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Accumulated Other Comprehensive (Loss) Income - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ 3,197,325	$ 2,760,139
OCI before reclassifications	11,533	(12,368)
Amounts reclassified from AOCI	3,411	3,793
Ending Balance	3,274,321	2,757,679
Unrealized Gains (Losses) on Investment Securities
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(275,989)	(274,862)
OCI before reclassifications	9,769	(16,665)
Amounts reclassified from AOCI	2	0
Ending Balance	(264,890)	(290,140)
Net Unrealized Gain (Loss) on Interest Rate Derivatives used in Cash Flow Hedges
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(16,052)	(34,783)
OCI before reclassifications	1,764	4,297
Amounts reclassified from AOCI	3,515	3,899
Ending Balance	(10,773)	(26,587)
Unrecognized Pension and Postretirement Plan Income (Costs)
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	4,222	(2,635)
OCI before reclassifications	0	0
Amounts reclassified from AOCI	(106)	(106)
Ending Balance	4,116	(2,741)
Total
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(287,819)	(312,280)
Ending Balance	(271,547)	(319,468)
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from AOCI	1,328	1,387
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Investment Securities
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from AOCI	1,328	1,387
Reclassification out of Accumulated Other Comprehensive Income | Net Unrealized Gain (Loss) on Interest Rate Derivatives 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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