| **Fair Values of Assets and Liabilities (Tables)**                                               | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   |
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| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation                | The following tables present a reconciliation of all assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) during the periods indicated:  Fair Value Measurements Using Significant  Unobservable Inputs (Level 3)  Mortgage Servicing Rights(dollars in thousands) Three Months Ended September 30,  2013 2012Balance, beginning of period $1,337 $25Total gains or losses (realized/unrealized):    Included in earnings, gross 235 225      Less amortization (90) (2)Balance, end of period $1,482 $248  Fair Value Measurements Using Significant  Unobservable Inputs (Level 3)  Mortgage Servicing Rights(dollars in thousands) Nine Months Ended September 30,  2013 2012Beginning balance at January 1, $726 $—Total gains or losses (realized/unrealized):    Included in earnings, gross 959 250      Less amortization (203) (2)Balance, end of period $1,482 $248                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques                        | (dollars in thousands) Fair Value at September 30, 2013 Valuation Techniques UnobservableInput Range        Impaired loans, net $2,477 Discounted appraisals Collateral discounts 6.00% - 40.00%Other real estate owned 25,271 Discounted appraisals Collateral discounts 6.00% - 40.00%Mortgage servicing rights 1,482 Discounted cash flows Prepayment rate 10.00% - 25.00%Mortgage servicing rights     Discount rate 6.00% - 10.00%(dollars in thousands) Fair Value atDecember 31, 2012 Valuation Techniques UnobservableInput Range         Impaired loans, net $13,575 Discounted appraisals Collateral discounts 6.00%-40.00%Other real estate owned 48,480 Discounted appraisals Collateral discounts 6.00%-40.00%Mortgage servicing rights 726 Discounted cash flows Prepayment rate 10.00% - 30.00%Mortgage servicing rights     Discount rate 6.00% - 12.00%                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Continuing operations [Member]                                                                   |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             |
| Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis                       | Assets and liabilities carried at fair value on a recurring basis at September 30, 2013 for continuing operations are summarized in the following table:(dollars in thousands) Total Level 1 Level 2 Level 3Assets:        Available-for-sale debt securities:        U.S. government sponsored agencies $2,082 $— $2,082 $—Residential mortgage-backed securities-GSE 357,447 — 357,447 —Residential mortgage-backed securities-Private 21,258 — 21,258 —Commercial mortgage-backed securities-GSE 21,644   21,644  Commercial mortgage-backed securities-Private 9,633 — 9,633 —Business Development Company investment 2,640 2,640 — —Corporate notes 25,008 — 25,008 —Total available-for-sale debt securities 439,712 2,640 437,072 —Mortgage servicing rights 1,482 — — 1,482Total assets at fair value from continuing operations $441,194 $2,640 $437,072 $1,482Assets and liabilities carried at fair value on a recurring basis at December 31, 2012 for continuing operations are summarized in the following table:(dollars in thousands) Total Level 1 Level 2 Level 3Assets:        Available-for-sale debt securities:        U.S. Treasury and government agencies $6,981 $— $6,981 $—U.S. government sponsored agencies 22,173 — 22,173 —States and political subdivisions 6,038 — 6,038 —Residential mortgage-backed securities-GSE 441,074 — 441,074 —Residential mortgage-backed securities-Private 22,945 — 22,945 —Commercial mortgage-backed securities-GSE 23,359 — 23,359 —Commercial mortgage-backed securities-Private 5,317 — 5,317 —Corporate notes 36,963 — 36,963 —Total available-for-sale debt securities 564,850 — 564,850 —Mortgage servicing rights 726 — — 726Total assets at fair value from continuing operations $565,576 $— $564,850 $726                                                                                                                                                                                       |
| Fair Value Measurements, Nonrecurring                                                            | Assets measured at fair value on a nonrecurring basis are included in the following table at September 30, 2013 for continuing operations:(dollars in thousands) Total Level 1 Level 2 Level 3Impaired loans, net $2,477 $— $— $2,477Other real estate owned 25,271 — — 25,271Total assets at fair value from continuing operations $27,748 $— $— $27,748Assets measured at fair value on a nonrecurring basis are included in the following table at December 31, 2012 for continuing operations:(dollars in thousands) Total Level 1 Level 2 Level 3Impaired loans, net $13,575 $— $— $13,575Other real estate owned 48,480 — — 48,480Total assets at fair value from continuing operations $62,055 $— $— $62,055                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                            |
| Fair Value, by Balance Sheet Grouping                                                            | The estimated fair values of financial instruments for continuing operations are as follows at the periods indicated:  At September 30, 2013(dollars in thousands) Carrying Value Estimated Fair Value Level 1 Level 2 Level 3Financial Assets of Continuing Operations:          Cash and cash equivalents $103,074 $103,074 $103,074 $— $—Investment securities:  Available-for-sale 439,712 439,712 2,640 437,072 —Investment securities:  Held-to-maturity 153,684 146,474 — 146,474 —Loans held for sale 2,734 2,734 — 2,734 —Loans, net 1,169,755 1,137,425 — — 1,137,425Accrued interest receivable 6,527 6,527 — 1,735 4,792Financial Liabilities of Continuing Operations:          Deposits 1,790,608 1,791,409 — 1,791,409 —Retail repurchase agreements 12,422 12,422 — 12,422 —Federal Home Loan Bank advances 73,295 77,010 — 77,010 —Long term notes payable 5,244 5,244 — — 5,244Junior subordinated debentures 56,702 21,818 — — 21,818Accrued interest payable 2,410 2,410 — 439 1,971  At December 31, 2012(dollars in thousands) Carrying Value Estimated Fair Value Level 1 Level 2 Level 3Financial Assets of Continuing Operations:          Cash and cash equivalents $239,610 $239,610 $239,610 $— $—Investment securities:  Available-for-sale 564,850 564,850 — 564,850 —Loans held for sale 6,974 6,974 — 6,974 —Loans, net 1,147,721 1,140,088 — — 1,140,088Accrued interest receivable 6,102 6,102 — 1,812 4,290Financial Liabilities of Continuing Operations:          Deposits 1,906,988 1,910,927 — 1,910,927 —Retail repurchase agreements 8,675 8,675 — 8,675 —Federal Home Loan Bank advances 58,328 62,950 — 62,950 —Junior subordinated debentures 56,702 18,760 — — 18,760Accrued interest payable 2,111 2,111 — 937 1,174 |

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| - Definition
Tabular disclosure of the inputs and valuation techniques used to measure fair value, and a discussion of changes in valuation techniques and related inputs, if any, applied during the period to each separate class of assets, liabilities, and financial instruments classified in shareholders' equity that are measured on a recurring and/or nonrecurring basis.
+ References
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| - Definition
Tabular disclosure of assets and liabilities by class, including financial instruments measured at fair value that are classified in shareholders' equity, if any, that are measured at fair value on a nonrecurring basis in periods after initial recognition (for example, impaired assets). Disclosures may include, but are not limited to: (a) the fair value measurements recorded and the reasons for the measurements and (b) the level within the fair value hierarchy in which the fair value measurements are categorized in their entirety (levels 1, 2, 3).
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| - Definition
Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.
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| - Definition
Tabular disclosure of the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such certain disclosures about the financial instruments, assets, and liabilities include: (1) the fair value of the required items together with their carrying amounts (as appropriate) and (2) the methodology and assumptions used in developing such estimates of fair value.
+ References
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| - Definition
Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).
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