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Accumulated Other Comprehensive (Loss) Income - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ 2,569,535	$ 2,629,655	$ 2,712,680	$ 2,616,828
OCI before reclassifications	(88,352)	19,298	(242,211)	(20,701)
Amounts reclassified from AOCI	(8,890)	2,335	(41,733)	1,294
Ending Balance	2,471,093	2,692,958	2,471,093	2,692,958
Unrealized Gains (Losses) on Investment Securities
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(112,968)	43,769	40,440	81,604
OCI before reclassifications	(88,352)	19,298	(242,211)	(20,701)
Amounts reclassified from AOCI	6	(28)	21	349
Ending Balance	(249,427)	62,769	(249,427)	62,769
Net Unrealized (Loss) Gain on Interest Rate Swaps used in Cash Flow Hedges
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(37,699)	(1,707)	(4,816)	0
OCI before reclassifications	0	0	0	0
Amounts reclassified from AOCI	(8,921)	2,074	(41,804)	367
Ending Balance	(46,620)	367	(46,620)	367
Unrecognized Pension and Postretirement Plan Income (Costs)
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(8,188)	(16,224)	(8,213)	(16,513)
OCI before reclassifications	0	0	0	0
Amounts reclassified from AOCI	25	289	50	578
Ending Balance	(8,163)	(15,935)	(8,163)	(15,935)
Total
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(158,855)	25,838	27,411	65,091
Ending Balance	(304,210)	47,201	(304,210)	47,201
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from AOCI	(48,113)	(270)	(47,677)	1,517
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Investment Securities
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from AOCI	(48,113)	(270)	(47,677)	1,517
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	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	$ 0	$ 0

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- Definition

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

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