ​                                                        | ​ | 2,607   | ​                           | ​ | ​ | ​                                 | ​ | — | ​ | ​ | ​ | ​ | ​ | 2,607 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Investment securities                                  | ​ | ​ | ​                          | ​ | 34,015  | ​                      | ​ | ​ | ​                                                        | ​ | 33,613  | ​                           | ​ | ​ | ​                                 | ​ | — | ​ | ​ | ​ | ​ | ​ | 33,613 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Federal Home Loan Bank stock                           | ​ | ​ | ​                          | ​ | 754     | ​                      | ​ | ​ | ​                                                        | ​ | 754     | ​                           | ​ | ​ | ​                                 | ​ | — | ​ | ​ | ​ | ​ | ​ | 754 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Loans, net                                             | ​ | ​ | ​                          | ​ | 93,765  | ​                      | ​ | ​ | ​                                                        | ​ | 94,009  | ​                           | ​ | ​ | ​                                 | ​ | — | ​ | ​ | ​ | ​ | ​ | 4,070 | ​ | ​ | ​ | ​ | ​ | 89,939 | ​ | ​ |
| Bank owned life insurance                              | ​ | ​ | ​                          | ​ | 4,574   | ​                      | ​ | ​ | ​                                                        | ​ | 4,574   | ​                           | ​ | ​ | ​                                 | ​ | — | ​ | ​ | ​ | ​ | ​ | 4,574 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Accrued interest receivable                            | ​ | ​ | ​                          | ​ | 394     | ​                      | ​ | ​ | ​                                                        | ​ | 394     | ​                           | ​ | ​ | ​                                 | ​ | — | ​ | ​ | ​ | ​ | ​ | 394 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| LIABILITIES                                            | ​ | ​ | ​                          | ​ | ​ | ​                      | ​ | ​ | ​                                                        | ​ | ​ | ​                           | ​ | ​ | ​                                 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Deposits                                               | ​ | ​ | ​                          | $       | 103,308 | ​                      | ​ | ​ | ​                                                        | $       | 99,719  | ​                           | ​ | ​ | ​                                 | $       | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 99,719 | ​ | ​ |
| FHLB advances                                          | ​ | ​ | ​                          | ​ | 13,000  | ​                      | ​ | ​ | ​                                                        | ​ | 12,978  | ​                           | ​ | ​ | ​                                 | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 12,978 | ​ | ​ |

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| (Dollars in thousands)                                 | ​ | ​ | Carrying Value December 31, 2016 | ​ | ​ | Fair Value December 31, 2016 | ​ | ​ | Quoted PricesIn Active Markets For Identical Assets (Level 1) | ​ | ​ | Other Observable Inputs (Level 2) | ​ | ​ | Significant Observable Inputs (Level 3) | ​ |
|--------------------------------------------------------|---------|---------|----------------------------------|---------|---------|------------------------------|---------|---------|---------------------------------------------------------------|---------|---------|-----------------------------------|---------|---------|-----------------------------------------|---------|
| ASSETS                                                 | ​ | ​ | ​                          | ​ | ​ | ​                      | ​ | ​ | ​                                                       | ​ | ​ | ​                           | ​ | ​ | ​                                 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Cash, interest bearing deposits and federal funds sold | ​ | ​ | ​                          | $       | 5,399   | ​                      | ​ | ​ | ​                                                       | $       | 5,399   | ​                           | ​ | ​ | ​                                 | $       | — | ​ | ​ | ​ | ​ | $ | 5,399 | ​ | ​ | ​ | ​ | $ | — | ​ | ​ |
