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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period $ 5,078,783 $ 2,991,118 $ 3,012,018 $ 2,972,656
Other comprehensive income (loss) before    reclassifications (245,126) (3,354) (814,032) (85,433)
Amounts reclassified from AOCI to income 5,809 (2,098) 7,957 (5,528)
Balance at end of period 4,943,383 3,035,892 4,943,383 3,035,892
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (569,133) 62,262 (2,375) 147,771
Balance at end of period (808,450) 56,810 (808,450) 56,810
Unrealized Gains and Losses on Available- for-Sale Debt Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (437,075) 59,095 (2,950) 145,335
Other comprehensive income (loss) before    reclassifications (217,401) (3,230) (651,330) (87,403)
Amounts reclassified from AOCI to income 131 (945) (65) (3,012)
Balance at end of period (654,345) 54,920 (654,345) 54,920
Unrealized Gains and Losses on Held-to- Maturity Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (122,199) 0 0 0
Other comprehensive income (loss) before    reclassifications 0 0 (125,229) 0
Amounts reclassified from AOCI to income 5,121 0 8,151 0
Balance at end of period (117,078) 0 (117,078) 0
Gains and Losses on Cash Flow Hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (9,875) 3,241 543 2,584
Other comprehensive income (loss) before    reclassifications (27,725) (124) (37,473) 1,970
Amounts reclassified from AOCI to income 565 (1,190) (105) (2,627)
Balance at end of period (37,035) 1,927 (37,035) 1,927
Defined Benefit Pension Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period 16 (74) 32 (148)
Other comprehensive income (loss) before    reclassifications 0 0 0 0
Amounts reclassified from AOCI to income (8) 37 (24) 111
Balance at end of period $ 8 $ (37) $ 8 $ (37)