Mortgage Loans Held-for-Portfolio - Schedule of MPF Mortgage Loans Held-for-portfolio by Collateral/Guarantee Type (Details) - USD ($) $ in Thousands |
Jun. 30, 2026 |
Dec. 31, 2025 |
|---|---|---|
| Financing Receivable, Allowance for Credit Loss [Line Items] | ||
| Total unpaid principal balance | $ 2,712,230 | $ 2,599,157 |
| Conventional mortgage loans | ||
| Financing Receivable, Allowance for Credit Loss [Line Items] | ||
| Total unpaid principal balance | 2,609,239 | 2,490,408 |
| Government-guaranteed or - insured mortgage loans | ||
| Financing Receivable, Allowance for Credit Loss [Line Items] | ||
| Total unpaid principal balance | $ 102,991 | $ 108,749 |