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Transactions with Related Parties Acquisition Fees (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2011
Jun. 30, 2012
Public housing capital fund trusts [Member]
Jun. 30, 2012
Arbors at Hickory Ridge [Member]
Tax-exempt mortgage revenue bonds [Member]
Related Party Transaction [Line Items]        
Debt Instrument, Unamortized Premium     $ 653,000 $ 100,000
Acquisition Costs, Cumulative 0      
Fees and Commissions, Other   $ 407,000