Accumulated Other Comprehensive Loss - Schedule of Changes in Accumulated Other Comprehensive (Loss) Income by Component Net of Tax (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Unrealized holding (loss) gain on available-for-sale securities arising during the period, Pretax	$ 3,168	$ (13,952)
Beginning balance, After-tax	(12,919)
Other comprehensive income (loss)	2,649	(10,794)
Ending Balance, After-tax	(10,270)	(12,919)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, Pretax	(16,354)	(2,691)
Unrealized holding (loss) gain on available-for-sale securities arising during the period, Pretax	3,168	(13,952)
Amortization of held-to-maturity discount resulting from transfer, Pretax	187	289
Total other comprehensive income (loss), Pretax	3,355	(13,663)
Ending balance, Pretax	(12,999)	(16,354)
Beginning balance, Tax Effect	3,435	566
Unrealized holding (loss) gain on available-for-sale securities arising during the period, Tax Effect	(666)	2,930
Amortization of held-to-maturity discount resulting from transfer, Tax Effect	(40)	(61)
Total other comprehensive income (loss), Tax Effect	(706)	2,869
Ending Balance, Tax Effect	2,729	3,435
Beginning balance, After-tax	(12,919)	(2,125)
Unrealized holding (loss) gain on available-for-sale securities arising during the period, After-Tax	2,502	(11,022)
Amortization of held-to-maturity discount resulting from transfer, After-tax	147	228
Other comprehensive income (loss)	2,649	(10,794)
Ending Balance, After-tax	$ (10,270)	$ (12,919)