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Restructurings for Borrowers Experiencing Financial Difficulty (Narrative) (Details) - Contract | 3 Months Ended | 9 Months Ended
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Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Financing Receivable Modifications [Line Items] |  |  |
Mortgage loans on real estate weighted average term |  | 1 year |
Number of payment defaults | 0 |  | 0
Residential Single Family |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Loan is considered payment default |  | 30 days |

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