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Income Taxes (Schedule of Effective Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Tax provision at statutory rate	$ 24,418	$ 23,830	$ 23,709
Increase (decrease) in income taxes resulting from:
Tax-exempt interest income	(1,186)	(1,117)	(1,461)
Low income housing tax credits	(756)	(698)	(596)
Non-deductible interest expense	43	27	24
State income taxes, net of federal benefit	2,178	2,639	1,780
Change in valuation allowance	4	(8)	(1)
Impact of tax reform	(73)	0	(1,269)
Other, net	(398)	(484)	(419)
Income tax expense (benefit)	$ 24,230	$ 24,189	$ 21,767

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