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THE FREMF TRUSTS (Details 2) (FREMF trusts [Member])
 3 Months Ended
Mar. 31, 2015
Texas
  
Concentration Risk [Line Items]  
Concentration Risk, Percentage 19.60%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_StatementGeographicalAxis
= stpr_TX
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= oaks_FremfTrustsMember
California
  
Concentration Risk [Line Items]  
Concentration Risk, Percentage 12.20%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_StatementGeographicalAxis
= stpr_CA
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= oaks_FremfTrustsMember
New York
  
Concentration Risk [Line Items]  
Concentration Risk, Percentage 11.70%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_StatementGeographicalAxis
= stpr_NY
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= oaks_FremfTrustsMember
Washington
  
Concentration Risk [Line Items]  
Concentration Risk, Percentage 6.40%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_StatementGeographicalAxis
= stpr_WA
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= oaks_FremfTrustsMember
Colorado
  
Concentration Risk [Line Items]  
Concentration Risk, Percentage 6.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_StatementGeographicalAxis
= stpr_CO
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= oaks_FremfTrustsMember
Georgia
  
Concentration Risk [Line Items]  
Concentration Risk, Percentage 5.30%us-gaap_ConcentrationRiskPercentage1
/ us-gaap_StatementGeographicalAxis
= stpr_GA
/ us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis
= oaks_FremfTrustsMember