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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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