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Accumulated Other Comprehensive Income (Loss) - Components of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | $ 6,950,834 | $ 5,984,612
Other comprehensive (loss) income | (42,137) | 85,635
Ending balance | 7,023,232 | 6,309,331
Debt Securities |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (601,881) | (694,815)
Net unrealized (losses) gains arising during the period | (2,282) | 44,275
Amounts reclassified from AOCI | 2,653 | 9,806
Other comprehensive (loss) income | 371 | 54,081
Ending balance | (601,510) | (640,734)
Cash Flow Hedges |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | 2,624 | (49,531)
Net unrealized (losses) gains arising during the period | (63,662) | 21,086
Amounts reclassified from AOCI | 17,332 | 7,527
Other comprehensive (loss) income | (46,330) | 28,613
Ending balance | (43,706) | (20,918)
Foreign Currency Translation Adjustments |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (21,339) | (21,283)
Net unrealized (losses) gains arising during the period | 3,822 | 2,941
Amounts reclassified from AOCI | 0 | 0
Other comprehensive (loss) income | 3,822 | 2,941
Ending balance | (17,517) | (18,342)
AOCI, Net of Tax |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |
Beginning balance | (620,596) | (765,629)
Net unrealized (losses) gains arising during the period | (62,122) | 68,302
Amounts reclassified from AOCI | 19,985 | 17,333
Other comprehensive (loss) income | (42,137) | 85,635
Ending balance | $ (662,733) | $ (679,994)

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