Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ 60,787	$ 59,237
Total other comprehensive loss	(14,037)	(3,772)
Ending balance	47,158	59,826
Unrealized Holding Gains on Available-for-Sale Securities (Net) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(1,151)	4,160
Other comprehensive income (loss) before reclassifications, net of $4,213 and $937 tax effect, respectively	(14,109)	(3,022)
Amounts reclassified from accumulated other comprehensive income, net of ($19) and $190 tax effect, respectively	72	(750)
Total other comprehensive loss	(14,037)	(3,772)
Ending balance	$ (15,188)	$ 388