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Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Components of the provision for income taxes, exclusive of tax effect of unrealized AFS securities gains and losses [Abstract]
Current income tax expense	$ 11,560	$ 20,108	$ 18,417
Deferred income tax expense (benefit)	(246)	(259)	701
Effect of Tax Cuts & Jobs Act (benefit)	0	(2,831)	0
Total income tax expense	$ 11,314	$ 17,018	$ 19,118
Federal corporate income tax rate	21.00%	35.00%	35.00%
Reconciliation of income tax expense at the statutory rate to actual income tax expense [Abstract]
Computed at the statutory rate	$ 14,814	$ 23,979	$ 23,262
Adjustments resulting from [Abstract]
Tax-exempt interest	(673)	(1,259)	(1,289)
Housing and new markets credits	(2,635)	(2,579)	(2,680)
Dividends received deduction	(9)	(129)	(136)
Bank owned life insurance	(599)	(492)	(518)
ESOP dividend deduction	(188)	(319)	(313)
Stock option exercises and restricted stock vesting	(39)	(170)	0
Effect of Tax Cuts & Jobs Act	0	(2,831)	0
Other, net	643	818	792
Total income tax expense	$ 11,314	$ 17,018	$ 19,118
Reconciliation of income tax expense at the statutory rate to actual income tax expense [Abstract]
Computed at the statutory rate	21.00%	35.00%	35.00%
Adjustment resulting from [Abstract]
Tax-exempt interest	(0.95%)	(1.84%)	(1.94%)
Housing and new markets credits	(3.73%)	(3.76%)	(4.03%)
Dividends received deduction	(0.01%)	(0.19%)	(0.20%)
Bank owned life insurance	(0.85%)	(0.72%)	(0.78%)
ESOP dividend deduction	(0.27%)	(0.47%)	(0.47%)
Stock option exercises and restricted stock vesting	(0.06%)	(0.25%)	0.00%
Effect of Tax Cuts & Jobs Act	(0.00%)	(4.13%)	0.00%
Other, net	0.91%	1.20%	1.18%
Total	16.04%	24.84%	28.76%
Deferred tax assets [Abstract]
Allowance for loan and lease losses	$ 7,541	$ 7,592
Interest on nonperforming loans	531	560
Accrued expenses	1,093	442
Allowance for other real estate owned	1,435	1,322
Limited partnership investments	0	64
Unrealized losses on AFS securities	1,757	932
Other	164	204
Total deferred tax assets	12,521	11,116
Deferred tax liabilities [Abstract]
Depreciation and amortization	(12,210)	(12,270)
FHLB stock dividends	(1,704)	(2,076)
Loan fee income	(419)	(263)
Mortgage servicing rights	(757)	(732)
Capitalized lease obligations	0	(14)
Limited partnership investments	(257)	0
Other	(537)	(195)
Total deferred tax liabilities	(15,884)	(15,550)
Net deferred tax liability	$ (3,363)	$ (4,434)

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