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Comprehensive Income/(Loss) - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income/(Loss) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities (gains) losses reclassified into earnings	$ (1,210)	$ (675)	$ (2,302)	$ (1,347)
Provision for income taxes	19,737	7,501	32,623	21,296
Employee benefits (Non-interest expense)	18,040	11,522	49,867	34,284
Net effect on accumulated other comprehensive income/(loss) for the period	(389)	(135)	(967)	(373)
Accumulated Unrealized Gains (Losses) on Debt Securities Available for Sale [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net effect on accumulated other comprehensive income/(loss) for the period	(248)	(58)	(551)	(166)
Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net effect on accumulated other comprehensive income/(loss) for the period	(141)	(77)	(416)	(207)
Amounts Reclassified From Accumulated Other Comprehensive Income/(Loss) [Member] | Accumulated Unrealized Gains (Losses) on Debt Securities Available for Sale [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net securities (gains) losses reclassified into earnings	(55)	0	(104)	12
Provision for income taxes	(193)	(58)	(447)	(178)
Amounts Reclassified From Accumulated Other Comprehensive Income/(Loss) [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Provision for income taxes	45	24	136	97
Employee benefits (Non-interest expense)	$ (186)	$ (101)	$ (552)	$ (304)

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Amount of unrealized and realized gain (loss) on investment in debt and equity securities.

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