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Statement of Cash Flows (Parenthetical) (USD $)
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Statement of Cash Flows [Abstract]    
Deposits from Other FHLBanks for MPF program $ 5,016,000 $ (3,197,000)
Proceeds from sale of long-term AFS securities 0 138,461,000
Proceeds from Bonds Transferred from Other Federal Home Loan Banks $ 0 $ 0