Comprehensive Loss - Components of Other Comprehensive loss and Related Tax Effects (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive loss	$ (44,040)	$ (76,740)	$ (31,511)	$ (223,690)
Unrealized holding losses on available for sale securities before reclassifications
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	(62,525)	(109,341)	(44,901)	(317,659)
Reclassifications, before tax	0	0	164	0
OCI, after reclassifications, before tax	(62,525)	(109,341)	(44,737)	(317,659)
Tax effect	18,485	32,601	13,226	93,911
Other comprehensive loss	(44,040)	(76,740)	(31,511)	(223,748)
Unfunded status of the supplemental retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	114	5	342	97
Reclassifications, before tax	(114)	(5)	(342)	(15)
OCI, after reclassifications, before tax	0	0	0	82
Tax effect	0	0	0	(24)
Other comprehensive loss	0	0	0	58
Amortization of prior service cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications, before tax	0	(7)	0	(21)
Amortization of actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications, before tax	(114)	2	(342)	6
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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