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, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	$ (11,915)	$ (68,611)	$ 12,529	$ (146,950)
Unrealized holding gains (losses) on available for sale securities before reclassifications
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	(16,916)	(97,408)	17,624	(208,710)
Reclassifications, before tax	0	0	164	0
OCI, after reclassifications, before tax	(16,916)	(97,408)	17,788	(208,710)
Tax effect	5,001	28,797	(5,259)	61,702
Other comprehensive income (loss)	(11,915)	(68,611)	12,529	(147,008)
Unfunded status of the supplemental retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	114	29	228	92
Reclassifications, before tax	(114)	(5)	(228)	(10)
OCI, after reclassifications, before tax	0	24	0	82
Tax effect	0	(24)	0	(24)
Other comprehensive income (loss)	0	0	0	58
Amortization of prior service cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications, before tax	0	(7)	0	(14)
Amortization of actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications, before tax	(114)	2	(228)	4
Joint beneficiary agreement liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, net of tax	$ 0	$ 0	$ 0	$ 0

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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