Accumulated Other Comprehensive Income (Loss) - Schedule of Changes in Accumulated Other Comprehensive Income (Loss) by Component Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized holding loss on available-for-sale securities arising during the period, Pretax	$ (6,538)	$ (3,607)
Beginning balance, After-tax	(2,125)
Other comprehensive loss	(5,088)	(2,836)
Ending Balance, After-tax	(7,213)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, Pretax	(2,691)	1,249
Unrealized holding loss on available-for-sale securities arising during the period, Pretax	(6,538)	(3,607)
Amortization of held-to-maturity discount resulting from transfer, Pretax	98	16
Total other comprehensive loss, Pretax	(6,440)	(3,591)
Ending balance, Pretax	(9,131)	(2,342)
Beginning balance, Tax Effect	566	(263)
Unrealized holding loss on available-for-sale securities arising during the period, Tax Effect	1,373	758
Amortization of held-to-maturity discount resulting from transfer, Tax Effect	(21)	(3)
Total other comprehensive loss, Tax Effect	1,352	755
Ending Balance, Tax Effect	1,918	492
Beginning balance, After-tax	(2,125)	986
Unrealized holding loss on available-for-sale securities arising during the period, After-Tax	(5,165)	(2,849)
Amortization of held-to-maturity discount resulting from transfer, After-tax	77	13
Other comprehensive loss	(5,088)	(2,836)
Ending Balance, After-tax	$ (7,213)	$ (1,850)