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, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]
Other comprehensive income (loss)	$ 44,538	$ (44,040)	$ 36,192	$ (31,511)
Unrealized holding gains (losses) on available for sale securities before reclassifications
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	63,232	(62,525)	48,438	(44,901)
Reclassifications, before tax	(2)	0	2,945	164
OCI, after reclassifications, before tax	63,230	(62,525)	51,383	(44,737)
Tax effect	(18,692)	18,485	(15,191)	13,226
Other comprehensive income (loss)	44,538	(44,040)	36,192	(31,511)
Unfunded status of the supplemental retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	114	114	344	342
Reclassifications, before tax	(114)	(114)	(344)	(342)
OCI, after reclassifications, before tax	0	0	0	0
Tax effect	0	0	0	0
Other comprehensive income (loss)	0	0	0	0
Amortization of prior service cost
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications, before tax	0	0	0	0
Amortization of actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications, before tax	(114)	(114)	(344)	(342)
Joint beneficiary agreement liability
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	0	0	0	0
Tax effect	0	0	0	0
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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