Other Assets - Mortgage Servicing Rights - Quantitative Assumptions Used for MSRs (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2023
Minimum
Quantitative assumptions used in determining lower of cost or fair value of MSRs
Conditional prepayment rate (as a percent)	6.89%	6.87%
Life in years (of the MSR)	4 years 7 months 9 days	4 years 3 months 18 days
Weighted-average coupon rate (as a percent)	3.66%	3.57%
Discount rate (as a percent)	10.36%	10.40%
Maximum
Quantitative assumptions used in determining lower of cost or fair value of MSRs
Conditional prepayment rate (as a percent)	11.22%	11.53%
Life in years (of the MSR)	7 years 2 months 1 day	7 years 2 months 19 days
Weighted-average coupon rate (as a percent)	5.71%	5.81%
Discount rate (as a percent)	10.87%	10.60%
Weighted Average
Quantitative assumptions used in determining lower of cost or fair value of MSRs
Conditional prepayment rate (as a percent)	6.98%	7.04%
Life in years (of the MSR)	7 years 21 days	7 years 1 month 2 days
Weighted-average coupon rate (as a percent)	3.77%	3.73%
Discount rate (as a percent)	10.41%	10.52%