Income Taxes (Schedule of Allocation of Federal and State Income Taxes) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Current
Federal													$ 2,810	$ 5,584	$ 3,675
State													1,653	1,686	1,296
Current income tax expense (benefit), total													4,463	7,270	4,971
Deferred
Federal													(202)	1,894	(460)
State													(88)	(7)	(95)
Deferred income tax expense (benefit), total													(290)	1,887	(555)
Income tax expense (benefit), total	$ 1,371	$ 1,441	$ 828	$ 533	$ 4,456	$ 1,717	$ 1,536	$ 1,448	$ 1,356	$ 1,014	$ 1,078	$ 968	$ 4,173	$ 9,157	$ 4,416