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Accumulated Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	$ 2,629,655	$ 2,285,748	$ 2,616,828	$ 2,342,176
OCI before reclassifications	19,298	34,424	(20,701)	51,853
Amounts reclassified from AOCI	2,335	(2,086)	1,294	(1,866)
Ending Balance	2,692,958	2,340,501	2,692,958	2,340,501
Unrealized Gains (Losses) on Investment Securities
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	43,769	33,054	81,604	14,864
OCI before reclassifications	19,298	34,424	(20,701)	51,853
Amounts reclassified from AOCI	(28)	(2,341)	349	(2,376)
Ending Balance	62,769	65,930	62,769	65,930
Net Unrealized (Loss) Gain on Interest Rate Swaps used in Cash Flow Hedges
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(1,707)	0	0	0
OCI before reclassifications	0	0	0	0
Amounts reclassified from AOCI	2,074	0	367	0
Ending Balance	367	0	367	0
Unrecognized Pension and Postretirement Plan Income (Costs)
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	(16,224)	(14,746)	(16,513)	(15,001)
OCI before reclassifications	0	0	0	0
Amounts reclassified from AOCI	289	255	578	510
Ending Balance	(15,935)	(14,491)	(15,935)	(14,491)
Total
Accumulated Other Comprehensive Income [Roll Forward]
Beginning Balance	25,838	18,308	65,091	(137)
Ending Balance	47,201	51,439	47,201	51,439
Reclassification out of Accumulated Other Comprehensive Income
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from AOCI	(270)	793	1,517	1,589
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Investment Securities
Accumulated Other Comprehensive Income [Roll Forward]
Amounts reclassified from AOCI	(270)	793	1,517	1,589
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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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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