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Mortgage Servicing Rights - Quantitative Assumptions Used for MSRs (Details)
 3 Months Ended 12 Months Ended
Mar. 31, 2023
Dec. 31, 2022
Minimum    
Quantitative assumptions used in determining lower of cost or fair value of MSRs    
Conditional prepayment rate (as a percent) 6.92% 7.02%
Life in years (of the MSR) 3 years 7 months 9 days 3 years 4 months 6 days
Weighted-average coupon rate (as a percent) 3.55% 3.55%
Discount rate (as a percent) 10.40% 10.41%
Maximum    
Quantitative assumptions used in determining lower of cost or fair value of MSRs    
Conditional prepayment rate (as a percent) 12.25% 13.58%
Life in years (of the MSR) 7 years 3 months 29 days 7 years 4 months 13 days
Weighted-average coupon rate (as a percent) 6.16% 6.24%
Discount rate (as a percent) 10.57% 10.54%
Weighted Average    
Quantitative assumptions used in determining lower of cost or fair value of MSRs    
Conditional prepayment rate (as a percent) 7.04% 7.11%
Life in years (of the MSR) 7 years 2 months 4 days 7 years 2 months 12 days
Weighted-average coupon rate (as a percent) 3.68% 3.68%
Discount rate (as a percent) 10.52% 10.51%