Mortgage Servicing Rights - Quantitative Assumptions Used for MSRs (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Minimum
Quantitative assumptions used in determining lower of cost or fair value of MSRs
Conditional prepayment rate (as a percent)	6.96%	7.02%
Life in years (of the MSR)	3 years 11 months 19 days	3 years 4 months 6 days
Weighted-average coupon rate (as a percent)	3.55%	3.55%
Discount rate (as a percent)	10.36%	10.41%
Maximum
Quantitative assumptions used in determining lower of cost or fair value of MSRs
Conditional prepayment rate (as a percent)	11.63%	13.58%
Life in years (of the MSR)	7 years 3 months 14 days	7 years 4 months 13 days
Weighted-average coupon rate (as a percent)	5.91%	6.24%
Discount rate (as a percent)	10.53%	10.54%
Weighted Average
Quantitative assumptions used in determining lower of cost or fair value of MSRs
Conditional prepayment rate (as a percent)	7.07%	7.11%
Life in years (of the MSR)	7 years 1 month 17 days	7 years 2 months 12 days
Weighted-average coupon rate (as a percent)	3.69%	3.68%
Discount rate (as a percent)	10.51%	10.51%