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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Components of the provision for income taxes [Abstract]      
Current income tax expense $ 19,418 $ 14,784 $ 16,905
Deferred income tax expense (benefit) 582 5,441 (94)
Total income tax expense 20,000 20,225 16,811
Reconciliation of income tax expense at the statutory rate to actual income tax expense [Abstract]      
Computed at the statutory rate 22,810 22,781 19,602
Adjustments resulting from [Abstract]      
Tax-exempt interest (1,126) (1,278) (948)
Housing and new markets credits (996) (704) (1,007)
Dividends received deduction (291) (202) (183)
Bank owned life insurance (791) (470) (470)
ESOP dividend deduction (281) (271) (262)
Other, net 675 369 79
Total 20,000 20,225 16,811
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% 35.00% 35.23%
Adjustment Resulting from: [Abstract]      
Tax-exempt interest (in hundredths) (1.73%) (1.96%) (1.70%)
Housing and new markets credits (in hundredths) (1.52%) (1.08%) (1.81%)
Dividends received deduction (in hundredths) (0.45%) (0.31%) (0.33%)
Bank owned life insurance (in hundredths) (1.22%) (0.72%) (0.85%)
ESOP dividend deduction (in hundredths) (0.43%) (0.42%) (0.47%)
Other, net (in hundredths) 1.04% 0.56% 0.14%
Total 30.69% 31.07% 30.21%
Deferred tax assets: [Abstract]      
Allowance for loan and lease losses 11,820 11,561  
Interest on nonperforming loans 732 841  
Accrued expenses 3,370 1,456  
Allowance for other real estate owned 2,232 3,269  
Unrealized losses on available-for-sale securities 3,717 0  
Other 232 663  
Total deferred tax assets 22,103 17,790  
Deferred tax liabilities: [Abstract]      
Depreciation and amortization (18,717) (18,091)  
FHLB stock dividends (4,956) (4,956)  
Loan fee income (724) (842)  
Mortgage servicing rights (1,198) (827)  
Capitalized lease obligations (1,145) (850)  
Unrealized gains on AFS securities 0 (7,424)  
Other (1,015) (1,077)  
Total deferred tax liabilities (27,755) (34,067)  
Net deferred tax liability $ (5,652) $ (16,277)