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Comprehensive Income/(Loss) - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |
Net securities gains reclassified into earnings | $ (279) | $ (1,491)
Provision for income taxes | 18,202 | 3,621
Employee benefits (Non-interest expense) | 10,266 | 10,373
Interest and dividends on securities (Interest and dividend income) | (15,037) | (21,442)
Net effect on accumulated other comprehensive income/(loss) for the period | 470 | (1,176)
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 | (2) | (1,743)
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 | 472 | 569
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 |  | (2)
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 reclassified into earnings | (3) | (2,287)
Provision for income taxes | 1 | 544
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 | (150) | (177)
Employee benefits (Non-interest expense) | $ 622 | 746
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] |  |
Provision for income taxes |  | 1
Interest and dividends on securities (Interest and dividend income) |  | $ (3)

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