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Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]      
Goodwill impairment $ 0 $ 0 $ 0
Impairment of core deposits and intangibles 0 0 0
Net impairment (recovery of impairment) on loan servicing rights 0 0 0
Amortization expense - other intangible assets 30,400,000 35,000,000.0 39,800,000
Residential mortgage      
Finite-Lived Intangible Assets [Line Items]      
Aggregate principal balances of mortgage loans serviced $ 3,100,000,000 $ 3,300,000,000 $ 3,300,000,000
Core deposits      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life of acquired intangible assets 10 years    
Other      
Finite-Lived Intangible Assets [Line Items]      
Estimated useful life of acquired intangible assets 13 years 7 months 6 days