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Comprehensive Income/(Loss) - Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income/(Loss) (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net securities (gains) losses reclassified into earnings $ (1,113) $ (4,268) $ (4,320)
Employee benefits (Non-interest expense) 41,033 41,723 39,313
Interest and dividends on securities (Interest and dividend income) (66,562) (70,593) (85,654)
Provision for income taxes 59,589 23,035 34,341
Net effect on accumulated other comprehensive income/(loss) for the period 1,869 325 1,970
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 (43) (1,936) (175)
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 1,912 2,286 2,313
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) (168)
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 (56) (2,540) 227
Provision for income taxes 13 604 (52)
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) 2,521 3,000 3,042
Provision for income taxes $ (609) (714) (729)
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) (222)
Provision for income taxes   $ 7 $ 54