Income Taxes (Components of 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
Current:
Federal									$ 6,456	$ 6,825	$ 7,189
State									941	1,290	1,191
Deferred:
Federal									301	(84)	(585)
State									18	(53)	(36)
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