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Accumulated Other Comprehensive Income Components of Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ 2,616,828	$ 2,342,176
Ending Balance	2,629,655	2,285,748
Unrealized Gains (Losses) on Investment Securities
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	81,604	14,864
OCI before reclassifications	(39,999)	17,431
Amounts reclassified from AOCI	377	(36)
Ending Balance	43,769	33,054
Net Unrealized (Loss) on Interest Rate Swaps used in Cash Flow Hedges
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	0	0
OCI before reclassifications	0	0
Amounts reclassified from AOCI	(1,707)	0
Ending Balance	(1,707)	0
Unrecognized Pension and Postretirement Plan Income (Costs)
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(16,513)	(15,001)
OCI before reclassifications	0	0
Amounts reclassified from AOCI	289	255
Ending Balance	(16,224)	(14,746)
Total
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	65,091	(137)
OCI before reclassifications	(39,999)	17,431
Amounts reclassified from AOCI	(1,042)	219
Ending Balance	25,838	18,308
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from AOCI	1,787	795
Reclassification out of Accumulated Other Comprehensive Income \| Unrealized Gains (Losses) on Investment Securities
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from AOCI	1,787	795
Reclassification out of Accumulated Other Comprehensive Income \| Net Unrealized (Loss) 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

Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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