Accumulated Other Comprehensive Loss - Schedule of Changes in Accumulated Other Comprehensive Loss by Component Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Accumulated Other Comprehensive Loss [Line Items]
Unrealized holding gain (loss) on available-for-sale securities arising during the period, Pretax	$ 1,327	$ (6,538)
Beginning balance, After-tax	(12,919)
Other comprehensive income (loss)	1,084	(5,088)
Ending Balance, After-tax	(11,835)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Loss [Line Items]
Beginning balance, Pretax	(16,354)	(2,691)
Unrealized holding gain (loss) on available-for-sale securities arising during the period, Pretax	1,327	(6,538)
Amortization of held-to-maturity discount resulting from transfer, Pretax	46	98
Total other comprehensive income (loss), Pretax	1,373	(6,440)
Ending balance, Pretax	(14,981)	(9,131)
Beginning balance, Tax Effect	3,435	566
Unrealized holding gain (loss) on available-for-sale securities arising during the period, Tax Effect	(279)	1,373
Amortization of held-to-maturity discount resulting from transfer, Tax Effect	(10)	(21)
Total other comprehensive income (loss), Tax Effect	(289)	1,352
Ending Balance, Tax Effect	3,146	1,918
Beginning balance, After-tax	(12,919)	(2,125)
Unrealized holding gain (loss) on available-for-sale securities arising during the period, After-Tax	1,048	(5,165)
Amortization of held-to-maturity discount resulting from transfer, After-tax	36	77
Other comprehensive income (loss)	1,084	(5,088)
Ending Balance, After-tax	$ (11,835)	$ (7,213)