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Mortgage Servicing - Summary of Delinquency Status of Loans Underlying Mortgage Servicing Rights (Details)
Sep. 30, 2022
Dec. 31, 2021
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 10.20% 10.50%
30 days    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 4.30% 4.10%
60 days    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 1.50% 1.60%
90 days or more    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 4.40% 4.80%
Fair Value Agency Mortgage Servicing Rights    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 3.10% 3.70%
Fair Value Agency Mortgage Servicing Rights | 30 days    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 1.50% 1.40%
Fair Value Agency Mortgage Servicing Rights | 60 days    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 0.40% 0.40%
Fair Value Agency Mortgage Servicing Rights | 90 days or more    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 1.20% 1.90%
Fair Value Non-Agency Mortgage Servicing Rights    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 18.70% 18.00%
Fair Value Non-Agency Mortgage Servicing Rights | 30 days    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 7.60% 7.20%
Fair Value Non-Agency Mortgage Servicing Rights | 60 days    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 2.90% 2.80%
Fair Value Non-Agency Mortgage Servicing Rights | 90 days or more    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 8.20% 8.00%