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Capital (Mandatorily Redeemable Capital Stock by Contractual Year of Redemption) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Dec. 31, 2010
Capital [Abstract]        
Due in 1 year or less $ 58 $ 0    
Due after 1 year through 2 years 2,673 71    
Due after 2 years through 3 years 19,749 3,276    
Due after 3 years through 4 years 14,795 25,038    
Due after 4 years through 5 years 150,853 17,288    
Total $ 188,128 $ 45,673 $ 48,077 $ 34,215