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Other Assets - Mortgage Servicing Rights - Quantitative Assumptions Used for MSRs (Details)
 6 Months Ended 12 Months Ended
Jun. 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) 6.29% 6.99%
Life in years (of the MSR) 4 years 5 months 15 days 4 years 1 month 20 days
Weighted-average coupon rate (as a percent) 3.72% 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) 11.72% 11.77%
Life in years (of the MSR) 7 years 2 months 12 days 7 years 7 days
Weighted-average coupon rate (as a percent) 5.47% 5.66%
Discount rate (as a percent) 10.93% 10.94%
Weighted Average    
Quantitative assumptions used in determining lower of cost or fair value of MSRs    
Conditional prepayment rate (as a percent) 6.69% 7.16%
Life in years (of the MSR) 7 years 21 days 6 years 11 months 8 days
Weighted-average coupon rate (as a percent) 3.82% 3.80%
Discount rate (as a percent) 10.40% 10.40%