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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, 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