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AVAILABLE-FOR-SALE SECURITIES (Details 1) (USD $)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]      
Face Value $ 709,783,048oaks_AvailableForSaleSecuritiesAmortizedCostFaceValue $ 386,463,099oaks_AvailableForSaleSecuritiesAmortizedCostFaceValue  
Unamortized premium 4,681,293oaks_AvailableForSaleSecuritiesAmortizedCostUnamortizedPremium 4,796,106oaks_AvailableForSaleSecuritiesAmortizedCostUnamortizedPremium  
Unamortized discount      
Designated credit reserve (51,699,067)oaks_AvailableForSaleSecuritiesAmortizedCostUnamortizedDiscountDesignatedCreditReserve (12,697,796)oaks_AvailableForSaleSecuritiesAmortizedCostUnamortizedDiscountDesignatedCreditReserve (16,126,355)oaks_AvailableForSaleSecuritiesAmortizedCostUnamortizedDiscountDesignatedCreditReserve
Net, unamortized (78,751,862)oaks_AvailableForSaleSecuritiesAmortizedCostNetUnamortizedDiscount (17,454,022)oaks_AvailableForSaleSecuritiesAmortizedCostNetUnamortizedDiscount (22,400,380)oaks_AvailableForSaleSecuritiesAmortizedCostNetUnamortizedDiscount
Amortized Cost 584,013,412us-gaap_AvailableForSaleSecuritiesAmortizedCost 361,107,387us-gaap_AvailableForSaleSecuritiesAmortizedCost  
Gross unrealized gain 19,582,353us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains 8,402,890us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains  
Gross unrealized (loss) (2,469,713)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss (1,194,539)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss  
Fair Value 601,126,052us-gaap_AvailableForSaleSecurities 368,315,738us-gaap_AvailableForSaleSecurities  
Agency [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Face Value 301,677,275oaks_AvailableForSaleSecuritiesAmortizedCostFaceValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_AgencyMember		 309,790,551oaks_AvailableForSaleSecuritiesAmortizedCostFaceValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_AgencyMember		  
Unamortized premium 4,681,293oaks_AvailableForSaleSecuritiesAmortizedCostUnamortizedPremium
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_AgencyMember		 4,796,106oaks_AvailableForSaleSecuritiesAmortizedCostUnamortizedPremium
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_AgencyMember		  
Unamortized discount      
Designated credit reserve 0oaks_AvailableForSaleSecuritiesAmortizedCostUnamortizedDiscountDesignatedCreditReserve
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_AgencyMember		 0oaks_AvailableForSaleSecuritiesAmortizedCostUnamortizedDiscountDesignatedCreditReserve
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_AgencyMember		  
Net, unamortized (2,062,001)oaks_AvailableForSaleSecuritiesAmortizedCostNetUnamortizedDiscount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_AgencyMember		 (2,244,687)oaks_AvailableForSaleSecuritiesAmortizedCostNetUnamortizedDiscount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_AgencyMember		  
Amortized Cost 304,296,567us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_AgencyMember		 312,341,970us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_AgencyMember		  
Gross unrealized gain 6,078,280us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_AgencyMember		 3,670,643us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_AgencyMember		  
Gross unrealized (loss) (328,758)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_AgencyMember		 (1,181,928)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_AgencyMember		  
Fair Value 310,046,089us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_AgencyMember		 314,830,685us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_AgencyMember		  
Non Agency RMBS [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Face Value 254,443,355oaks_AvailableForSaleSecuritiesAmortizedCostFaceValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_NonAgencyRmbsMember		 76,672,548oaks_AvailableForSaleSecuritiesAmortizedCostFaceValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_NonAgencyRmbsMember		  
Unamortized premium 0oaks_AvailableForSaleSecuritiesAmortizedCostUnamortizedPremium
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_NonAgencyRmbsMember		 0oaks_AvailableForSaleSecuritiesAmortizedCostUnamortizedPremium
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_NonAgencyRmbsMember		  
Unamortized discount      
Designated credit reserve (51,699,067)oaks_AvailableForSaleSecuritiesAmortizedCostUnamortizedDiscountDesignatedCreditReserve
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_NonAgencyRmbsMember		 [1] (12,697,796)oaks_AvailableForSaleSecuritiesAmortizedCostUnamortizedDiscountDesignatedCreditReserve
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_NonAgencyRmbsMember		  
Net, unamortized (39,141,722)oaks_AvailableForSaleSecuritiesAmortizedCostNetUnamortizedDiscount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_NonAgencyRmbsMember		 (15,209,335)oaks_AvailableForSaleSecuritiesAmortizedCostNetUnamortizedDiscount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_NonAgencyRmbsMember		  
Amortized Cost 163,602,566us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_NonAgencyRmbsMember		 48,765,417us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_NonAgencyRmbsMember		  
Gross unrealized gain 10,224,492us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_NonAgencyRmbsMember		 4,732,247us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_NonAgencyRmbsMember		  
Gross unrealized (loss) (1,912,145)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_NonAgencyRmbsMember		 (12,611)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_NonAgencyRmbsMember		  
Fair Value 171,914,913us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_NonAgencyRmbsMember		 53,485,053us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_NonAgencyRmbsMember		  
Multi-Family [Member]      
Schedule of Available-for-sale Securities [Line Items]      
Face Value 153,662,418oaks_AvailableForSaleSecuritiesAmortizedCostFaceValue
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_ResidentialMultiFamilyMember		    
Unamortized premium 0oaks_AvailableForSaleSecuritiesAmortizedCostUnamortizedPremium
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_ResidentialMultiFamilyMember		    
Unamortized discount      
Designated credit reserve 0oaks_AvailableForSaleSecuritiesAmortizedCostUnamortizedDiscountDesignatedCreditReserve
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_ResidentialMultiFamilyMember		    
Net, unamortized (37,548,139)oaks_AvailableForSaleSecuritiesAmortizedCostNetUnamortizedDiscount
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_ResidentialMultiFamilyMember		    
Amortized Cost 116,114,279us-gaap_AvailableForSaleSecuritiesAmortizedCost
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_ResidentialMultiFamilyMember		    
Gross unrealized gain 3,279,581us-gaap_AvailableForSaleSecuritiesGrossUnrealizedGains
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_ResidentialMultiFamilyMember		    
Gross unrealized (loss) (228,810)us-gaap_AvailableForSaleSecuritiesGrossUnrealizedLoss
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_ResidentialMultiFamilyMember		    
Fair Value $ 119,165,050us-gaap_AvailableForSaleSecurities
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= oaks_ResidentialMultiFamilyMember		    
[1] Discount designated as Credit Reserve and amount related to OTTI are generally not expected to be accreted into interest income. Amounts disclosed at March 31, 2015 reflect Credit Reserve of $2.0 million and OTTI of $2.9 million.