Income Taxes - Income Tax Provision (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Federal
Current expense, federal	$ 21,017	$ 15,553	$ 10,164
Tax credits/true-up, federal	(4,979)	(5,610)	(3,633)
Change in deferred expense/(benefit), federal	818	594	1,787
Income tax expense, federal	16,856	10,537	8,318
State
Current expense, state	3,520	3,347	2,936
Tax credits/true-up, state	(138)	(135)	(30)
Change in deferred expense/(benefit), state	86	61	84
Income tax expense, state	3,468	3,273	2,990
Current expense, total	24,537	18,900	13,100
Tax credits/true-up, total	(5,117)	(5,745)	(3,663)
Change in deferred expense/(benefit), total	904	655	1,871
Total provision	$ 20,324	$ 13,810	$ 11,308