| Other interest bearing deposits in other banks         | ​ | ​ | ​                          | ​ | 11,090  | ​                      | ​ | ​ | ​                                                       | ​ | 11,090  | ​                           | ​ | ​ | ​                                 | ​ | — | ​ | ​ | ​ | ​ | ​ | 11,090 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Investment securities                                  | ​ | ​ | ​                          | ​ | 22,516  | ​                      | ​ | ​ | ​                                                       | ​ | 21,969  | ​                           | ​ | ​ | ​                                 | ​ | — | ​ | ​ | ​ | ​ | ​ | 21,969 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Federal Home Loan Bank stock                           | ​ | ​ | ​                          | ​ | 418     | ​                      | ​ | ​ | ​                                                       | ​ | 418     | ​                           | ​ | ​ | ​                                 | ​ | — | ​ | ​ | ​ | ​ | ​ | 418 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Loans, net                                             | ​ | ​ | ​                          | ​ | 86,030  | ​                      | ​ | ​ | ​                                                       | ​ | 85,525  | ​                           | ​ | ​ | ​                                 | ​ | — | ​ | ​ | ​ | ​ | ​ | 6,430 | ​ | ​ | ​ | ​ | ​ | 79,095 | ​ | ​ |
| Bank owned life insurance                              | ​ | ​ | ​                          | ​ | 931     | ​                      | ​ | ​ | ​                                                       | ​ | 931     | ​                           | ​ | ​ | ​                                 | ​ | — | ​ | ​ | ​ | ​ | ​ | 931 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Accrued interest receivable                            | ​ | ​ | ​                          | ​ | 356     | ​                      | ​ | ​ | ​                                                       | ​ | 356     | ​                           | ​ | ​ | ​                                 | ​ | — | ​ | ​ | ​ | ​ | ​ | 356 | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| LIABILITIES                                            | ​ | ​ | ​                          | ​ | ​ | ​                      | ​ | ​ | ​                                                       | ​ | ​ | ​                           | ​ | ​ | ​                                 | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Deposits                                               | ​ | ​ | ​                          | $       | 93,015  | ​                      | ​ | ​ | ​                                                       | $       | 90,912  | ​                           | ​ | ​ | ​                                 | $       | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ | ​ | ​ | $ | 90,912 | ​ | ​ |
| FHLB advances                                          | ​ | ​ | ​                          | ​ | 7,000   | ​                      | ​ | ​ | ​                                                       | ​ | 7,005   | ​                           | ​ | ​ | ​                                 | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ | ​ | ​ | ​ | 7,005 | ​ | ​ |

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| (Dollars in thousands)                                                                                                                      | ​ | ​ | As of December 31, 2017 | ​ | ​ | As of December 31, 2016 | ​ |
|---------------------------------------------------------------------------------------------------------------------------------------------|---------|---------|-------------------------|---------|---------|-------------------------|---------|
| ASSETS:                                                                                                                                     | ​ | ​ | ​                 | ​ | ​ | ​                 | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Cash and due from banks                                                                                                                     | ​ | ​ | ​                 | $       | 4,804   | ​                 | ​ | ​ | ​ | $ | 3,360 | ​ | ​ |
| Other interest-bearing deposits in other banks                                                                                              | ​ | ​ | ​                 | ​ | 498     | ​                 | ​ | ​ | ​ | ​ | 2,241 | ​ | ​ |
| Loans receivable – ESOP                                                                                                   | ​ | ​ | ​                 | ​ | 1,345   | ​                 | ​ | ​ | ​ | ​ | 1,458 | ​ | ​ |
| Investment in bank subsidiary                                                                                                               | ​ | ​ | ​                 | ​ | 23,713  | ​                 | ​ | ​ | ​ | ​ | 23,275 | ​ | ​ |
| Other assets                                                                                                                                | ​ | ​ | ​                 | ​ | — | ​                 | ​ | ​ | ​ | ​ | 1 | ​ | ​ |
| TOTAL ASSETS                                                                                                                                | ​ | ​ | ​                 | $       | 30,360  | ​                 | ​ | ​ | ​ | $ | 30,335 | ​ | ​ |
| LIABILITIES AND STOCKHOLDERS’ EQUITY                                                                                                  | ​ |
