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Capital (Mandatorily Redeemable Capital Stock by Contractual Year of Redemption) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Capital [Abstract]    
Due in 1 year or less $ 2,026 $ 1,750
Due after 1 year through 2 years 126,155 207,439
Due after 2 years through 3 years 130 130
Due after 3 years through 4 years 0 0
Due after 4 years through 5 years 4,191 0
Past contractual redemption date due to remaining activity 1,453 [1] 1,509 [1]
Total par value $ 133,955 $ 210,828
[1] Represents mandatorily redeemable capital stock that is past the end of the contractual redemption period because there is activity outstanding to which the mandatorily redeemable capital stock relates.