Income Taxes (Provision For 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, 2018	Dec. 31, 2017	Dec. 31, 2016
Current:
Federal									$ 5,975	$ 8,139	$ 7,407
State and local									688	636	409
Total									6,663	8,775	7,816
Deferred:
Federal									(458)	335	1,114
State and local									(1,143)	779	119
Total deferred income tax expense (benefit)									(1,601)	1,114	1,233
Total income tax expense (benefit)	$ 1,831	$ 535	$ 1,739	$ 957	$ 1,066	$ 3,345	$ 2,581	$ 2,897	$ 5,062	$ 9,889	$ 9,049