| LIABILITIES:                                                                                                                                | ​ | ​ | ​                 | ​ | ​ | ​                 | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Other liabilities                                                                                                                           | ​ | ​ | ​                 | $       | — | ​                 | ​ | ​ | ​ | $ | 11 | ​ | ​ |
| Total liabilities                                                                                                                           | ​ | ​ | ​                 | ​ | — | ​                 | ​ | ​ | ​ | ​ | 11 | ​ | ​ |
| STOCKHOLDERS’ EQUITY:                                                                                                                 | ​ | ​ | ​                 | ​ | ​ | ​                 | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Common stock .01 par value; authorized 19,000,000 shares; issued 1,940,200 and 1,902,900 shares at December 31, 2017 and 2016, respectively | ​ | ​ | ​                 | ​ | 19      | ​                 | ​ | ​ | ​ | ​ | 19 | ​ | ​ |
| Additional paid-in capital                                                                                                                  | ​ | ​ | ​                 | ​ | 18,135  | ​                 | ​ | ​ | ​ | ​ | 18,132 | ​ | ​ |
| Retained earnings – substantially restricted                                                                              | ​ | ​ | ​                 | ​ | 13,780  | ​                 | ​ | ​ | ​ | ​ | 13,770 | ​ | ​ |
| Accumulated other comprehensive (loss) income                                                                                               | ​ | ​ | ​                 | ​ | (229)   | ​                 | ​ | ​ | ​ | ​ | (139) | ​ | ​ |
| Employee stock ownership plan                                                                                                               | ​ | ​ | ​                 | ​ | (1,345) | ​                 | ​ | ​ | ​ | ​ | (1,458) | ​ | ​ |
| Total stockholders’ equity                                                                                                            | ​ | ​ | ​                 | ​ | 30,360  | ​                 | ​ | ​ | ​ | ​ | 30,324 | ​ | ​ |
| TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY                                                                                            | ​ | ​ | ​                 | $       | 30,360  | ​                 | ​ | ​ | ​ | $ | 30,335 | ​ | ​ |
| ​                                                                                                                                     |

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| ​                                         | ​ | ​ | For the Years Ended December 31, | ​ |
|-------------------------------------------------|---------|---------|----------------------------------|---------|
| (Dollars in thousands)                          | ​ | ​ | 2017                             | ​ | ​ | 2016 | ​ |
| INCOME:                                         | ​ | ​ | ​                          | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Interest on ESOP loan                           | ​ | ​ | ​                          | $       | 47 | ​ | ​ | ​ | ​ | $ | 51 | ​ | ​ |
| Interest and dividends on investment securities | ​ | ​ | ​                          | ​ | 14 | ​ | ​ | ​ | ​ | ​ | 39 | ​ | ​ |
| Total income                                    | ​ | ​ | ​                          | ​ | 61 | ​ | ​ | ​ | ​ | ​ | 90 | ​ | ​ |
| EXPENSE:                                        | ​ | ​ | ​                          | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Interest on stock purchase refund               | ​ | ​ | ​                          | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Salaries and employee benefits                  | ​ | ​ | ​                          | ​ | 9 | ​ | ​ | ​ | ​ | ​ | 11 | ​ | ​ |
| Legal and professional expenses                 | ​ | ​ | ​                          | ​ | 60 | ​ | ​ | ​ | ​ | ​ | 77 | ​ | ​ |
| Advertising and marketing related expenses      | ​ | ​ | ​                          | ​ | 1 | ​ | ​ | ​ | ​ | ​ | 3 | ​ | ​ |
| Other expenses                                  | ​ | ​ | ​                          | ​ | 114 | ​ | ​ | ​ | ​ | ​ | 159 | ​ | ​ |
| Total expenses                                  | ​ | ​ | ​                          | ​ | 184 | ​ | ​ | ​ | ​ | ​ | 250 | ​ | ​ |
| LOSS BEFORE EQUITY IN LOSS OF BANK SUBSIDIARY   | ​ | ​ | ​                          | ​ | (123) | ​ | ​ | ​ | ​ | ​ | (160) | ​ | ​ |
| Equity in net income (loss) of bank subsidiary  | ​ | ​ | ​                          | ​ | 196 | ​ | ​ | ​ | ​ | ​ | (1,591) | ​ | ​ |
| NET INCOME (LOSS)                               | ​ | ​ | ​                          | $       | 73 | ​ | ​ | ​ | ​ | $ | (1,751) | ​ | ​ |
| ​                                         |
| ​                                                                             | ​ | ​ | For the Years Ended | ​ |
|-------------------------------------------------------------------------------------|---------|---------|---------------------|---------|
