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Variable Interest Entities Property Asset Carrying Value and Maximum Exposure (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Ashley Square [Member]
   
Maximum Exposure to Loss $ 11,835,664 $ 11,425,528
Carrying Value 6,804,981 6,498,000
Ashley Square [Member] | Tax-exempt mortgage revenue bonds [Member]
   
Maximum Exposure to Loss 5,260,000 5,308,000
Carrying Value 5,506,981 5,308,000
Ashley Square [Member] | Property Loan [Member]
   
Maximum Exposure to Loss 6,575,664 6,117,528
Carrying Value 1,298,000 1,190,000
Cross Creek [Member]
   
Maximum Exposure to Loss 9,388,039 9,526,233
Carrying Value 11,382,950 11,350,400
Cross Creek [Member] | Tax-exempt mortgage revenue bonds [Member]
   
Maximum Exposure to Loss 6,004,424 5,961,478
Carrying Value 7,999,335 7,785,645
Cross Creek [Member] | Property Loan [Member]
   
Maximum Exposure to Loss 3,383,615 3,564,755
Carrying Value $ 3,383,615 $ 3,564,755