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Income Taxes (Schedule of Effective Tax Rate Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Tax provision at statutory rate		$ 23,830	$ 23,709	$ 14,746
Increase (decrease) in income taxes resulting from:
Tax-exempt interest income		(1,117)	(1,461)	(1,202)
Low income housing and AMT tax credits		(698)	(596)	(192)
Non-deductible interest expense		27	24	16
State income taxes, net of federal benefit		2,639	1,780	1,158
Change in valuation allowance		(8)	(1)	(24)
Impact of tax reform			(1,269)
Other, net		(484)	(419)	122
Income tax expense (benefit)	$ 1,300	$ 24,189	$ 21,767	$ 14,624

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