Capital (Capital Requirements) (Details) $ in Thousands |
Sep. 30, 2025
USD ($)
numberOfRegulatoryRequirements
|
Dec. 31, 2024
USD ($)
|
|---|---|---|
| Banking Regulation, Total Capital [Abstract] | ||
| Number of Finance Agency Regulatory Capital Requirements | numberOfRegulatoryRequirements | 3 | |
| Number Of Subclasses Of Capital Stock | 2 | |
| Risk-Based Capital, Required | $ 901,639 | $ 950,558 |
| Risk-Based Capital, Actual | $ 4,709,510 | $ 5,671,613 |
| Total capital-to-asset ratio, Required | 4.00% | 4.00% |
| Total capital-to-asset ratio, Actual | 6.00% | 5.30% |
| Total regulatory capital, Actual | $ 4,709,510 | $ 5,671,613 |
| Leverage ratio - Required | 5.00% | 5.00% |
| Leverage ratio, Actual | 9.10% | 8.00% |
| Leverage capital, Required | $ 3,896,094 | $ 5,346,337 |
| Leverage capital, Actual | 7,064,264 | 8,507,419 |
| Total regulatory capital, Required | $ 3,116,875 | $ 4,277,070 |