Investment Securities, at Fair Value (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016 USD ($) security	Dec. 31, 2015 USD ($) security
Schedule of Available-for-sale Securities [Line Items]
Investment securities, at fair value | $	$ 48,162	$ 53,304
CMBS [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of securities owned | security	9	10
Investment securities, at fair value | $	$ 48,162	$ 53,304
Number of securities paid in full prior to maturity | security	1
Carrying value of security paid in full prior to maturity (less than) | $	$ 100
Number of securities with fair value below amortized cost | security	5
CMBS [Member] | Minimum [Member]
Schedule of Available-for-sale Securities [Line Items]
Interest rate	5.88%
CMBS [Member] | Maximum [Member]
Schedule of Available-for-sale Securities [Line Items]
Interest rate	8.95%