SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
 1 Months Ended 4 Months Ended 12 Months Ended
Dec. 31, 2015
USD ($)
shares
Sep. 28, 2015
Aug. 31, 2015
Nov. 06, 2014
Jul. 03, 2014
Mar. 27, 2014
Feb. 24, 2014
Sep. 10, 2013
Dec. 31, 2015
USD ($)
shares
Nov. 06, 2014
Dec. 31, 2015
USD ($)
state
shares
Dec. 31, 2014
USD ($)
shares
Dec. 31, 2013
USD ($)
Dec. 31, 2012
USD ($)
Property, Plant and Equipment [Line Items]                            
Impairment of intangible assets $ 2,400,000                          
Common stock, shares authorized (in shares) | shares 125,000,000               125,000,000   125,000,000 125,000,000    
Stock split conversion ratio (percentage)     0.25                      
Cash and cash equivalents $ 78,756,000 [1]               $ 78,756,000 [1]   $ 78,756,000 [1] $ 79,905,000 [1] $ 262,270,000 $ 85,278,000
Number of states where the Company originates loans | state                     41      
Impairment charges                       0 $ 0  
Preferred stock, shares authorized (in shares) | shares 100,000,000               100,000,000   100,000,000      
Prime Brokerage Account [Member]                            
Property, Plant and Equipment [Line Items]                            
Cash and cash equivalents $ 25,900,000               $ 25,900,000   $ 25,900,000 31,800,000    
Money Market Account [Member]                            
Property, Plant and Equipment [Line Items]                            
Cash and cash equivalents 44,500,000               44,500,000   44,500,000 32,600,000    
Checking Accounts [Member]                            
Property, Plant and Equipment [Line Items]                            
Cash and cash equivalents 8,400,000               8,400,000   8,400,000 15,400,000    
Accounts at Investment Properties [Member]                            
Property, Plant and Equipment [Line Items]                            
Cash and cash equivalents $ 0               $ 0   $ 0 $ 100,000.0    
Harvest CLO VII Limited [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]                            
Property, Plant and Equipment [Line Items]                            
Ownership percentage in VIE               9.50%            
Moselle CLO S.A. [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]                            
Property, Plant and Equipment [Line Items]                            
Ownership percentage in VIE             88.60%              
Harvest CLO VIII Limited [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]                            
Property, Plant and Equipment [Line Items]                            
Ownership percentage in VIE           12.60%                
Harvest X Investor [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]                            
Property, Plant and Equipment [Line Items]                            
Ownership percentage in VIE         55.00%         55.00%        
Harvest CLO X [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]                            
Property, Plant and Equipment [Line Items]                            
Ownership percentage in VIE       32.10%                    
Harvest CLO XV [Member] | Variable Interest Entity, Not Primary Beneficiary [Member]                            
Property, Plant and Equipment [Line Items]                            
Ownership percentage in VIE   100.00%             66.00%          
[1] December 31, 2015December 31, 2014Assets of consolidated Variable Interest Entities ("VIEs") included in the total assets above: Cash and cash equivalents $95 $25 Restricted cash$39,061 $121,247 Investments securities available-for-sale, pledged as collateral, at fair value66,137 119,203 Loans held for sale1,475 282Loans, pledged as collateral and net of allowances of $3.3 million and $8.8 million1,416,441 1,261,137 Interest receivable6,592 8,941 Prepaid expenses238 221 Principal paydown receivable17,800 25,767 Other assets833 (12) Total assets of consolidated VIEs$1,548,672 $1,536,811