Residential Whole Loans - Fair Value (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) loan	Dec. 31, 2014 USD ($) loan
Residential Whole Loans [Abstract]
Outstanding principal balance	$ 786,330	$ 182,613
Aggregate fair value	$ 623,276	$ 143,472
Number of loans | loan	3,143	885