Consolidated Obligations Callable/Non-callable (Details) (Unsecured Debt [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Long-term Debt Callable or Non-Callable [Line Items]
Debt, Gross	$ 22,085,410	$ 25,573,230
Non Callable [Member]
Long-term Debt Callable or Non-Callable [Line Items]
Debt, Gross	17,013,335	21,088,230
Callable [Member]
Long-term Debt Callable or Non-Callable [Line Items]
Debt, Gross	$ 5,072,075	$ 4,485,000