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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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