Advances (Interest Rate Payment Terms) (Details) $ in Thousands |
Jun. 30, 2026
USD ($)
|
Dec. 31, 2025
USD ($)
|
|---|---|---|
| Federal Home Loan Bank, Advances, Fixed Rate [Abstract] | ||
| Fixed rate – overnight | $ 950,455 | $ 2,355,769 |
| Due in 1 year or less | 15,005,540 | 10,971,285 |
| Thereafter | 7,278,311 | 7,905,787 |
| Total Fixed Rate | 23,234,306 | 21,232,841 |
| Federal Home Loan Bank, Advances, Floating Rate [Abstract] | ||
| Due in 1 year or less | 34,091,951 | 10,005,925 |
| Thereafter | 20,466,545 | 5,605,000 |
| Total Variable Rate | 54,558,496 | 15,610,925 |
| Total Par Value | 77,792,802 | 36,843,766 |
| Federal Home Loan Bank, Advances, Five Largest Borrowers Amount Outstanding | $ 63,900,000 | $ 26,000,000 |
| Number Of Top Advances Borrowers | 5 | 5 |
| Federal Home Loan Bank, Advances, Borrowers With Outstanding Loan Balances Greater Than Ten Percent | 3 | 2 |