Advances (Interest Rate Payment Terms) (Details) $ in Thousands |
Sep. 30, 2025
USD ($)
|
Dec. 31, 2024
USD ($)
|
|---|---|---|
| Federal Home Loan Bank, Advances, Fixed Rate [Abstract] | ||
| Fixed rate – overnight | $ 2,703,462 | $ 1,503,283 |
| Due in 1 year or less | 11,824,166 | 11,217,969 |
| Thereafter | 8,108,626 | 9,708,373 |
| Total Fixed Rate | 22,636,254 | 22,429,625 |
| Federal Home Loan Bank, Advances, Floating Rate [Abstract] | ||
| Due in 1 year or less | 12,108,815 | 38,253,010 |
| Thereafter | 7,450,000 | 9,345,000 |
| Total Variable Rate | 19,558,815 | 47,598,010 |
| Total Par Value | 42,195,069 | 70,027,635 |
| Federal Home Loan Bank, Advances, Five Largest Borrowers Amount Outstanding | $ 29,200,000 | $ 56,400,000 |
| Number Of Top Advances Borrowers | 5 | 5 |
| Federal Home Loan Bank, Advances, Borrowers With Outstanding Loan Balances Greater Than Ten Percent | 2 | 2 |