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Comprehensive Income/(Loss) - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income/(Loss) (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net securities losses (gains) reclassified into earnings | $ 1,777 | $ (1,113) | $ (4,268)
Employee benefits (Non-interest expense) | 37,771 | 41,033 | 41,723
Interest and dividends on securities (Interest and dividend income) | (84,941) | (66,562) | (70,593)
Provision for income taxes | 44,288 | 59,589 | 23,035
Net effect on accumulated other comprehensive income/(loss) for the period | 231 | 1,869 | 325
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 | 10 | (43) | (1,936)
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 | 221 | 1,912 | 2,286
Accumulated Unrealized Gains on Debt Securities Transferred from Available For Sale to Held to Maturity [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Net effect on accumulated other comprehensive income/(loss) for the period |  |  | (25)
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 losses (gains) reclassified into earnings | 13 | (56) | (2,540)
Provision for income taxes | (3) | 13 | 604
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] |  |  |
Employee benefits (Non-interest expense) | 291 | 2,521 | 3,000
Provision for income taxes | $ (70) | $ (609) | (714)
Amounts Reclassified From Accumulated Other Comprehensive Income/(Loss) [Member] | Accumulated Unrealized Gains on Debt Securities Transferred from Available For Sale to Held to Maturity [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Interest and dividends on securities (Interest and dividend income) |  |  | (32)
Provision for income taxes |  |  | $ 7

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