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Other Assets - Mortgage Servicing Rights - Quantitative Assumptions Used for MSRs (Details)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Minimum    
Quantitative assumptions used in determining lower of cost or fair value of MSRs    
Conditional prepayment rate (as a percent) 6.99% 6.87%
Life in years (of the MSR) 4 years 1 month 20 days 4 years 3 months 18 days
Weighted-average coupon rate (as a percent) 3.71% 3.57%
Discount rate (as a percent) 10.35% 10.40%
Maximum    
Quantitative assumptions used in determining lower of cost or fair value of MSRs    
Conditional prepayment rate (as a percent) 11.77% 11.53%
Life in years (of the MSR) 7 years 7 days 7 years 2 months 19 days
Weighted-average coupon rate (as a percent) 5.66% 5.81%
Discount rate (as a percent) 10.94% 10.60%
Weighted Average    
Quantitative assumptions used in determining lower of cost or fair value of MSRs    
Conditional prepayment rate (as a percent) 7.16% 7.04%
Life in years (of the MSR) 6 years 11 months 8 days 7 years 1 month 2 days
Weighted-average coupon rate (as a percent) 3.80% 3.73%
Discount rate (as a percent) 10.40% 10.52%