Mortgage Loans Held-for-Portfolio - Schedule of MPF Mortgage Loans Held-for-portfolio by Collateral/Guarantee Type (Details) - USD ($) $ in Thousands |
Sep. 30, 2026 |
Dec. 31, 2025 |
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| Financing Receivable, Allowance for Credit Loss [Line Items] | ||
| Total unpaid principal balance | $ 2,866,013 | $ 2,599,157 |
| Conventional mortgage loans | ||
| Financing Receivable, Allowance for Credit Loss [Line Items] | ||
| Total unpaid principal balance | 2,764,709 | 2,490,408 |
| Government-guaranteed or - insured mortgage loans | ||
| Financing Receivable, Allowance for Credit Loss [Line Items] | ||
| Total unpaid principal balance | $ 101,304 | $ 108,749 |
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amortized cost excluding accrued interest, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes net investment in lease. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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