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Repurchase Agreements - Narrative (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Disclosure of Repurchase Agreements [Abstract]    
Repurchase agreements, net $ 107,121,103 $ 69,528,000
Repurchase Agreements Weighted Average Borrowing Rates 0.43% 0.43%
Fair Value of securities pledged, including accrued interest receivable $ 113,649,000 $ 73,305,000