Income Taxes (Schedule of Reconciliation of Expected Income Tax Expense (Benefit)) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Expected income tax expense									$ 11,223	$ 10,862	$ 11,127
(Reductions) increases resulting from:
Tax-exempt income									(3,754)	(3,704)	(3,896)
State taxes, net of federal benefit									623	804	751
Other, net									(376)	16	(223)
Total income tax expense	$ 1,806	$ 1,855	$ 2,035	$ 2,020	$ 2,017	$ 2,083	$ 1,932	$ 1,946	$ 7,716	$ 7,978	$ 7,759