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Income Taxes - Reconciliation Of Actual To Expected Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Computed “expected” income tax expense									$ 5,056	$ 8,330	$ 7,365
State income taxes, net									720	1,225	384
Tax-exempt interest on investment securities									(307)	(597)	(566)
Amortization of investment in low income housing tax credit partnerships									2,691	2,276	2,868
Low income housing credits									(2,821)	(3,468)	(3,540)
Revaluation of deferred tax assets									(470)	2,678	0
Other									(798)	(123)	(459)
Total	$ 907	$ 1,129	$ 1,167	$ 868	$ 4,085	$ 2,980	$ 1,455	$ 1,801	$ 4,071	$ 10,321	$ 6,052

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