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Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	$ 68,611	$ (5,206)	$ 146,950	$ 4,113
Net unrealized loss on available for sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	(97,408)	7,392	(208,710)	(4,945)
OCI, after reclassifications, before tax	(97,408)	7,392	(208,710)	(4,945)
Tax effect	28,797	(2,186)	61,702	1,461
Reclassifications, before tax	0	0	0	0
Other comprehensive income (loss)	(68,611)	5,206	(147,008)	(3,484)
Unfunded status of the supplemental retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	5	(49)	92	(98)
OCI, after reclassifications, before tax	0	0	(82)	0
Tax effect		0	(24)	0
Reclassifications, before tax	(5)	49	(10)	98
Other comprehensive income (loss)	0	0	(58)	0
Amortization of prior service cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications, before tax	(7)	(15)	(14)	(29)
Amortization of actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications, before tax	2	64	4	127
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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