Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	$ (11,198)	$ 24,444
Unrealized holding gains (losses) on available for sale securities before reclassifications
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	(15,899)	34,540
Reclassifications, before tax	0	164
OCI, after reclassifications, before tax	(15,899)	34,704
Tax effect	4,701	(10,260)
Other comprehensive income (loss)	(11,198)	24,444
Unfunded status of the supplemental retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	459	114
Reclassifications, before tax	(459)	(114)
OCI, after reclassifications, before tax	0	0
Tax effect	0	0
Other comprehensive income (loss)	0	0
Amortization of prior service cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications, before tax	0	0
Amortization of actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications, before tax	(459)	(114)
Joint beneficiary agreement liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	0	0
Tax effect	0	0
OCI, before reclassifications, net of tax	$ 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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