Annual report pursuant to Section 13 and 15(d)

REAL ESTATE RELATED LOANS, RESIDENTIAL MORTGAGE LOANS AND SUBPRIME MORTGAGE LOANS - Subprime Mortgage Loans (Details 8)

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REAL ESTATE RELATED LOANS, RESIDENTIAL MORTGAGE LOANS AND SUBPRIME MORTGAGE LOANS - Subprime Mortgage Loans (Details 8) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Total securitized loans (unpaid principal balance) $ 774,922us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized [1]  
Subprime mortgage loans subject to call option 406,217nct_SubprimeMortgageLoansSubjectToCallOption 406,217nct_SubprimeMortgageLoansSubjectToCallOption
Retained interests (fair value) 3,024us-gaap_RetainedInterestFairValueDisclosure [2]  
Subprime Portfolio I [Member]    
Total securitized loans (unpaid principal balance) 322,723us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nct_SubprimePortfolioIMember 		[1],[3] 372,661us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nct_SubprimePortfolioIMember 		[4]
Subprime mortgage loans subject to call option 299,176nct_SubprimeMortgageLoansSubjectToCallOption
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nct_SubprimePortfolioIMember 		 
Retained interests (fair value) 3,024us-gaap_RetainedInterestFairValueDisclosure
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nct_SubprimePortfolioIMember 		[2]  
Subprime Portfolio II [Member]    
Total securitized loans (unpaid principal balance) 452,199us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nct_SubprimePortfolioIIMember 		[1],[3] 506,620us-gaap_PrincipalAmountOutstandingOnLoansManagedAndSecuritized
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nct_SubprimePortfolioIIMember 		[4]
Subprime mortgage loans subject to call option $ 107,041nct_SubprimeMortgageLoansSubjectToCallOption
/ us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis
= nct_SubprimePortfolioIIMember 		 
[1] Average loan seasoning of 113 months and 95 months for Subprime Portfolios I and II, respectively, at December 31, 2014.
[2] The retained interests include retained bonds of the securitizations. Their fair value is estimated based on pricing models. Newcastle's residual interests were written off in 2010. The weighted average yield of the retained note was 22.40% as of December 31, 2014.
[3] Audited.
[4] Average loan seasoning of 101 months and 83 months for Subprime Portfolios I and II, respectively, at December 31, 2013.