Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Before Tax Amount
Other comprehensive loss, net	$ (12,542)	$ (26,961)	$ (2,416)	$ (69,101)
Tax Benefit
Other comprehensive loss, net	3,415	7,125	745	18,165
Net of Tax Amount
Other comprehensive loss, net of tax	(9,127)	(19,836)	(1,671)	(50,936)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member]
Before Tax Amount
Unrealized losses on available for sale securities arising during the period	(12,368)	(26,758)	(2,070)	(68,722)
Tax Benefit
Unrealized losses on available for sale securities arising during the period	3,368	7,070	652	18,069
Net of Tax Amount
Net current period other comprehensive loss	(9,000)	(19,688)	(1,418)	(50,653)
Other comprehensive loss, net of tax	(9,000)	(19,688)	(1,418)	(50,653)
Amortization of Gain on Debt Securities Reclassified to Held to Maturity
Before Tax Amount
Other comprehensive loss, net	(174)	(203)	(346)	(379)
Tax Benefit
Other comprehensive loss, net	47	55	93	96
Net of Tax Amount
Other comprehensive loss, net of tax	$ (127)	$ (148)	$ (253)	$ (283)