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Accumulated Other Comprehensive (Loss) Income - Changes in 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
Equity [Abstract] |  |  |  |
Unrealized loss on securities, before tax amount | $ 88,637 | $ (135,811) | $ 48,735 | $ (133,973)
Unrealized loss on securities, tax effect | (20,077) | 30,761 | (11,039) | 30,345
Unrealized loss on securities, net of tax amount | 68,560 | (105,050) | 37,696 | (103,628)
Reclassification adjustment for securities gain included in net income, before tax amount | 1 | 0 | 20,283 | 19
Reclassification adjustment for securities gain included in net income, tax effect | 0 | 0 | (4,594) | (5)
Reclassification adjustment for securities gain included in net income, net of tax amount | 1 | 0 | 15,689 | 14
Amortization of net unrealized losses on AFS securities transferred to HTM. before-tax amount | 1,837 | 1,932 | 5,445 | 5,783
Amortization of net unrealized losses on AFS securities transferred to HTM, tax | (415) | (438) | (1,233) | (1,310)
Amortization of net unrealized losses on AFS securities transferred to HTM, net of tax amount | 1,422 | 1,494 | 4,212 | 4,473
Net unrealized loss on interest rate swaps used in cash flow hedges, before-tax amount | (8,564) | 4,691 | (92) | 9,975
Net unrealized loss on interest rate swaps used in cash flow hedges, before-tax amount | 1,940 | (1,040) | 21 | (18,730)
Amount of Gain (Loss) Recognized in OCI on Derivative | (6,624) | 3,651 | (71) | (8,755)
Net unrealized losses on interest rate swaps used in cash flow hedges, before-tax amount | 5,144 | 6,248 | 15,158 | 20,437
Net unrealized losses on interest rate swaps used in cash flow hedges, tax | (1,165) | 172 | (3,389) | 136
Net unrealized losses on interest rate swaps used in cash flow hedges, net of tax amount | 3,979 | 6,420 | 11,769 | 20,573
Amortization of net unrecognized pension and postretirement items, before tax amount | (135) | 18 | (406) | 55
Amortization of net unrecognized pension and postretirement items, tax effect | 29 | (3) | 89 | (12)
Amortization of net unrecognized pension and postretirement items, net of tax amount | (106) | 15 | (317) | 43
Total Other Comprehensive Income, Before Tax Amount | 86,920 | (122,922) | 89,123 | (97,704)
Total Other Comprehensive Income, Tax Effect | (19,688) | 29,452 | (20,145) | 10,424
Other Comprehensive Income (Loss), net of tax | $ 67,232 | $ (93,470) | $ 68,978 | $ (87,280)

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