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Loans and Investments (Details 3) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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Dec. 31, 2013
Loans and Investments          
Number of impaired loans 2 1 4 4  
Carrying value of impaired loan $ 144,700,000 $ 5,400,000 $ 158,500,000 $ 26,700,000  
Impaired loans, provision for loan losses 2,860,000 1,500,000 7,810,000 5,500,000  
Loans and Investments          
Provision for loan losses (net of recoveries) 1,326,538 750,231 590,695 4,072,108  
Number of impaired loans 12 15 12 15  
Aggregate carrying value of impaired loans before reserves 228,576,231   228,576,231   207,471,246
Charge-offs to previously recorded reserves   4,295,506 6,501,079 22,756,836  
Principal paydowns of loan sold     (694,560,068) (199,325,600)  
Changes in allowance for loan losses          
Allowance at beginning of the period 115,059,988 146,563,765 122,277,411 161,706,313  
Provision for loan losses 2,860,000 1,500,000 7,810,000 5,500,000  
Charge-offs   (4,295,506) (6,501,079) (22,756,836)  
Recoveries of reserves (1,533,462) (749,768) (7,199,806) (1,430,986)  
Allowance at end of the period 116,386,526 143,018,491 116,386,526 143,018,491  
Bridge loan, two mezzanine loans, and two junior participating loans
          
Loans and Investments          
Charge-offs to previously recorded reserves       1,500,000  
Changes in allowance for loan losses          
Charge-offs       21,300,000  
Mezzanine Loans
          
Loans and Investments          
Number of loans written off       2  
Changes in allowance for loan losses          
Charge-offs     6,500,000    
Junior participating loans
          
Loans and Investments          
Charge-offs to previously recorded reserves   1,500,000      
Number of loans written off       2  
Changes in allowance for loan losses          
Charge-offs   2,800,000      
Seven loans collateralized by a land development project | Maturity date of September 2014
          
Loans and Investments          
Number of loans with unpaid principal balance     7    
Unpaid principal balance on loans 114,300,000   114,300,000    
Changes in allowance for loan losses          
Allowance at end of the period 45,300,000   45,300,000    
Four loans collateralized by a land development project | Maturity date of September 2014
          
Loans and Investments          
Number of loans with unpaid principal balance     4    
Unpaid principal balance on loans $ 101,900,000   $ 101,900,000    
Weighted average accrual rate of interest (as a percent)     9.60%