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Accumulated Other Comprehensive (Loss) Income - Schedule Of The Changes In Components Of Accumulated Other Comprehensive Income (Loss) Balances (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 | $ 7,215,114 | $ 6,461,697 | $ 6,950,834 | $ 5,984,612
Other comprehensive income (loss) | 216,869 | (93,445) | 183,292 | (109,748)
Ending balance | 7,664,539 | 6,596,706 | 7,664,539 | 6,596,706
Debt Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (591,286) | (681,536) | (601,881) | (694,815)
Net unrealized gains (losses) arising during the period | 132,130 | (72,691) | 138,621 | (72,034)
Amounts reclassified from AOCI | 2,663 | 2,870 | 6,767 | 15,492
Other comprehensive income (loss) | 134,793 | (69,821) | 145,388 | (56,542)
Ending balance | (456,493) | (751,357) | (456,493) | (751,357)
Cash Flow Hedges |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (44,059) | (74,805) | 2,624 | (49,531)
Net unrealized gains (losses) arising during the period | 66,105 | (44,347) | (15,235) | (91,468)
Amounts reclassified from AOCI | 17,097 | 17,013 | 51,754 | 38,860
Other comprehensive income (loss) | 83,202 | (27,334) | 36,519 | (52,608)
Ending balance | 39,143 | (102,139) | 39,143 | (102,139)
Foreign Currency Translation Adjustments |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (18,828) | (25,591) | (21,339) | (21,283)
Net unrealized gains (losses) arising during the period | (1,126) | 3,710 | 1,385 | (598)
Amounts reclassified from AOCI | 0 | 0 | 0 | 0
Other comprehensive income (loss) | (1,126) | 3,710 | 1,385 | (598)
Ending balance | (19,954) | (21,881) | (19,954) | (21,881)
AOCI, Net of Tax |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (654,173) | (781,932) | (620,596) | (765,629)
Net unrealized gains (losses) arising during the period | 197,109 | (113,328) | 124,771 | (164,100)
Amounts reclassified from AOCI | 19,760 | 19,883 | 58,521 | 54,352
Other comprehensive income (loss) | 216,869 | (93,445) | 183,292 | (109,748)
Ending balance | $ (437,304) | $ (875,377) | $ (437,304) | $ (875,377)

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