Comprehensive Income - Components of Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Before Tax Amount
Other comprehensive (loss) income, net	$ (38,224)	$ 1,656	$ (107,325)	$ (7,117)
Tax Benefit (Expense)
Other comprehensive (loss) income, net	10,115	(487)	28,280	2,234
Net of Tax Amount
Amounts reclassified from accumulated other comprehensive income				(6)
Other comprehensive loss, net of tax	(28,109)	1,169	(79,045)	(4,883)
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	(38,037)	(2,008)	(106,759)	(10,907)
Reclassification adjustment for securities gains arising during the period			0	(9)
Other comprehensive (loss) income, net			(106,759)	(10,916)
Tax Benefit (Expense)
Unrealized losses on available for sale securities arising during the period	10,065	504	28,134	3,387
Reclassification adjustment for securities gains arising during the period			0	3
Other comprehensive (loss) income, net			28,134	3,390
Net of Tax Amount
Net current period other comprehensive loss	(27,972)	(1,504)	(78,625)	(7,520)
Amounts reclassified from accumulated other comprehensive income			0	(6)
Other comprehensive loss, net of tax	(27,972)		(78,625)	(7,526)
Net gain on securities reclassified from available for sale to held to maturity
Before Tax Amount
Other comprehensive (loss) income, net	0	3,814	0	3,814
Tax Benefit (Expense)
Other comprehensive (loss) income, net	0	(1,030)	0	(1,030)
Net of Tax Amount
Other comprehensive loss, net of tax	0	2,784	0	2,784
Amortization of Gain on Debt Securities Reclassified to Held to Maturity
Before Tax Amount
Other comprehensive (loss) income, net	(187)	(158)	(566)	(158)
Tax Benefit (Expense)
Other comprehensive (loss) income, net	50	42	146	42
Net of Tax Amount
Net current period other comprehensive loss		(116)		(116)
Amounts reclassified from accumulated other comprehensive income				0
Other comprehensive loss, net of tax	(137)	(116)	(420)	(116)
Unrealized gains on derivatives
Before Tax Amount
Other comprehensive (loss) income, net	0	8	0	143
Tax Benefit (Expense)
Other comprehensive (loss) income, net	0	(3)	0	(168)
Net of Tax Amount
Net current period other comprehensive loss		5		(25)
Amounts reclassified from accumulated other comprehensive income				0
Other comprehensive loss, net of tax	$ 0	$ 5	$ 0	$ (25)