| **Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($) $ in Thousands**   | Total      | Common stock and additional paid-in capital | Retained earnings | Accumulated other comprehensive income (loss) |
|-------------------------------------------------------------------------------------------------------|------------|---------------------------------------------|-------------------|-----------------------------------------------|
| Beginning balance (in shares) at Dec. 31, 2016                                                        |       | 10,793,946                                  |              |                                          |
| Beginning balance at Dec. 31, 2016                                                                    | $ 172,521  | $ 60,831                                    | $ 111,693         | $ (3)                                         |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                        |       |                                        |              |                                          |
| Net income                                                                                            | 14,502     |                                        | 14,502            |                                          |
| Net unrealized gain on securities available for sale, net of tax                                      | 110        |                                        |              | 110                                           |
| Net unrealized gain on cash flow hedging derivative instruments, net of tax                           | (128)      |                                        |              | (128)                                         |
| Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax | (11)       |                                        |              | (11)                                          |
| Comprehensive income                                                                                  | 14,473     |                                        | 14,502            | (29)                                          |
| Cash dividends declared                                                                               | (7,682)    |                                        | (7,682)           |                                          |
| Equity compensation expense                                                                           | 247        | $ 247                                       |              |                                          |
| Payment to repurchase of common stock (in shares)                                                     |       | (5,560)                                     |              |                                          |
| Payment to repurchase common stock                                                                    | $ (153)    |                                        | (153)             |                                          |
| Issuance of restricted stock (in shares)                                                              | 0          | 18,850                                      |              |                                          |
| Proceeds from sale of common stock (in shares)                                                        |       | 17,488                                      |              |                                          |
| Proceeds from sale of common stock                                                                    | $ 476      | $ 476                                       |              |                                          |
| Ending balance (in shares) at Sep. 30, 2017                                                           | 10,824,724 | 10,824,724                                  |              |                                          |
| Ending balance at Sep. 30, 2017                                                                       | $ 179,882  | $ 61,554                                    | 118,360           | (32)                                          |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                        |       |                                        |              |                                          |
| Net income                                                                                            | 4,982      |                                        |              |                                          |
| Net unrealized gain on securities available for sale, net of tax                                      | (240)      |                                        |              |                                          |
| Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax | $ (3)      |                                        |              |                                          |
| Ending balance (in shares) at Sep. 30, 2017                                                           | 10,824,724 | 10,824,724                                  |              |                                          |
| Ending balance at Sep. 30, 2017                                                                       | $ 179,882  | $ 61,554                                    | 118,360           | (32)                                          |
| Beginning balance (in shares) at Dec. 31, 2017                                                        | 10,829,918 | 10,829,918                                  |              |                                          |
| Beginning balance at Dec. 31, 2017                                                                    | $ 181,321  | $ 61,855                                    | 121,144           | (1,678)                                       |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                        |       |                                        |              |                                          |
| Net income                                                                                            | 17,173     |                                        | 17,173            |                                          |
| Net unrealized gain on securities available for sale, net of tax                                      | (6,232)    |                                        |              | (6,232)                                       |
| Net unrealized gain on cash flow hedging derivative instruments, net of tax                           | 738        |                                        |              | 738                                           |
| Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax | (20)       |                                        |              | (20)                                          |
| Comprehensive income                                                                                  | 11,659     |                                        | 17,173            | (5,514)                                       |
| Cash dividends declared                                                                               | (8,902)    |                                        | (8,902)           |                                          |
| Equity compensation expense                                                                           | 285        | $ 285                                       |              |                                          |
| Payment to repurchase of common stock (in shares)                                                     |       | (5,725)                                     |              |                                          |
| Payment to repurchase common stock                                                                    | $ (168)    |                                        | (168)             |                                          |
| Issuance of restricted stock (in shares)                                                              | 0          | 16,795                                      |              |                                          |
| Proceeds from sale of common stock (in shares)                                                        |       | 16,128                                      |              |                                          |
| Proceeds from sale of common stock                                                                    | $ 466      | $ 466                                       |              |                                          |
| Ending balance (in shares) at Sep. 30, 2018                                                           | 10,857,116 | 10,857,116                                  |              |                                          |
| Ending balance at Sep. 30, 2018                                                                       | $ 184,661  | $ 62,606                                    | 129,247           | (7,192)                                       |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                                        |       |                                        |              |                                          |
| Net income                                                                                            | 5,933      |                                        |              |                                          |
| Net unrealized gain on securities available for sale, net of tax                                      | (1,888)    |                                        |              |                                          |
| Net unrealized loss on securities transferred from available for sale to held to maturity, net of tax | $ (5)      |                                        |              |                                          |
| Ending balance (in shares) at Sep. 30, 2018                                                           | 10,857,116 | 10,857,116                                  |              |                                          |
| Ending balance at Sep. 30, 2018                                                                       | $ 184,661  | $ 62,606                                    | $ 129,247         | $ (7,192)                                     |

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| - Definition
Available-for-sale Securities, Transferred to Held-to-maturity Securities, Unrealized Gain (Loss)
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| - Definition
Amount of increase to additional paid-in capital (APIC) from recognition of equity-based compensation.
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| - Definition
Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.
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| - Definition
Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.
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| - Definition
Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.
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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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| - Definition
Amount after tax and reclassification adjustments, of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).
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Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities.
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| - Definition
Number of new stock issued during the period.
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| - Definition
Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.
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Equity impact of the value of new stock issued during the period. Includes shares issued in an initial public offering or a secondary public offering.
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| - Definition
Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.
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| - Definition
Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.
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| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
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