Income Taxes (Schedule of Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal									$ 15,197	$ 11,876	$ 14,102
State									1,474	1,241	1,206
Total									16,671	13,117	15,308
Deferred:
Federal									(1,720)	1,230	(2,541)
Deferred State and Local Income Tax Expense (Benefit)									(41)	29	(61)
Deferred Income Tax Expense (Benefit)									(1,761)	1,259	(2,602)
Income tax expense	$ 4,564	$ 4,194	$ 2,752	$ 3,400	$ 3,921	$ 3,696	$ 3,275	$ 3,484	$ 14,910	$ 14,376	$ 12,706