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Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	$ (76,740)	$ (4,440)	$ (223,690)	$ (8,553)
Net unrealized loss on available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	(109,341)	(6,304)	(317,659)	(11,249)
OCI, after reclassifications, before tax	(109,341)	(6,304)	(317,659)	(11,249)
Tax effect	32,601	1,864	93,911	3,325
Reclassifications, before tax	0	0	0	0
Other comprehensive income (loss)	(76,740)	(4,440)	(223,748)	(7,924)
Unfunded status of the supplemental retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	5	(49)	97	(147)
OCI, after reclassifications, before tax	0	0	82	0
Tax effect		0	(24)	0
Reclassifications, before tax	(5)	49	(15)	147
Other comprehensive income (loss)	0	0	58	0
Amortization of prior service cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications, before tax	(7)	(14)	(21)	(43)
Amortization of actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications, before tax	2	63	6	190
Joint beneficiary agreement liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	0	0	0	(629)
Tax effect	0	0	0	0
OCI, before reclassifications, net of tax	$ 0	$ 0	$ 0	$ (629)

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