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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, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Tax provision at statutory rate		$ 23,709	$ 14,746	$ 14,405
Increase (decrease) in income taxes resulting from:
Tax-exempt interest income		(1,461)	(1,202)	(930)
Low income housing tax credits		(596)	(192)	(191)
Non-deductible interest expense		24	16	11
State income taxes, net of federal benefit		1,780	1,158	1,152
Change in valuation allowance		(1)	(24)	(58)
Impact of tax reform		(1,269)
Other, net		(419)	122	(263)
Income tax expense (benefit)	$ 1,300	$ 21,767	$ 14,624	$ 14,126

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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