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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | $ 5,292,095 | $ 5,078,783 | $ 5,128,595 | $ 3,012,018
Other comprehensive income (loss) before reclassifications | (168,206) | (245,126) | (183,958) | (814,032)
Amounts reclassified from AOCI to income | 8,024 | 5,809 | 1,565 | 7,957
Balance at end of period | 5,239,537 | 4,943,383 | 5,239,537 | 4,943,383
Accumulated Other Comprehensive Income (Loss) |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (808,633) | (569,133) | (786,422) | (2,375)
Balance at end of period | (968,815) | (808,450) | (968,815) | (808,450)
Unrealized Gains and Losses on Available- for-Sale Debt Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (701,393) | (437,075) | (642,346) | (2,950)
Other comprehensive income (loss) before reclassifications | (156,660) | (217,401) | (219,562) | (651,330)
Amounts reclassified from AOCI to income | 178 | 131 | 4,033 | (65)
Balance at end of period | (857,875) | (654,345) | (857,875) | (654,345)
Unrealized Gains and Losses on Held-to- Maturity Securities |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (103,144) | (122,199) | (112,664) | 0
Other comprehensive income (loss) before reclassifications | 0 | 0 | 1,325 | (125,229)
Amounts reclassified from AOCI to income | 4,193 | 5,121 | 12,388 | 8,151
Balance at end of period | (98,951) | (117,078) | (98,951) | (117,078)
Gains and Losses on Hedges |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | (4,096) | (9,875) | (31,549) | 543
Other comprehensive income (loss) before reclassifications | (11,546) | (27,725) | 34,279 | (37,473)
Amounts reclassified from AOCI to income | 3,653 | 565 | (14,719) | (105)
Balance at end of period | (11,989) | (37,035) | (11,989) | (37,035)
Defined Benefit Pension Plans |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |
Balance at beginning of period | 0 | 16 | 137 | 32
Other comprehensive income (loss) before reclassifications | 0 | 0 | 0 | 0
Amounts reclassified from AOCI to income | 0 | (8) | (137) | (24)
Balance at end of period | $ 0 | $ 8 | $ 0 | $ 8

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