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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance $ 8,126,387 $ 6,075,072 $ 6,340,350 $ 5,562,900
Other comprehensive income (loss) before reclassifications 69,780 180,398 207,405 114,168
Amounts reclassified from AOCI to income 5,437 7,254 14,247 20,885
Ending balance 8,309,271 6,367,298 8,309,271 6,367,298
Accumulated Other Comprehensive Income (Loss)        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (599,608) (791,408) (746,043) (738,809)
Ending balance (524,391) (603,756) (524,391) (603,756)
Unrealized Gains and Losses on Available-for-Sale Debt Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (542,158) (699,318) (668,063) (652,518)
Other comprehensive income (loss) before reclassifications 70,964 162,861 196,782 116,051
Amounts reclassified from AOCI to income (5) 57 82 67
Ending balance (471,199) (536,400) (471,199) (536,400)
Unrecognized Gains and Losses on Held-to-Maturity Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance (76,336) (88,986) (82,294) (95,472)
Other comprehensive income (loss) before reclassifications 0 0 0 0
Amounts reclassified from AOCI to income 3,014 3,537 8,972 10,023
Ending balance (73,322) (85,449) (73,322) (85,449)
Gains and Losses on Hedges        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Beginning balance 18,886 (3,104) 4,314 9,181
Other comprehensive income (loss) before reclassifications (1,184) 17,537 10,623 (1,883)
Amounts reclassified from AOCI to income 2,428 3,660 5,193 10,795
Ending balance $ 20,130 $ 18,093 $ 20,130 $ 18,093