| (Dollars in thousands)                                                              | ​ | ​ | December 31,2017    | ​ | ​ | December 31, 2016 | ​ |
| CASH FLOWS FROM OPERATING ACTIVITIES:                                               | ​ | ​ | ​             | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Net income (loss)                                                                   | ​ | ​ | ​             | $       | 73 | ​ | ​ | ​ | ​ | $ | (1,751) | ​ | ​ |
| Adjustment to reconcile net income (loss) to net cash used in operating activities: | ​ | ​ | ​             | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Equity in undistributed net (income) loss                                           | ​ | ​ | ​             | ​ | (196) | ​ | ​ | ​ | ​ | ​ | 1,591 | ​ | ​ |
| (Decrease) Increase in accrued interest and other assets                            | ​ | ​ | ​             | ​ | (94) | ​ | ​ | ​ | ​ | ​ | 36 | ​ | ​ |
| Decrease in accounts payable and other liabilities                                  | ​ | ​ | ​             | ​ | (11) | ​ | ​ | ​ | ​ | ​ | 16 | ​ | ​ |
| Net cash used in operating activities                                               | ​ | ​ | ​             | ​ | (228) | ​ | ​ | ​ | ​ | ​ | (108) | ​ | ​ |
| CASH FLOWS FROM INVESTING ACTIVITIES:                                               | ​ | ​ | ​             | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Net decrease in other interest bearing deposits in other banks                      | ​ | ​ | ​             | ​ | 1,743 | ​ | ​ | ​ | ​ | ​ | 3,726 | ​ | ​ |
| Net decrease in loan-ESOP                                                           | ​ | ​ | ​             | ​ | 113 | ​ | ​ | ​ | ​ | ​ | 113 | ​ | ​ |
| Investment in bank subsidiary                                                       | ​ | ​ | ​             | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Net cash provided by investing activities                                           | ​ | ​ | ​             | ​ | 1,856 | ​ | ​ | ​ | ​ | ​ | 3,839 | ​ | ​ |
| CASH FLOWS FROM FINANCING ACTIVITIES:                                               | ​ | ​ | ​             | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Repurchase of common stock                                                          | ​ | ​ | ​             | ​ | (184) | ​ | ​ | ​ | ​ | ​ | (2,817) | ​ | ​ |
| Purchase of Employee Stock Ownership Plan                                           | ​ | ​ | ​             | ​ | — | ​ | ​ | ​ | ​ | ​ | — | ​ | ​ |
| Net cash used in financing activities                                               | ​ | ​ | ​             | ​ | (184) | ​ | ​ | ​ | ​ | ​ | (2,817) | ​ | ​ |
| INCREASE IN CASH AND CASH EQUIVALENTS                                               | ​ | ​ | ​             | ​ | 1,444 | ​ | ​ | ​ | ​ | ​ | 914 | ​ | ​ |
| CASH AND CASH EQUIVALENTS AT BEGINNING OF YEAR                                      | ​ | ​ | ​             | ​ | 3,360 | ​ | ​ | ​ | ​ | ​ | 2,446 | ​ | ​ |
| CASH AND CASH EQUIVALENTS AT END OF YEAR                                            | ​ | ​ | ​             | $       | 4,804 | ​ | ​ | ​ | ​ | $ | 3,360 | ​ | ​ |
| Supplemental cash flow information:                                                 | ​ | ​ | ​             | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ |
| Interest paid                                                                       | ​ | ​ | ​             | $       | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ |
| Income taxes paid                                                                   | ​ | ​ | ​             | $       | — | ​ | ​ | ​ | ​ | $ | — | ​ | ​ |
| ​                                                                             |

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| No.   | ​ | ​ | Description                                                                                                                                                                                                                                   | ​ |
|-------|---------|---------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------|
| 3.1   | ​ | ​ | Articles of Incorporation of MB Bancorp, Inc.(1)                                                                                                                                                                                              | ​ |
| 3.2   | ​ | ​ | Bylaws of MB Bancorp, Inc.(1)                                                                                                                                                                                                                 | ​ |
| 4.1   | ​ | ​ | Common Stock Certificate of MB Bancorp, Inc.(1)                                                                                                                                                                                               | ​ |
| 10.1  | ​ | ​ | Two-Year Change in Control Agreement between Madison Bank of Maryland and Philip P. Phillips+(2)                                                                                                                                              | ​ |
