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Loans and Investments (Details 6)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
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Jun. 30, 2015
USD ($)
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Jun. 30, 2014
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Troubled debt restructurings by asset class      
Unfunded commitments on modified loans classified as troubled debt restructurings | $   $ 0  
Number of loans considered to be troubled debt restructurings that subsequently considered non-performing 0 0 0
Number of additional loans considered to be troubled debt restructurings   0 0
Multifamily      
Troubled debt restructurings by asset class      
Number of loans considered to be troubled debt restructurings 4 5  
Original Unpaid Principal Balance | $ $ 29,416,546 $ 35,609,122  
Original Weighted Average Rate of Interest (as a percent) 4.95% 5.12%  
Modified Unpaid Principal Balance | $ $ 29,416,456 $ 35,609,122  
Modified Weighted Average Rate of Interest (as a percent) 4.95% 5.12%