| **Fair Values of Assets and Liabilities (Tables)**                                               | 12 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 reconciliations 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 MeasurementsUsing SignificantUnobservable Inputs(Level 3)(dollars in thousands)Mortgage Servicing RightsBeginning balance at January 1, 2012$—Total gains or losses (realized/unrealized): Included in earnings, net of amortization726Purchases, issuances and settlements—Servicing rights sold—Ending balance at December 31, 2012$726  Fair Value MeasurementsUsing SignificantUnobservable Inputs(Level 3)(dollars in thousands)Mortgage Servicing RightsBeginning balance at January 1, 2011$2,359Total gains or losses (realized/unrealized): Included in earnings, net of amortization(117)Purchases, issuances and settlements—Servicing rights sold(2,242)Ending balance at December 31, 2011$—                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
| Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques                        | Quantitative Information about Level 3 Fair Value Measurements(dollars in thousands) Fair Value atDecember 31, 2012 Valuation Techniques UnobservableInput RangeNonrecurring measurements:        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 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 $726Assets and liabilities carried at fair value on a recurring basis at December 31, 2011 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 $7,188 $— $7,188 $—U.S. government sponsored agencies 32,364 — 32,364 —States and political subdivisions 6,090 — 6,090 —Residential mortgage-backed securities-GSE 350,273 — 350,273 —Residential mortgage-backed securities-Private 32,217 — 32,217 —Corporate notes 3,174 — 3,174 —Total available-for-sale debt securities 431,306 — 431,306 —Total assets at fair value from continuing operations $431,306 $— $431,306 $—                                                                                                              |
| Fair Value Measurements, Nonrecurring                                                            | December 31, 2011 (dollars in thousands) Total Level 1 Level 2 Level 3Loans held for sale $4,529 $— $4,529 $—Impaired loans, net 31,266 — — 31,266Purchased impaired loans 308,594 — — 308,594Purchased contractual loans 65,283 — — 65,283Other real estate owned 84,794 — — 84,794Total assets at fair value from continuing operations $494,466 $— $4,529 $489,937Assets measured at fair value on a nonrecurring basis are included in the following tables, for the periods indicated, for continuing operations:December 31, 2012 (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 at December 31 are as follows:   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 — 6,102 —Financial 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 — 2,111 —  At December 31, 2011(dollars in thousands) Carrying Value Estimated Fair Value Level 1 Level 2 Level 3Financial Assets of Continuing Operations:          Cash and cash equivalents 553,416 553,416 553,416 — —Investment securities:  Available-for-sale 431,306 431,306 — 431,306 —Loans held for sale 4,529 4,529 — 4,529 —Loans, net 1,178,175 1,176,795 — — 1,176,795Accrued interest receivable 5,919 5,919 — 5,919 —Financial Liabilities of Continuing Operations:          Deposits 2,129,111 2,139,093 — 2,139,093 —Retail repurchase agreements 8,838 8,838 — 8,838 —Federal Home Loan Bank advances 58,370 62,555 — 62,555 —Junior subordinated debentures 56,702 36,218 — — 36,218Accrued interest payable 1,654 1,654 — 1,654 — |
| Discontinued operations [Member]                                                                 |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| **Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| Fair Value Measurements, Nonrecurring                                                            | Assets measured at fair value on a nonrecurring basis are included in the following table for discontinued operations:December 31, 2011 (dollars in thousands) Total Level 1 Level 2 Level 3Loans held for sale $233 $— $233 $—Total assets at fair value from discontinued operations $233 $— $233 $—                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         |
| Fair Value, by Balance Sheet Grouping                                                            | The estimated fair values of financial instruments for discontinued operations are as follows:   As of December 31, 2012 As of December 31, 2011(dollars in thousands) CarryingValue EstimatedFair Value CarryingValue EstimatedFair ValueFinancial Assets of Discontinued Operations $— $— $233 $233                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       |

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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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