| 10.2  | ​ | ​ | Two-Year Change in Control Agreement between Madison Bank of Maryland and Lisa M. McGuire-Dick+(3)                                                                                                                                            | ​ |
| 10.3  | ​ | ​ | Two-Year Change in Control Agreement between Madison Bank of Maryland and John M. Wright+(4)                                                                                                                                                  | ​ |
| 10.4  | ​ | ​ | MB Bancorp, Inc. 2016 Equity Incentive Plan+(5)                                                                                                                                                                                               | ​ |
| 10.5  | ​ | ​ | Supplemental Life Insurance Agreement entered into by and between Madison Bank of Maryland and Phil Phillips effective January 2017.(6)                                                                                                  | ​ |
| 10.6  | ​ | ​ | Supplemental Life Insurance Agreement entered into by and between Madison Bank of Maryland and John M. Wright effective January 2017.(6)                                                                                                 | ​ |
| 10.7  | ​ | ​ | Supplemental Life Insurance Agreement entered into by and between Madison Bank of Maryland and Lisa M. McGuire-Dick effective January 2017.(6)                                                                                           | ​ |
| 10.8  | ​ | ​ | Director Emeritus Plan(6)                                                                                                                                                                                                                     | ​ |
| 10.9  | ​ | ​ | Standstill Agreement, dated February 20, 2018, by and among, MB Bancorp, Inc., Stilwell Activist Fund, L.P., Stilwell Activist Investments, L.P., Stilwell Partners, L.P., Stilwell Value LLC, Joseph Stilwell and Corissa J. Briglia(7) | ​ |
| 10.10 | ​ | ​ | Standstill Agreement, dated February 20, 2018, by and between, MB Bancorp, Inc. and Jeffrey Thorp(7)                                                                                                                                     | ​ |
| 21.1  | ​ | ​ | Subsidiaries*                                                                                                                                                                                                                                 | ​ |
| 23.1  | ​ | ​ | Consent of TGM Group LLC                                                                                                                                                                                                                      | ​ |
| 23.2  | ​ | ​ | Consent of Dixon Hughes Goodman LLP                                                                                                                                                                                                           | ​ |
| 31.1  | ​ | ​ | Rule 13a-14(a) Certification of Chief Executive Officer                                                                                                                                                                                  | ​ |
| 31.2  | ​ | ​ | Rule 13a-14(a) Certification of Chief Financial Officer                                                                                                                                                                                  | ​ |
| 32.1  | ​ | ​ | Section 1350 Certifications                                                                                                                                                                                                              | ​ |

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| No.   | ​ | ​ | Description                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 | ​ |
|-------|---------|---------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|---------|
| 101.1 | ​ | ​ | The following materials from the Company’s Annual Report on Form 10-K for the year ended December 31, 2017, formatted in XBRL (Extensible Business Reporting Language): (i) the Consolidated Balance Sheets, (ii) the Consolidated Statements of Operations; (iii) the Consolidated Statements of Comprehensive Income (Loss); (iv) the Consolidated Statements of Equity, (v) the Consolidated Statements of Cash Flows; and (vi) the Notes to the Consolidated Financial Statements* | ​ |

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| ​ | ​            | ​ | ​ | MB BANCORP, INC.                                                                                | ​ |
|---------|--------------------|---------|---------|-------------------------------------------------------------------------------------------------|---------|
| ​ | April 2, 2018 | ​ | ​ | By:/s/ Philip P. Phillips​​Philip P. Phillips President and Chief Executive Officer | ​ |

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