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Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ 2,712,680	$ 2,616,828
OCI before reclassifications	(153,860)	(39,999)
Amounts reclassified from AOCI	(32,842)	(1,041)
Ending Balance	2,569,535	2,629,655
Unrealized Gains (Losses) on Investment Securities
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	40,441	81,604
OCI before reclassifications	(153,860)	(39,999)
Amounts reclassified from AOCI	15	377
Ending Balance	(112,968)	43,769
Net Unrealized (Loss) Gain on Interest Rate Swaps used in Cash Flow Hedges
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(4,817)	0
OCI before reclassifications	0	0
Amounts reclassified from AOCI	(32,882)	(1,707)
Ending Balance	(37,699)	(1,707)
Unrecognized Pension and Postretirement Plan Income (Costs)
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(8,213)	(16,513)
OCI before reclassifications	0	0
Amounts reclassified from AOCI	25	289
Ending Balance	(8,188)	(16,224)
Total
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	27,411	65,091
Ending Balance	(158,855)	25,838
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from AOCI	436	1,787
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Investment Securities
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from AOCI	436	1,787
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized (Loss) Gain on Interest Rate Swaps used in Cash Flow Hedges
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from AOCI	0	0
Reclassification out of Accumulated Other Comprehensive Income | Unrecognized Pension and Postretirement Plan Income (Costs)
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from AOCI	$ 0	$ 0

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Amount after tax, before reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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