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Income Taxes (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Components of the provision for income taxes [Abstract] |  |  |  |
Current income tax expense |  | $ 20,108 | $ 18,417 | $ 18,416
Deferred income tax expense |  | (259) | 701 | 115
Effect of Tax Cuts & Jobs Act (benefit) |  | (2,831) | 0 | 0
Total income tax expense |  | $ 17,018 | $ 19,118 | $ 18,531
Federal corporate tax rate |  | 35.00% | 35.00% | 35.00%
Reconciliation of income tax expense at the statutory rate to actual income tax expense [Abstract] |  |  |  |
Computed at the statutory rate |  | $ 23,979 | $ 23,262 | $ 22,737
Adjustments resulting from [Abstract] |  |  |  |
Tax-exempt interest |  | (1,259) | (1,289) | (1,275)
Housing and new markets credits |  | (2,579) | (2,680) | (2,692)
Dividends received deduction |  | (129) | (136) | (128)
Bank owned life insurance |  | (492) | (518) | (549)
ESOP dividend deduction |  | (319) | (313) | (298)
Stock option exercises and restricted stock vesting |  | (170) | 0 | 0
Effect of Tax Cuts & Jobs Act (benefit) |  | (2,831) | 0 | 0
Other, net |  | 818 | 792 | 736
Total income tax expense |  | $ 17,018 | $ 19,118 | $ 18,531
Reconciliation of income tax expense at the statutory rate to actual income tax expense [Abstract] |  |  |  |
Computed at the statutory rate |  | 35.00% | 35.00% | 35.00%
Adjustment resulting from [Abstract] |  |  |  |
Tax-exempt interest |  | (1.84%) | (1.94%) | (1.96%)
Housing and new markets credits |  | (3.76%) | (4.03%) | (4.14%)
Dividends received deduction |  | (0.19%) | (0.20%) | (0.20%)
Bank owned life insurance |  | (0.72%) | (0.78%) | (0.84%)
ESOP dividend deduction |  | (0.47%) | (0.47%) | (0.46%)
Stock option exercises and restricted stock vesting |  | (0.25%) | 0.00% | 0.00%
Effect of Tax Cuts & Jobs Act |  | (4.13%) | 0.00% | 0.00%
Other, net |  | 1.20% | 1.18% | 1.13%
Total |  | 24.84% | 28.76% | 28.53%
Deferred tax assets [Abstract] |  |  |  |
Allowance for loan and lease losses |  | $ 7,592 | $ 12,577 |
Interest on nonperforming loans |  | 560 | 806 |
Accrued expenses |  | 442 | 1,883 |
Allowance for other real estate owned |  | 1,322 | 1,898 |
Limited partnership investments |  | 64 | 0 |
Unrealized losses on AFS securities |  | 932 | 1,241 |
Other |  | 204 | 282 |
Total deferred tax assets |  | 11,116 | 18,687 |
Deferred tax liabilities [Abstract] |  |  |  |
Depreciation and amortization |  | (12,270) | (20,287) |
FHLB stock dividends |  | (2,076) | (3,460) |
Loan fee income |  | (263) | (536) |
Mortgage servicing rights |  | (732) | (1,202) |
Capitalized lease obligations |  | (14) | (65) |
Limited partnership investments |  | 0 | (411) |
Other |  | (195) | (562) |
Total deferred tax liabilities |  | (15,550) | (26,523) |
Net deferred tax liability |  | $ (4,434) | $ (7,836) |
Plan [Member] |  |  |  |
Components of the provision for income taxes [Abstract] |  |  |  |
Federal corporate tax rate | 21.00% |  |  |
Reconciliation of income tax expense at the statutory rate to actual income tax expense [Abstract] |  |  |  |
Computed at the statutory rate | 21.00% |  |  |

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