Comprehensive Income (Loss) - Summary of Changes in Components of Other Comprehensive Income, Net of Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	$ 1,169,369	$ 1,108,587
Other comprehensive income, net of tax	(1,069)	7,456
Balance at end of period	1,179,430	1,126,580
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(64,080)	(74,761)
Other comprehensive income, net of tax	(1,069)	7,456
Balance at end of period	(65,149)	(67,305)
Unrealized Losses on Available for  Sale Securities
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	(65,570)	(76,729)
Other comprehensive income, net of tax	(963)	7,582
OCI, before Reclassifications, Net of Tax, Attributable to Parent	(963)	7,582
Balance at end of period	(66,533)	(69,147)
Amortization of gain on debt securities reclassified to held to maturity from available for sale
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance at beginning of period	1,490	1,968
Other comprehensive income, net of tax	(106)	(126)
Balance at end of period	$ 1,384	$ 1,842