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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Components of the provision for income taxes [Abstract]      
Current income tax expense $ 14,784 $ 16,905 $ 14,393
Deferred income tax expense (benefit) 5,441 (94) 219
Total income tax expense 20,225 16,811 14,612
Reconciliation of income tax expense at the statutory rate to actual income tax expense [Abstract]      
Computed at the statutory rate 22,781 19,602 16,818
Adjustments resulting from [Abstract]      
Tax-exempt interest (1,278) (948) (806)
Housing and new markets credits (704) (1,007) (507)
Dividends received deduction (202) (183) (172)
Bank owned life insurance (470) (470) (477)
ESOP dividend deduction (271) (262) (245)
Other, net 369 79 1
Total 20,225 16,811 14,612
Reconciliation of income tax expense at the statutory rate to actual income tax expense (in hundredths) [Abstract]      
Computed at the statutory rate (in hundredths) 35.00% 35.23% 35.71%
Decrease Resulting from: [Abstract]      
Tax-exempt interest (in hundredths) (1.96%) (1.70%) (1.71%)
Housing and new markets credits (in hundredths) (1.08%) (1.81%) (1.08%)
Dividends received deduction (in hundredths) (0.31%) (0.33%) (0.36%)
Bank owned life insurance (in hundredths) (0.72%) (0.85%) (1.01%)
ESOP dividend deduction (in hundredths) (0.42%) (0.47%) (0.53%)
Other, net (in hundredths) 0.56% 0.14% 0.01%
Total 31.07% 30.21% 31.03%
Deferred tax assets: [Abstract]      
Allowance for loan and lease losses 11,561 11,610  
Interest on nonperforming loans 841 883  
Accrued expenses 1,456 356  
Dealer reserve valuation 0 982  
Allowance for Other Real Estate Owned 3,269 3,964  
Write-down of auction rate securities 0 3,969  
Other 663 317  
Total deferred tax assets 17,790 22,081  
Deferred tax liabilities: [Abstract]      
Depreciation and amortization (18,091) (16,852)  
FHLB stock dividends (4,956) (4,956)  
Loan fee income (842) (1,092)  
Mortgage servicing rights (827) (799)  
Capitalized lease obligations (850) (766)  
Unrealized gains on AFS securities (7,424) (6,088)  
Other (1,077) (1,028)  
Total deferred tax liabilities (34,067) (31,581)  
Net deferred tax liability $ (16,277) $ (9,500)