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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 6,075,072 | $ 5,292,095 | $ 5,562,900 | $ 5,128,595
Other comprehensive income (loss) before reclassifications | 180,398 | (168,206) | 114,168 | (183,958)
Amounts reclassified from AOCI to income | 7,254 | 8,024 | 20,885 | 1,565
Ending balance | 6,367,298 | 5,239,537 | 6,367,298 | 5,239,537
Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (791,408) | (808,633) | (738,809) | (786,422)
Ending balance | (603,756) | (968,815) | (603,756) | (968,815)
Unrealized Gains and Losses on Available- for-Sale Debt Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (699,318) | (701,393) | (652,518) | (642,346)
Other comprehensive income (loss) before reclassifications | 162,861 | (156,660) | 116,051 | (219,562)
Amounts reclassified from AOCI to income | 57 | 178 | 67 | 4,033
Ending balance | (536,400) | (857,875) | (536,400) | (857,875)
Unrealized Gains and Losses on Held-to- Maturity Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (88,986) | (103,144) | (95,472) | (112,664)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 1,325
Amounts reclassified from AOCI to income | 3,537 | 4,193 | 10,023 | 12,388
Ending balance | (85,449) | (98,951) | (85,449) | (98,951)
Gains and Losses on Hedges |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (3,104) | (4,096) | 9,181 | (31,549)
Other comprehensive income (loss) before reclassifications | 17,537 | (11,546) | (1,883) | 34,279
Amounts reclassified from AOCI to income | 3,660 | 3,653 | 10,795 | (14,719)
Ending balance | 18,093 | (11,989) | 18,093 | (11,989)
Defined Benefit Pension Plans |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 0 | 0 | 0 | 137
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from AOCI to income | 0 | 0 | 0 | (137)
Ending balance | $ 0 | $ 0 | $ 0 | $ 0

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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