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Mortgage-Backed Securities - By Maturity (Details) (USD $)
Sep. 30, 2012
Dec. 31, 2011
Mortgage Backed Securities By Maturity [Abstract]    
Less than one year $ 0 $ 102,000
Greater than one year and less than five years 168,000 263,000
Greater than five years and less than ten years 11,252,000 8,507,000
Greater than or equal to ten years 114,319,000 82,270,000
Total mortgage-backed securities $ 125,738,976 $ 91,142,253