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Accumulated Other Comprehensive (Loss) Income - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | $ 3,101,609 | $ 2,642,152 | $ 2,760,139 | $ 2,579,757
OCI before reclassifications | 61,936 | (101,399) | 37,625 | (112,383)
Amounts reclassified from AOCI | 3,874 | 6,435 | 27,141 | 20,630
Ending Balance | 3,203,943 | 2,566,693 | 3,203,943 | 2,566,693
Unrealized Gains (Losses) on Investment Securities |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | (287,248) | (311,816) | (274,862) | (316,231)
OCI before reclassifications | 68,560 | (105,050) | 37,696 | (103,628)
Amounts reclassified from AOCI | 1 | 0 | 15,689 | 14
Ending Balance | (217,265) | (415,372) | (217,265) | (415,372)
Net Unrealized Gain (Loss) on Interest Rate Derivatives used in Cash Flow Hedges |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | (20,440) | (60,029) | (34,783) | (61,776)
OCI before reclassifications | (6,624) | 3,651 | (71) | (8,755)
Amounts reclassified from AOCI | 3,979 | 6,420 | 11,769 | 20,573
Ending Balance | (23,085) | (49,958) | (23,085) | (49,958)
Unrecognized Pension and Postretirement Plan Income (Costs) |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | (2,846) | (7,441) | (2,635) | (7,469)
OCI before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from AOCI | (106) | 15 | (317) | 43
Ending Balance | (2,952) | (7,426) | (2,952) | (7,426)
Total |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | (310,534) | (379,286) | (312,280) | (385,476)
Ending Balance | (243,302) | (472,756) | (243,302) | (472,756)
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Amounts reclassified from AOCI | 1,422 | 1,494 | 4,212 | 4,473
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Investment Securities |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Amounts reclassified from AOCI | 1,422 | 1,494 | 4,212 | 4,473
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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