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Shareholders' Equity - Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Beginning Balance | $ (385,476) |  |
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM | 5,913 | $ (44,483) | $ 2,690
Ending Balance | (312,280) | (385,476) |
Unrealized Gains (Losses) on Investment Securities |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Beginning Balance | (316,231) | 40,441 | 81,604
OCI before reclassifications | 36,023 | (312,169) | (17,948)
Amounts reclassified from AOCI gain (loss) | (567) | (20) | (25,905)
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM | 5,913 | (44,483) | 2,690
Ending Balance | (274,862) | (316,231) | 40,441
Net Unrealized Gain (Loss) on Interest Rate Derivatives used in Cash Flow Hedges |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Beginning Balance | (61,776) | (4,817) | 0
OCI before reclassifications | 6,998 | (62,963) | 0
Amounts reclassified from AOCI gain (loss) | 19,995 | 6,004 | (4,817)
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM | 0 | 0 | 0
Ending Balance | (34,783) | (61,776) | (4,817)
Unrecognized Pension and Postretirement Plan Income (Costs) |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Beginning Balance | (7,469) | (8,213) | (16,513)
OCI before reclassifications | 4,777 | 644 | 7,144
Amounts reclassified from AOCI gain (loss) | 57 | 100 | 1,156
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM | 0 | 0 | 0
Ending Balance | (2,635) | (7,469) | (8,213)
Accumulated Other Comprehensive (Loss) Income |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items] |  |  |
Beginning Balance | (385,476) | 27,411 | 65,091
OCI before reclassifications | 47,798 | (374,488) | (10,804)
Amounts reclassified from AOCI gain (loss) | 19,485 | 6,084 | (29,566)
Amortization of net unrealized gains (losses) on AFS securities transferred to HTM | 5,913 | (44,483) | 2,690
Ending Balance | $ (312,280) | $ (385,476) | $ 27,411

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