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Accumulated Other Comprehensive Income (Loss) - Schedule of AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance $ 6,340,350 $ 5,562,900 $ 5,128,595
Other comprehensive income (loss) before       reclassifications 247,726 (33,638) 38,379
Amounts reclassified from AOCI to income 19,646 26,404 9,234
Ending Balance 8,494,788 6,340,350 5,562,900
Accumulated Other Comprehensive Income (Loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (746,043) (738,809) (786,422)
Ending Balance (478,671) (746,043) (738,809)
Unrealized Gains and Losses on Available-for-Sale Debt Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (668,063) (652,518) (642,346)
Other comprehensive income (loss) before       reclassifications 239,600 (15,702) (14,817)
Amounts reclassified from AOCI to income 27 157 4,645
Ending Balance (428,436) (668,063) (652,518)
Unrecognized Gains and Losses on Held-to-Maturity Securities      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance (82,294) (95,472) (112,664)
Other comprehensive income (loss) before       reclassifications 0 0 1,325
Amounts reclassified from AOCI to income 11,830 13,178 15,867
Ending Balance (70,464) (82,294) (95,472)
Gains and Losses on Hedges      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 4,314 9,181 (31,549)
Other comprehensive income (loss) before       reclassifications 8,126 (17,936) 51,871
Amounts reclassified from AOCI to income 7,789 13,069 (11,141)
Ending Balance 20,229 4,314 9,181
Defined Benefit Pension Plans      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning Balance 0 0 137
Other comprehensive income (loss) before       reclassifications 0 0 0
Amounts reclassified from AOCI to income     (137)
Ending Balance $ 0 $ 0 $ 0