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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | $ 5,277,426 | $ 5,232,114 | $ 5,128,595 | $ 3,012,018
Other comprehensive income (loss) before reclassifications | (80,281) | (233,620) | (15,752) | (568,906)
Amounts reclassified from AOCI to income | (19,994) | 2,686 | (6,459) | 2,148
Balance at end of period | 5,292,095 | 5,078,783 | 5,292,095 | 5,078,783
Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (708,358) | (338,199) | (786,422) | (2,375)
Balance at end of period | (808,633) | (569,133) | (808,633) | (569,133)
Unrealized Gains and Losses on Available- for-Sale Debt Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (611,260) | (314,364) | (642,346) | (2,950)
Other comprehensive income (loss) before reclassifications | (90,121) | (122,776) | (62,902) | (433,929)
Amounts reclassified from AOCI to income | (12) | 65 | 3,855 | (196)
Balance at end of period | (701,393) | (437,075) | (701,393) | (437,075)
Unrealized Gains and Losses on Held-to- Maturity Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (106,966) | (16,727) | (112,664) | 0
Other comprehensive income (loss) before reclassifications | 0 | (108,266) | 1,325 | (125,229)
Amounts reclassified from AOCI to income | 3,822 | 2,794 | 8,195 | 3,030
Balance at end of period | (103,144) | (122,199) | (103,144) | (122,199)
Gains and Losses on Hedges |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | 9,872 | (7,132) | (31,549) | 543
Other comprehensive income (loss) before reclassifications | 9,840 | (2,578) | 45,825 | (9,748)
Amounts reclassified from AOCI to income | (23,808) | (165) | (18,372) | (670)
Balance at end of period | (4,096) | (9,875) | (4,096) | (9,875)
Defined Benefit Pension Plans |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (4) | 24 | 137 | 32
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from AOCI to income | 4 | (8) | (137) | (16)
Balance at end of period | $ 0 | $ 16 | $ 0 | $ 16

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