| Amount of increase (decrease) of obligation related to Affordable Housing Program (AHP) assessments required by the Federal Home Loan Bank Act of 1932. | en-US | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Affordable Housing Program Obligation, Period Increase (Decrease) | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Affordable Housing Program Obligation, Period Increase (Decrease), Total | en-US | http://www.xbrl.org/2003/role/totalLabel | http://www.xbrl.org/2003/role/link |