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Fair Value, Carrying Value and Estimated Fair Value (Details) - USD ($)
 9 Months Ended
Sep. 30, 2017
Jan. 31, 2017
Dec. 31, 2016
Oct. 31, 2016
Financial assets:        
Loans and investments, net - Principal/Notional Amount $ 2,094,376,123   $ 1,790,159,966  
Loans and investments, net 1,997,555,985   1,695,732,351  
Loans held-for-sale, net - Principal/Notional Amount 333,983,865   675,493,536  
Available-for-sale securities - Principal/Notional Amount 58,789   58,789  
Available-for-sale securities 4,707,085   5,403,463  
Securities, held-to-maturity - Principal/Notional Amount 28,035,293      
Securities held-to-maturity 18,851,089      
Derivative financial instruments - Principal/Notional Amount 100,898,203   550,117,700  
Financial liabilities:        
Credit and repurchase facilities, Principal/Notional Amount 564,231,866   908,680,198  
Credit and repurchase facilities 562,326,537   906,636,790  
Collateralized loan obligations 1,066,230,488   728,441,109  
Senior unsecured notes 95,088,379   94,521,566  
Convertible senior unsecured notes, net 95,381,121   80,660,038  
Junior subordinated notes 139,418,416   157,858,555  
Related party financing 50,000,000   50,000,000  
Derivative financial instruments - Principal/Notional Amount $ 287,993,000   522,650,829  
Loans held-for-sale, net        
Maximum Period of Loans Held-for-Sale Sold 60 days      
Carrying Value        
Financial assets:        
Loans and investments, net $ 1,997,555,985   1,695,732,351  
Loans held-for-sale, net 333,267,976   673,367,304  
Capitalized mortgage servicing rights, net 247,875,659   227,742,986  
Available-for-sale securities 4,707,085   5,403,463  
Securities held-to-maturity 18,851,089      
Derivative financial instruments 488,747   5,614,990  
Financial liabilities:        
Credit and repurchase facilities 562,326,537   906,636,790  
Collateralized loan obligations 1,066,230,488   728,441,109  
Senior unsecured notes 95,088,379   94,521,566  
Convertible senior unsecured notes, net 95,381,121   80,660,038  
Junior subordinated notes 139,418,416   157,858,555  
Related party financing 50,000,000   50,000,000  
Derivative financial instruments 1,881,450   2,451,422  
Fair Value        
Financial assets:        
Loans and investments, net 2,056,020,469   1,749,130,232  
Loans held-for-sale, net 338,766,761   683,833,449  
Capitalized mortgage servicing rights, net 293,807,076   245,455,881  
Available-for-sale securities 4,707,085   5,403,463  
Securities held-to-maturity 18,882,997      
Derivative financial instruments 488,747   5,614,990  
Financial liabilities:        
Credit and repurchase facilities 563,366,477   907,882,886  
Collateralized loan obligations 1,080,228,695   728,642,500  
Senior unsecured notes 99,817,226   99,034,345  
Convertible senior unsecured notes, net 105,438,000   86,586,375  
Junior subordinated notes 93,833,687   105,649,537  
Related party financing 53,270,857   55,119,744  
Derivative financial instruments 1,881,450   2,451,422  
CLOs        
Financial liabilities:        
Debt instrument - Principal/Notional Amount 1,079,874,000   737,000,000  
Collateralized loan obligations 1,066,230,488   728,441,109  
Senior Unsecured Notes        
Financial liabilities:        
Debt instrument - Principal/Notional Amount 97,860,025   97,860,025  
Collateralized loan obligations 95,100,000   94,500,000  
Convertible Senior Unsecured Notes        
Financial liabilities:        
Debt instrument - Principal/Notional Amount 100,000,000 $ 100,000,000 86,250,000 $ 86,300,000
Junior subordinated notes        
Financial liabilities:        
Debt instrument - Principal/Notional Amount 154,336,000   175,858,000  
Junior subordinated notes $ 139,400,000   $ 157,900,000