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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | $ 2,757,679 | $ 2,618,998 | $ 2,760,139 | $ 2,579,757
OCI before reclassifications | (11,943) | (36,805) | (24,311) | (10,984)
Amounts reclassified from AOCI | 19,474 | 7,010 | 23,267 | 14,195
Ending Balance | 3,101,609 | 2,642,152 | 3,101,609 | 2,642,152
Unrealized Gains (Losses) on Investment Securities |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | (290,140) | (282,095) | (274,862) | (316,231)
OCI before reclassifications | (14,199) | (31,219) | (30,864) | 1,422
Amounts reclassified from AOCI | 15,688 | (3) | 15,688 | 14
Ending Balance | (287,248) | (311,816) | (287,248) | (311,816)
Net Unrealized Gain (Loss) on Interest Rate Derivatives used in Cash Flow Hedges |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | (26,587) | (61,453) | (34,783) | (61,776)
OCI before reclassifications | 2,256 | (5,586) | 6,553 | (12,406)
Amounts reclassified from AOCI | 3,891 | 7,010 | 7,790 | 14,153
Ending Balance | (20,440) | (60,029) | (20,440) | (60,029)
Unrecognized Pension and Postretirement Plan Income (Costs) |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | (2,741) | (7,444) | (2,635) | (7,469)
OCI before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from AOCI | (105) | 3 | (211) | 28
Ending Balance | (2,846) | (7,441) | (2,846) | (7,441)
Total |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | (319,468) | (350,992) | (312,280) | (385,476)
Ending Balance | (310,534) | (379,286) | (310,534) | (379,286)
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Amounts reclassified from AOCI | 1,403 | 1,501 | 2,790 | 2,979
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Investment Securities |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Amounts reclassified from AOCI | 1,403 | 1,501 | 2,790 | 2,979
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 | 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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