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Loans and Investments (Details 5)
 6 Months Ended 12 Months Ended
Jun. 30, 2015
USD ($)
loan
item
Dec. 31, 2014
USD ($)
loan
item
Non-performing loans by asset class    
Number of loans | item 146 139
Carrying value of loans before loan loss reserves $ 1,595,706,784 $ 1,587,429,498
Non-performing loans    
Non-performing loans by asset class    
Number of loans | item 3 3
Carrying value of loans before loan loss reserves $ 6,500,000 $ 7,000,000
Loan loss reserves $ 34,500,000 $ 34,000,000
Number of loans classified as non-performing which have loan loss reserve | loan 2 2
Carrying Value $ 41,043,519 $ 41,043,556
Less Than 90 Days Past Due   765,799
Greater Than 90 Days Past Due 41,043,519 40,277,757
Multifamily | Non-performing loans    
Non-performing loans by asset class    
Carrying Value 32,765,799 32,765,799
Less Than 90 Days Past Due   765,799
Greater Than 90 Days Past Due 32,765,799 32,000,000
Office | Non-performing loans    
Non-performing loans by asset class    
Carrying Value 8,277,720 8,277,757
Greater Than 90 Days Past Due $ 8,277,720 $ 8,277,757