Loans - Held and Held For Sale at FV (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017 USD ($) loan	Dec. 31, 2016 USD ($) loan
Loans
Number of loans held at fair value | loan	56	27
Aggregate outstanding principal balance - Held at fair value	$ 165,500	$ 79,100
Held at fair value - Carrying Value	$ 170,128	$ 81,592
Number of loans held for sale at fair value | loan	662	714
Aggregate outstanding principal balance - Held for Sale at fair value	$ 200,900	$ 178,900
Held for sale, at fair value - Carrying Value	$ 206,706	$ 181,797