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Comprehensive Income/(Loss) - Components of Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | $ 2,693,166 | $ 2,756,737 | $ 2,593,921
Amounts reclassified from accumulated other comprehensive income/(loss) | 231 | 1,869 | 325
Total other comprehensive (loss) gain | (257,296) | (36,479) | 30,158
Ending Balance | 2,426,662 | 2,693,166 | 2,756,737
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance |  |  | (26,591)
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (398) | (15,502) | (17,468)
Other comprehensive income/(loss) before reclassifications | (358) | 13,192 | (320)
Amounts reclassified from accumulated other comprehensive income/(loss) | 221 | 1,912 | 2,286
Total other comprehensive (loss) gain | (137) | 15,104 | 1,966
Ending Balance | (535) | (398) | (15,502)
Accumulated Unrealized Gains (Losses) on Debt Securities Available for Sale [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (4,722) | 46,861 | 18,644
Other comprehensive income/(loss) before reclassifications | (257,169) | (51,540) | 30,153
Amounts reclassified from accumulated other comprehensive income/(loss) | 10 | (43) | (1,936)
Total other comprehensive (loss) gain | (257,159) | (51,583) | 28,217
Ending Balance | (261,881) | (4,722) | 46,861
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
Amounts reclassified from accumulated other comprehensive income/(loss) |  |  | (25)
Total other comprehensive (loss) gain |  |  | (25)
Accumulated Other Comprehensive Income (Loss) [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Beginning Balance | (5,120) | 31,359 | 1,201
Other comprehensive income/(loss) before reclassifications | (257,527) | (38,348) | 29,833
Amounts reclassified from accumulated other comprehensive income/(loss) | 231 | 1,869 | 325
Total other comprehensive (loss) gain | (257,296) | (36,479) | 30,158
Ending Balance | $ (262,416) | $ (5,120) | $ 31,359

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