| FAIR VALUE - Recurring Basis (Details 2) (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013 | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | $ 310,639 | $ 984,263 | |||||||||||||||||
| Derivative Liabilities: | |||||||||||||||||||
| Derivative liabilities | 4,528 | 13,795 | |||||||||||||||||
| CMBS [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 206,085 | ||||||||||||||||||
| REIT Debt [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 30,293 | [1] | |||||||||||||||||
| Non-Agency RMBS [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 60,231 | [1] | |||||||||||||||||
| CDO Securities [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 13,721 | [1],[2] | |||||||||||||||||
| Equity Securities [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 309 | [1] | |||||||||||||||||
| Principal Balance or Notional Amount [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 386,557 | [3],[4] | |||||||||||||||||
| Derivative Liabilities: | |||||||||||||||||||
| Interest rate swaps, treated as hedges | 83,673 | [3],[5],[6] | |||||||||||||||||
| Interest rate swaps, not treated as hedges | 130,342 | [3],[5],[6] | |||||||||||||||||
| Carrying Value [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 310,639 | [3],[4] | |||||||||||||||||
| Derivative Liabilities: | |||||||||||||||||||
| Interest rate swaps, treated as hedges | 2,852 | [3],[5],[6] | |||||||||||||||||
| Interest rate swaps, not treated as hedges | 1,676 | [3],[5],[6] | |||||||||||||||||
| Estimated Fair Value [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 310,639 | [3],[4] | |||||||||||||||||
| Derivative Liabilities: | |||||||||||||||||||
| Interest rate swaps, treated as hedges | 2,852 | [3],[5],[6] | |||||||||||||||||
| Interest rate swaps, not treated as hedges | 1,676 | [3],[5],[6] | |||||||||||||||||
| Measured on a Recurring Basis [Member] | Level 2 Inputs [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 30,293 | ||||||||||||||||||
| Derivative Liabilities: | |||||||||||||||||||
| Interest rate swaps, treated as hedges | 2,852 | ||||||||||||||||||
| Interest rate swaps, not treated as hedges | 1,676 | ||||||||||||||||||
| Derivative liabilities | 4,528 | ||||||||||||||||||
| Measured on a Recurring Basis [Member] | Level 2 Inputs [Member] | REIT Debt [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 30,293 | [7] | |||||||||||||||||
| Measured on a Recurring Basis [Member] | Level 3 Inputs [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 280,346 | ||||||||||||||||||
| Measured on a Recurring Basis [Member] | Level 3 Inputs [Member] | CMBS [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 206,085 | ||||||||||||||||||
| Measured on a Recurring Basis [Member] | Level 3 Inputs [Member] | Non-Agency RMBS [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 60,231 | ||||||||||||||||||
| Measured on a Recurring Basis [Member] | Level 3 Inputs [Member] | CDO Securities [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 13,721 | [8] | |||||||||||||||||
| Measured on a Recurring Basis [Member] | Level 3 Inputs [Member] | Equity Securities [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 309 | ||||||||||||||||||
| Measured on a Recurring Basis [Member] | Principal Balance or Notional Amount [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 386,557 | ||||||||||||||||||
| Derivative Liabilities: | |||||||||||||||||||
| Interest rate swaps, treated as hedges | 83,673 | ||||||||||||||||||
| Interest rate swaps, not treated as hedges | 130,342 | ||||||||||||||||||
| Derivative liabilities | 214,015 | ||||||||||||||||||
| Measured on a Recurring Basis [Member] | Principal Balance or Notional Amount [Member] | CMBS [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 240,403 | ||||||||||||||||||
| Measured on a Recurring Basis [Member] | Principal Balance or Notional Amount [Member] | REIT Debt [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 29,200 | [7] | |||||||||||||||||
| Measured on a Recurring Basis [Member] | Principal Balance or Notional Amount [Member] | Non-Agency RMBS [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 87,113 | ||||||||||||||||||
| Measured on a Recurring Basis [Member] | Principal Balance or Notional Amount [Member] | ABS Franchise [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 8,464 | ||||||||||||||||||
| Measured on a Recurring Basis [Member] | Principal Balance or Notional Amount [Member] | CDO Securities [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 21,377 | [8] | |||||||||||||||||
| Measured on a Recurring Basis [Member] | Carrying Value [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 310,639 | ||||||||||||||||||
| Derivative Liabilities: | |||||||||||||||||||
| Interest rate swaps, treated as hedges | 2,852 | ||||||||||||||||||
| Interest rate swaps, not treated as hedges | 1,676 | ||||||||||||||||||
| Derivative liabilities | 4,528 | ||||||||||||||||||
| Measured on a Recurring Basis [Member] | Carrying Value [Member] | CMBS [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 206,085 | ||||||||||||||||||
| Measured on a Recurring Basis [Member] | Carrying Value [Member] | REIT Debt [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 30,293 | [7] | |||||||||||||||||
| Measured on a Recurring Basis [Member] | Carrying Value [Member] | Non-Agency RMBS [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 60,231 | ||||||||||||||||||
| Measured on a Recurring Basis [Member] | Carrying Value [Member] | CDO Securities [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 13,721 | [8] | |||||||||||||||||
| Measured on a Recurring Basis [Member] | Carrying Value [Member] | Equity Securities [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 309 | ||||||||||||||||||
| Measured on a Recurring Basis [Member] | Estimated Fair Value [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 310,639 | ||||||||||||||||||
| Derivative Liabilities: | |||||||||||||||||||
| Interest rate swaps, treated as hedges | 2,852 | ||||||||||||||||||
| Interest rate swaps, not treated as hedges | 1,676 | ||||||||||||||||||
| Derivative liabilities | 4,528 | ||||||||||||||||||
| Measured on a Recurring Basis [Member] | Estimated Fair Value [Member] | CMBS [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 206,085 | ||||||||||||||||||
| Measured on a Recurring Basis [Member] | Estimated Fair Value [Member] | REIT Debt [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 30,293 | [7] | |||||||||||||||||
| Measured on a Recurring Basis [Member] | Estimated Fair Value [Member] | Non-Agency RMBS [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 60,231 | ||||||||||||||||||
| Measured on a Recurring Basis [Member] | Estimated Fair Value [Member] | CDO Securities [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | 13,721 | [8] | |||||||||||||||||
| Measured on a Recurring Basis [Member] | Estimated Fair Value [Member] | Equity Securities [Member] | |||||||||||||||||||
| Assets: | |||||||||||||||||||
| Real estate securities, available-for-sale | $ 309 | ||||||||||||||||||
| 
 | |||||||||||||||||||