v3.26.3
Mortgage Servicing - Summary of Delinquency Status of Loans Underlying Mortgage Servicing Rights (Details) - USD ($)
$ in Billions
Sep. 30, 2026
Dec. 31, 2025
Participating Mortgage Loans [Line Items]    
Assets serviced $ 199.8 $ 191.1
Percent of aggregate unpaid principal balance 4.40% 5.70%
Financial Asset, 30 to 59 Days Past Due [Member]    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 2.20% 2.90%
Financial Asset, 60 to 89 Days Past Due [Member]    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 0.70% 1.00%
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 1.50% 1.90%
Fair Value Non-Agency Mortgage Servicing Rights    
Participating Mortgage Loans [Line Items]    
Assets serviced $ 13.1 $ 19.5
Percent of aggregate unpaid principal balance 14.00% 17.50%
Fair Value Non-Agency Mortgage Servicing Rights | Financial Asset, 30 to 59 Days Past Due [Member]    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 6.60% 8.50%
Fair Value Non-Agency Mortgage Servicing Rights | Financial Asset, 60 to 89 Days Past Due [Member]    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 2.10% 2.90%
Fair Value Non-Agency Mortgage Servicing Rights | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 5.30% 6.10%
Fair Value GSE Mortgage Servicing Rights    
Participating Mortgage Loans [Line Items]    
Assets serviced $ 146.7 $ 143.5
Percent of aggregate unpaid principal balance 1.70% 1.70%
Fair Value GSE Mortgage Servicing Rights | Financial Asset, 30 to 59 Days Past Due [Member]    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 1.00% 1.00%
Fair Value GSE Mortgage Servicing Rights | Financial Asset, 60 to 89 Days Past Due [Member]    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 0.30% 0.30%
Fair Value GSE Mortgage Servicing Rights | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 0.40% 0.40%
Fair Value GNMA Mortgage Servicing Rights    
Participating Mortgage Loans [Line Items]    
Assets serviced $ 40.0 $ 28.1
Percent of aggregate unpaid principal balance 8.00% 9.90%
Fair Value GNMA Mortgage Servicing Rights | Financial Asset, 30 to 59 Days Past Due [Member]    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 3.70% 4.90%
Fair Value GNMA Mortgage Servicing Rights | Financial Asset, 60 to 89 Days Past Due [Member]    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 1.20% 1.70%
Fair Value GNMA Mortgage Servicing Rights | Financial Asset, Equal to or Greater than 90 Days Past Due [Member]    
Participating Mortgage Loans [Line Items]    
Percent of aggregate unpaid principal balance 3.10% 3.40%