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v3.23.3

Accumulated Other Comprehensive (Loss) Income - Components of Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | $ 2,642,152 | $ 2,471,093 | $ 2,579,757 | $ 2,712,680
OCI before reclassifications | (101,399) | (142,857) | (112,383) | (425,030)
Amounts reclassified from AOCI | 6,435 | 2,467 | 20,630 | 696
Ending Balance | 2,566,693 | 2,471,159 | 2,566,693 | 2,471,159
Unrealized Gains (Losses) on Investment Securities |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | (311,816) | (249,427) | (316,231) | 40,440
OCI before reclassifications | (105,050) | (120,385) | (103,628) | (362,596)
Amounts reclassified from AOCI | 0 | (41) | 14 | (20)
Ending Balance | (415,372) | (368,200) | (415,372) | (368,200)
Net Unrealized Gain (Loss) on Interest Rate Derivatives used in Cash Flow Hedges |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | (60,029) | (46,620) | (61,776) | (4,816)
OCI before reclassifications | 3,651 | (22,472) | (8,755) | (62,434)
Amounts reclassified from AOCI | 6,420 | 2,483 | 20,573 | 641
Ending Balance | (49,958) | (66,609) | (49,958) | (66,609)
Unrecognized Pension and Postretirement Plan Income (Costs) |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | (7,441) | (8,163) | (7,469) | (8,213)
OCI before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from AOCI | 15 | 25 | 43 | 75
Ending Balance | (7,426) | (8,138) | (7,426) | (8,138)
Total |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Beginning Balance | (379,286) | (304,210) | (385,476) | 27,411
Ending Balance | (472,756) | (442,947) | (472,756) | (442,947)
Reclassification out of Accumulated Other Comprehensive Income |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Amounts reclassified from AOCI | 1,494 | 1,653 | 4,473 | (46,024)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) on Investment Securities |  |  |  |
Accumulated Other Comprehensive Income [Roll Forward] |  |  |  |
Amounts reclassified from AOCI | 1,494 | 1,653 | 4,473 | (46,024)
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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