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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, 2013 
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           Dec. 31, 2012 
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|---|---|---|---|---|---|---|---|
| Total securitized loans (unpaid principal balance) | $ 879,281 | [1] | |||||
| Subprime mortgage loans subject to call option | 406,217 | 405,814 | |||||
| Retained interests (fair value) | 2,485 | [2] | |||||
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           Subprime Portfolio I 
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| Total securitized loans (unpaid principal balance) | 372,661 | [1] | |||||
| Subprime mortgage loans subject to call option | 299,176 | ||||||
| Retained interests (fair value) | 2,485 | [2] | |||||
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           Subprime Portfolio II 
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| Total securitized loans (unpaid principal balance) | 506,620 | [1] | |||||
| Subprime mortgage loans subject to call option | 107,041 | ||||||
| Retained interests (fair value) | [2] | ||||||
          
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- Definition 
          Reflects the aggregate carrying amount of subprime mortgage loans subject to call option. No definition available. 
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- Definition 
          This is the sum of principal amount outstanding for both securitized and unsecuritized loans of all types. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Definition 
          Fair value portion of interest continued to be held by a transferor after transferring financial assets to a third party. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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