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Real Estate Securities - Components of Carrying Value of Residential Available for Sale Securities in Unrealized Loss Position (Details) - Residential - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Consecutive Months Amortized Cost $ 15,772 $ 87,718
Less Than 12 Consecutive Months Gross Unrealized Losses (330) (1,972)
Less Than 12 Consecutive Months Fair Value 15,442 85,746
12 Consecutive Months or Longer Amortized Cost 60,035 77,539
12 Consecutive Months or Longer Gross Unrealized Losses (2,839) (3,035)
12 Consecutive Months or Longer Fair Value $ 57,196 $ 74,504