Income Taxes - Components of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current expense:
Federal	$ 11,305	$ 7,728	$ 6,485
State	4,542	3,028	2,835
Total current expense	15,847	10,756	9,320
Deferred benefit:
Federal	(3,940)	(339)	(392)
State	(1,735)	(36)	(112)
Total deferred benefit	(5,675)	(375)	(504)
Total income tax expense	$ 10,172	$ 10,381	$ 8,816