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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, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Consecutive Months Amortized Cost $ 8,637 $ 15,772
Less Than 12 Consecutive Months Unrealized Losses (132) (330)
Less Than 12 Consecutive Months Fair Value 8,505 15,442
12 Consecutive Months or Longer Amortized Cost 28,557 60,035
12 Consecutive Months or Longer Unrealized Losses (1,235) (2,839)
12 Consecutive Months or Longer Fair Value $ 27,322 $ 57,196