Income Taxes (Provision for Income Taxes) (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 tax provision
Federal									$ 6,340	$ 2,875	$ 812
State									157	185
Total current tax provision									6,497	3,060	812
Deferred tax (benefit) expense
Federal									(1,367)	665	1,317
Total deferred tax expense									(1,367)	665	1,317
Provision for income taxes	$ 1,909	$ 889	$ 1,682	$ 650	$ 1,186	$ 709	$ 980	$ 850	$ 5,130	$ 3,725	$ 2,129