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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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