Income Taxes - Components of income tax expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current Federal income tax expense	$ 5,747	$ 3,995	$ 1,188
Current State income tax expense (benefit)	3,351	2,689	1,224
Total current income tax expense	9,098	6,684	2,412
Deferred Federal income tax expense (benefit)	(387)	(140)	3,328
Deferred State income tax expense (benefit)	(202)	76	518
Total deferred income tax expense (benefit)	(589)	(64)	3,846
Effective Income Tax Rate Reconciliation Tax Cuts And Jobs Act Of 2017 Amount			3,535
Remeasurement resulting from Tax Act			3,535
Provision (benefit) from income taxes, Federal	5,360	3,855	8,051
Provision (benefit) from income taxes, State	3,149	2,765	1,742
Provision for income taxes	$ 8,509	$ 6,620	$ 9,793