Investment Securities, at Fair Value - Scheduled Maturity of CMBS (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value
Total	$ 42,250	$ 47,215
CMBS [Member]
Amortized Cost
Due within one year	0
Due after one year through five years	18,057
Due after five years through 10 years	11,977
Due after 10 years	13,561
Amortized Cost	43,595	48,297
Fair Value
Due within one year	0
Due after one year through five years	18,711
Due after five years through 10 years	9,498
Due after 10 years	14,041
Total	$ 42,250	$ 47,215