Comprehensive Income (Loss) - Accumulated Other Comprehensive Income (loss) (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	$ 49,441	$ 37,397
Total other comprehensive income (loss)	(1,113)	4,546
Ending balance	50,403	41,843
Unrealized Holding Gains on Available-for-Sale Securities (Net) [Member]
Accumulated Other Comprehensive Income Loss [Line Items]
Beginning balance	(25,100)	(31,765)
Other comprehensive income (loss) before reclassifications, net of $332 and ($1,359) tax effect, respectively	(1,113)	4,505
Amounts reclassified from accumulated other comprehensive loss, net of $0 and ($10) tax effect, respectively		41
Total other comprehensive income (loss)	(1,113)	4,546
Ending balance	$ (26,213)	$ (27,219)