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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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