Variable Interest Entities Property Asset Carrying Value and Maximum Exposure (Details) (USD $)	Jun. 30, 2012
Ashley Square [Member]
Available for Sale Security and Property Loan Receivable, Maximum Exposure	$ 6,499,000
Available for Sale Security and Property Loan Receivable, Carrying Value	10,302,244
Ashley Square [Member] | Tax-exempt mortgage revenue bonds [Member]
Available for Sale Security and Property Loan Receivable, Maximum Exposure	5,284,000
Available for Sale Security and Property Loan Receivable, Carrying Value	5,490,902
Ashley Square [Member] | Loans Receivable [Member]
Available for Sale Security and Property Loan Receivable, Maximum Exposure	1,215,000
Available for Sale Security and Property Loan Receivable, Carrying Value	4,811,342
Cross Creek [Member]
Available for Sale Security and Property Loan Receivable, Maximum Exposure	9,367,179
Available for Sale Security and Property Loan Receivable, Carrying Value	11,320,360
Cross Creek [Member] | Tax-exempt mortgage revenue bonds [Member]
Available for Sale Security and Property Loan Receivable, Maximum Exposure	5,983,564
Available for Sale Security and Property Loan Receivable, Carrying Value	7,936,745
Cross Creek [Member] | Loans Receivable [Member]
Available for Sale Security and Property Loan Receivable, Maximum Exposure	3,383,615
Available for Sale Security and Property Loan Receivable, Carrying Value	$ 3,383,615