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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
Mar. 31, 2018
Dec. 31, 2017
Schedule of Available-for-sale Securities [Line Items]    
Less Than 12 Consecutive Months Amortized Cost $ 12,799 $ 8,637
Less Than 12 Consecutive Months Unrealized Losses (367) (132)
Less Than 12 Consecutive Months Fair Value 12,432 8,505
12 Consecutive Months or Longer Amortized Cost 27,186 28,557
12 Consecutive Months or Longer Unrealized Losses (955) (1,235)
12 Consecutive Months or Longer Fair Value $ 26,231 $ 27,322