Income Taxes - Summary of Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current:
Federal	$ 2,943	$ 8,806	$ 7,412
State	396	1,381	408
Current income tax expense	3,339	10,187	7,820
Deferred:
Federal	4,156	(774)	(824)
State	1,336	3,433	(289)
Deferred income taxes	5,492	2,659	(1,113)
Total provision	$ 8,831	$ 12,846	$ 6,707

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