Comprehensive Income (Loss) - Components of Other Comprehensive Income (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Before Tax Amount
Other comprehensive income (loss)	$ 14,302	$ (106,009)	$ (11,509)
Tax Benefit (Expense)
Other comprehensive income (loss)	(3,621)	27,984	3,376
Net of Tax Amount
Reclassification adjustment for securities gains included in net income			(6)
Other comprehensive income (loss)	10,681	(78,025)	(8,133)
Unrealized Gains (Losses)  on Available- for-Sale Securities
Before Tax Amount
Unrealized holding losses on securities available for sale arising during the period		(105,262)	(15,117)
Reclassification adjustment for securities gains included in net income			(9)
Other comprehensive income (loss)	14,956		(15,126)
Tax Benefit (Expense)
Unrealized holding losses on securities available for sale		27,788	4,466
Reclassification adjustment for securities gains included in net income			3
Other comprehensive income (loss)	(3,797)		4,469
Net of Tax Amount
Other comprehensive (loss) income before reclassifications		(77,474)	(10,651)
Reclassification adjustment for securities gains included in net income			(6)
Other comprehensive income (loss)	11,159		(10,657)
Net gain on securities reclassified from available for sale to held to maturity
Before Tax Amount
Other comprehensive income (loss)			3,814
Tax Benefit (Expense)
Other comprehensive income (loss)			(1,030)
Net of Tax Amount
Other comprehensive income (loss)			2,784
Amortization of gain on debt securities reclassified to held to maturity from available for sale
Before Tax Amount
Other comprehensive income (loss)	(654)	(747)	(383)
Tax Benefit (Expense)
Other comprehensive income (loss)	176	196	118
Net of Tax Amount
Other comprehensive (loss) income before reclassifications			(265)
Reclassification adjustment for securities gains included in net income			0
Other comprehensive income (loss)	(478)	(551)	(265)
Unrealized gains on derivatives
Before Tax Amount
Other comprehensive income (loss)			143
Tax Benefit (Expense)
Other comprehensive income (loss)			(168)
Net of Tax Amount
Other comprehensive (loss) income before reclassifications			(25)
Reclassification adjustment for securities gains included in net income			0
Other comprehensive income (loss)	0	0	(25)
Change in pension liability, net
Before Tax Amount
Other comprehensive income (loss)			43
Tax Benefit (Expense)
Other comprehensive income (loss)			(13)
Net of Tax Amount
Other comprehensive (loss) income before reclassifications			30
Reclassification adjustment for securities gains included in net income			0
Other comprehensive income (loss)	$ 0	$ 0	$ 30