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Comprehensive Income/(Loss) - Components of Accumulated Other Comprehensive Income (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance $ 2,756,737 $ 2,593,921 $ 1,978,827
Amounts reclassified from accumulated other comprehensive income/(loss) 1,869 325 1,970
Total other comprehensive (loss) gain (36,479) 30,158 39,072
Ending Balance 2,693,166 2,756,737 2,593,921
Cumulative Effect, Period of Adoption, Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance   (26,591)  
Ending Balance     (26,591)
Accumulated Defined Benefit Plans Adjustment [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance (15,502) (17,468) (16,542)
Other comprehensive income/(loss) before reclassifications 13,192 (320) (3,239)
Amounts reclassified from accumulated other comprehensive income/(loss) 1,912 2,286 2,313
Total other comprehensive (loss) gain 15,104 1,966 (926)
Ending Balance (398) (15,502) (17,468)
Accumulated Unrealized Gains (Losses) on Debt Securities Available for Sale [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 46,861 18,644 (21,522)
Other comprehensive income/(loss) before reclassifications (51,540) 30,153 40,341
Amounts reclassified from accumulated other comprehensive income/(loss) (43) (1,936) (175)
Total other comprehensive (loss) gain (51,583) 28,217 40,166
Ending Balance (4,722) 46,861 18,644
Accumulated Unrealized Gains on Debt Securities Transferred from Available For Sale to Held to Maturity [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance   25 193
Amounts reclassified from accumulated other comprehensive income/(loss)   (25) (168)
Total other comprehensive (loss) gain   (25) (168)
Ending Balance     25
Accumulated Other Comprehensive Income (Loss) [Member]      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Beginning Balance 31,359 1,201 (37,871)
Other comprehensive income/(loss) before reclassifications (38,348) 29,833 37,102
Amounts reclassified from accumulated other comprehensive income/(loss) 1,869 325 1,970
Total other comprehensive (loss) gain (36,479) 30,158 39,072
Ending Balance $ (5,120) $ 31,359 $ 1,201