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Other Assets - Mortgage Servicing Rights - Quantitative Assumptions Used for MSRs (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Minimum    
Quantitative assumptions used in determining lower of cost or fair value of MSRs    
Conditional prepayment rate (as a percent) 6.30% 6.99%
Life in years (of the MSR) 6 years 2 months 26 days 4 years 1 month 20 days
Weighted-average coupon rate (as a percent) 3.76% 3.71%
Discount rate (as a percent) 10.36% 10.35%
Maximum    
Quantitative assumptions used in determining lower of cost or fair value of MSRs    
Conditional prepayment rate (as a percent) 6.91% 11.77%
Life in years (of the MSR) 7 years 1 month 24 days 7 years 7 days
Weighted-average coupon rate (as a percent) 4.11% 5.66%
Discount rate (as a percent) 10.45% 10.94%
Weighted Average    
Quantitative assumptions used in determining lower of cost or fair value of MSRs    
Conditional prepayment rate (as a percent) 6.78% 7.16%
Life in years (of the MSR) 6 years 11 months 26 days 6 years 11 months 8 days
Weighted-average coupon rate (as a percent) 3.83% 3.80%
Discount rate (as a percent) 10.40% 10.40%