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Mortgage Servicing - Summary of Delinquency Status of Loans Underlying Mortgage Servicing Rights (Details) - USD ($) $ in Billions | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Participating Mortgage Loans [Line Items] |  |  |
Assets serviced | $ 201.1 | $ 199.6 | $ 198.0
Percent of aggregate unpaid principal balance | 11.40% | 11.10% |
30 days |  |  |
Participating Mortgage Loans [Line Items] |  |  |
Percent of aggregate unpaid principal balance | 5.20% | 4.80% |
60 days |  |  |
Participating Mortgage Loans [Line Items] |  |  |
Percent of aggregate unpaid principal balance | 1.90% | 1.80% |
90 days or more |  |  |
Participating Mortgage Loans [Line Items] |  |  |
Percent of aggregate unpaid principal balance | 4.20% | 4.50% |
Fair Value Agency Mortgage Servicing Rights |  |  |
Participating Mortgage Loans [Line Items] |  |  |
Assets serviced | $ 143.1 | $ 137.6 |
Percent of aggregate unpaid principal balance | 3.40% | 3.30% |
Fair Value Agency Mortgage Servicing Rights | 30 days |  |  |
Participating Mortgage Loans [Line Items] |  |  |
Percent of aggregate unpaid principal balance | 1.90% | 1.70% |
Fair Value Agency Mortgage Servicing Rights | 60 days |  |  |
Participating Mortgage Loans [Line Items] |  |  |
Percent of aggregate unpaid principal balance | 0.50% | 0.50% |
Fair Value Agency Mortgage Servicing Rights | 90 days or more |  |  |
Participating Mortgage Loans [Line Items] |  |  |
Percent of aggregate unpaid principal balance | 1.00% | 1.10% |
Fair Value Non-Agency Mortgage Servicing Rights |  |  |
Participating Mortgage Loans [Line Items] |  |  |
Assets serviced | $ 57.9 | $ 62.0 |
Percent of aggregate unpaid principal balance | 22.00% | 20.40% |
Fair Value Non-Agency Mortgage Servicing Rights | 30 days |  |  |
Participating Mortgage Loans [Line Items] |  |  |
Percent of aggregate unpaid principal balance | 9.70% | 8.50% |
Fair Value Non-Agency Mortgage Servicing Rights | 60 days |  |  |
Participating Mortgage Loans [Line Items] |  |  |
Percent of aggregate unpaid principal balance | 3.90% | 3.30% |
Fair Value Non-Agency Mortgage Servicing Rights | 90 days or more |  |  |
Participating Mortgage Loans [Line Items] |  |  |
Percent of aggregate unpaid principal balance | 8.50% | 8.60% |

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