Annual report pursuant to Section 13 and 15(d)

LOANS - Narrative (Details)

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LOANS - Narrative (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended 24 Months Ended
Aug. 31, 2017
Sep. 30, 2016
Apr. 30, 2016
Dec. 31, 2015
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Repayment of debt       $ 11.5 $ 35.9 $ 39.3 $ 188.9 $ 787.8
Proceeds from notes receivable $ 69.5 $ 109.9            
Discount accretion recognized $ 5.5              
Loans, Held for Sale | Corporate Loans                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Proceeds from notes receivable   $ 109.9            
Loans, Held for Sale | Disposed of by sale | Mezzanine Loans                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Face amount of securities sold     $ 19.4          
Loans, Held for Sale | Disposed of by sale | Mezzanine Loans | Mezzanine Note Payable                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Repayment of debt     $ 11.7