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Loans and Investments (Details 3)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
USD ($)
item
Jun. 30, 2014
USD ($)
item
Jun. 30, 2015
USD ($)
item
Jun. 30, 2014
USD ($)
item
Dec. 31, 2014
USD ($)
item
Loans and Investments          
Number of impaired loans | item   3 3 4  
Carrying value of impaired loan before loan loss reserves $ 114,800,000 $ 153,700,000 $ 127,800,000 $ 158,600,000  
Impaired loans, provision for loan losses 1,110,629 3,950,000 2,110,629 4,950,000  
Loans and Investments          
Provision for loan losses (net of recoveries) $ 1,093,544 (870,187) $ 2,076,224 (735,843)  
Number of impaired loans | item 10   10   10
Charge-offs to previously recorded reserves   832,737   6,501,079  
Proceeds from Payoffs and Paydowns of Loans and Investments     $ (551,201,085) (474,807,344)  
Aggregate carrying value of impaired loans before reserves $ 224,385,928   $ 224,385,928   $ 221,602,399
Number of loans for which no provision for loan loss made | item 0   0   0
Carry value of loans $ 114,800,000 153,700,000 $ 127,800,000 158,600,000  
Changes in allowance for loan losses          
Allowance at beginning of the period 116,470,000 116,743,412 115,487,320 122,277,411  
Provision for loan losses 1,110,629 3,950,000 2,110,629 4,950,000  
Charge-offs   (832,737)   (6,501,079)  
Recoveries of reserves (17,085) (4,800,687) (34,405) (5,666,344)  
Allowance at end of the period 117,563,544 $ 115,059,988 $ 117,563,544 $ 115,059,988  
Six loans collateralized by a land development project | Maturity date of September 2017          
Loans and Investments          
Carrying value of impaired loan before loan loss reserves 119,200,000        
Loans and Investments          
Number of loans with unpaid principal balance | item     6    
Carry value of loans 119,200,000        
Changes in allowance for loan losses          
Allowance at end of the period 47,600,000   $ 47,600,000    
Four loans collateralized by a land development project | Maturity date of September 2017          
Loans and Investments          
Carrying value of impaired loan before loan loss reserves 97,500,000        
Loans and Investments          
Number of loans with unpaid principal balance | item     4    
Carry value of loans $ 97,500,000        
Weighted average accrual rate of interest (as a percent)     9.60%