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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period $ 5,232,114 $ 2,979,447 $ 3,012,018 $ 2,972,656
Other comprehensive income (loss) before    reclassifications (233,620) (27,845) (568,906) (82,079)
Amounts reclassified from AOCI to income 2,686 (1,802) 2,148 (3,430)
Balance at end of period 5,078,783 2,991,118 5,078,783 2,991,118
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (338,199) 91,909 (2,375) 147,771
Balance at end of period (569,133) 62,262 (569,133) 62,262
Unrealized Gains and Losses on Available- for-Sale Debt Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (314,364) 86,495 (2,950) 145,335
Other comprehensive income (loss) before    reclassifications (122,776) (26,886) (433,929) (84,173)
Amounts reclassified from AOCI to income 65 (514) (196) (2,067)
Balance at end of period (437,075) 59,095 (437,075) 59,095
Unrealized Gains and Losses on Held-to- Maturity Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (16,727) 0 0 0
Other comprehensive income (loss) before    reclassifications (108,266) 0 (125,229) 0
Amounts reclassified from AOCI to income 2,794 0 3,030 0
Balance at end of period (122,199) 0 (122,199) 0
Gains and Losses on Cash Flow Hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period (7,132) 5,525 543 2,584
Other comprehensive income (loss) before    reclassifications (2,578) (959) (9,748) 2,094
Amounts reclassified from AOCI to income (165) (1,325) (670) (1,437)
Balance at end of period (9,875) 3,241 (9,875) 3,241
Defined Benefit Pension Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at beginning of period 24 (111) 32 (148)
Other comprehensive income (loss) before    reclassifications 0 0 0 0
Amounts reclassified from AOCI to income (8) 37 (16) 74
Balance at end of period $ 16 $ (74) $ 16 $ (74)