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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 5,595,408 $ 5,277,426 $ 5,562,900 $ 5,128,595
Other comprehensive income (loss) before    reclassifications (18,562) (80,281) (66,230) (15,752)
Amounts reclassified from AOCI to income 6,782 (19,994) 13,631 (6,459)
Ending balance 6,075,072 5,292,095 6,075,072 5,292,095
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (779,628) (708,358) (738,809) (786,422)
Ending balance (791,408) (808,633) (791,408) (808,633)
Unrealized Gains and Losses on Available- for-Sale Debt Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (685,969) (611,260) (652,518) (642,346)
Other comprehensive income (loss) before    reclassifications (13,347) (90,121) (46,810) (62,902)
Amounts reclassified from AOCI to income (2) (12) 10 3,855
Ending balance (699,318) (701,393) (699,318) (701,393)
Unrealized Gains and Losses on Held-to- Maturity Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (92,251) (106,966) (95,472) (112,664)
Other comprehensive income (loss) before    reclassifications 0 0 0 1,325
Amounts reclassified from AOCI to income 3,265 3,822 6,486 8,195
Ending balance (88,986) (103,144) (88,986) (103,144)
Gains and Losses on Hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (1,408) 9,872 9,181 (31,549)
Other comprehensive income (loss) before    reclassifications (5,215) 9,840 (19,420) 45,825
Amounts reclassified from AOCI to income 3,519 (23,808) 7,135 (18,372)
Ending balance (3,104) (4,096) (3,104) (4,096)
Defined Benefit Pension Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 0 (4) 0 137
Other comprehensive income (loss) before    reclassifications 0 0 0 0
Amounts reclassified from AOCI to income 0 4 0 (137)
Ending balance $ 0 $ 0 $ 0 $ 0