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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 6,075,072 $ 5,292,095 $ 5,562,900 $ 5,128,595
Other comprehensive income (loss) before    reclassifications 180,398 (168,206) 114,168 (183,958)
Amounts reclassified from AOCI to income 7,254 8,024 20,885 1,565
Ending balance 6,367,298 5,239,537 6,367,298 5,239,537
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (791,408) (808,633) (738,809) (786,422)
Ending balance (603,756) (968,815) (603,756) (968,815)
Unrealized Gains and Losses on Available- for-Sale Debt Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (699,318) (701,393) (652,518) (642,346)
Other comprehensive income (loss) before    reclassifications 162,861 (156,660) 116,051 (219,562)
Amounts reclassified from AOCI to income 57 178 67 4,033
Ending balance (536,400) (857,875) (536,400) (857,875)
Unrealized Gains and Losses on Held-to- Maturity Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (88,986) (103,144) (95,472) (112,664)
Other comprehensive income (loss) before    reclassifications 0 0 0 1,325
Amounts reclassified from AOCI to income 3,537 4,193 10,023 12,388
Ending balance (85,449) (98,951) (85,449) (98,951)
Gains and Losses on Hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (3,104) (4,096) 9,181 (31,549)
Other comprehensive income (loss) before    reclassifications 17,537 (11,546) (1,883) 34,279
Amounts reclassified from AOCI to income 3,660 3,653 10,795 (14,719)
Ending balance 18,093 (11,989) 18,093 (11,989)
Defined Benefit Pension Plans        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 0 0 0 137
Other comprehensive income (loss) before    reclassifications 0 0 0 0
Amounts reclassified from AOCI to income 0 0 0 (137)
Ending balance $ 0 $ 0 $ 0 $ 0