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Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]
Total amounts reclassified out of accumulated other comprehensive income (loss)	$ (1,146)	$ 0
Other comprehensive income (loss)	22,098	(11,198)
Unrealized holding gains (losses) on available for sale securities before reclassifications
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	32,518	(15,899)
Reclassifications, before tax	(1,146)	0
OCI, after reclassifications, before tax	31,372	(15,899)
Tax effect	(9,274)	4,701
Other comprehensive income (loss)	22,098	(11,198)
Unfunded status of the supplemental retirement plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
OCI, before reclassifications, before tax	164	459
Reclassifications, before tax	(164)	(459)
Amortization of actuarial losses
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassifications, before tax	$ (164)	$ (459)

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