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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | $ 5,595,408 | $ 5,277,426 | $ 5,562,900 | $ 5,128,595
Other comprehensive income (loss) before reclassifications | (18,562) | (80,281) | (66,230) | (15,752)
Amounts reclassified from AOCI to income | 6,782 | (19,994) | 13,631 | (6,459)
Ending balance | 6,075,072 | 5,292,095 | 6,075,072 | 5,292,095
Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (779,628) | (708,358) | (738,809) | (786,422)
Ending balance | (791,408) | (808,633) | (791,408) | (808,633)
Unrealized Gains and Losses on Available- for-Sale Debt Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (685,969) | (611,260) | (652,518) | (642,346)
Other comprehensive income (loss) before reclassifications | (13,347) | (90,121) | (46,810) | (62,902)
Amounts reclassified from AOCI to income | (2) | (12) | 10 | 3,855
Ending balance | (699,318) | (701,393) | (699,318) | (701,393)
Unrealized Gains and Losses on Held-to- Maturity Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (92,251) | (106,966) | (95,472) | (112,664)
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 1,325
Amounts reclassified from AOCI to income | 3,265 | 3,822 | 6,486 | 8,195
Ending balance | (88,986) | (103,144) | (88,986) | (103,144)
Gains and Losses on Hedges |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (1,408) | 9,872 | 9,181 | (31,549)
Other comprehensive income (loss) before reclassifications | (5,215) | 9,840 | (19,420) | 45,825
Amounts reclassified from AOCI to income | 3,519 | (23,808) | 7,135 | (18,372)
Ending balance | (3,104) | (4,096) | (3,104) | (4,096)
Defined Benefit Pension Plans |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Beginning balance | 0 | (4) | 0 | 137
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from AOCI to income | 0 | 4 | 0 | (137)
Ending balance | $ 0 | $ 0 | $ 0 | $ 0

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