Variable Interest Entities Property Asset Carrying Value and Maximum Exposure (Details) (USD $)	Sep. 30, 2013
Ashley Square [Member]
Maximum Exposure to Loss	$ 12,256,123
Carrying Value	6,686,000
Ashley Square [Member] | Tax-exempt mortgage revenue bonds [Member]
Maximum Exposure to Loss	5,224,000
Carrying Value	5,224,000
Ashley Square [Member] | Property Loan [Member]
Maximum Exposure to Loss	7,032,123
Carrying Value	1,462,000
Cross Creek [Member]
Maximum Exposure to Loss	9,416,932
Carrying Value	10,999,931
Cross Creek [Member] | Tax-exempt mortgage revenue bonds [Member]
Maximum Exposure to Loss	6,033,317
Carrying Value	7,616,316
Cross Creek [Member] | Property Loan [Member]
Maximum Exposure to Loss	3,383,615
Carrying Value	$ 3,383,615