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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