Income Taxes - Summary of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal	$ 8,806	$ 7,412	$ 5,080
State	1,381	408	89
Current income tax expense	10,187	7,820	5,169
Deferred:
Federal	(774)	(824)	6,310
State	3,433	(289)	(2,271)
Deferred income taxes	2,659	(1,113)	4,039
Total provision	$ 12,846	$ 6,707	$ 9,208