Variable Interest Entities Property Asset Carrying Value and Maximum Exposure (Details) (USD $)	Mar. 31, 2013
Ashley Square [Member]
Maximum Exposure to Loss	$ 11,919,364
Carrying Value	6,881,342
Ashley Square [Member] | Tax-exempt mortgage revenue bonds [Member]
Maximum Exposure to Loss	5,248,000
Carrying Value	5,583,342
Ashley Square [Member] | Property Loan [Member]
Maximum Exposure to Loss	6,671,364
Carrying Value	1,298,000
Cross Creek [Member]
Maximum Exposure to Loss	9,462,996
Carrying Value	11,615,679
Cross Creek [Member] | Tax-exempt mortgage revenue bonds [Member]
Maximum Exposure to Loss	6,014,381
Carrying Value	8,167,064
Cross Creek [Member] | Property Loan [Member]
Maximum Exposure to Loss	3,448,615
Carrying Value	$ 3,448,615