Commitments and Contingencies (Narrative) (Details) $ in Thousands	1 Months Ended			12 Months Ended
	Jun. 30, 2015 USD ($)	Apr. 30, 2015 USD ($) office	Jan. 31, 2013 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($) group	Dec. 31, 2014 USD ($)
Operating Leased Assets [Line Items]
Term for rent holiday	4 months
Virginia Lease
Operating Leased Assets [Line Items]
Monthly rental payments included in agreement			$ 65
Term for rent holiday			6 years
Tenant incentive/allowance			$ 1,000
New York Lease
Operating Leased Assets [Line Items]
Monthly rental payments included in agreement				$ 500
Tenant incentive/allowance				5,800
Rent credits				3,800
Denver Lease
Operating Leased Assets [Line Items]
Number of offices that received notice of termination | office		1
Tenant improvement allowance		$ 400
New Denver Lease
Operating Leased Assets [Line Items]
Tenant incentive/allowance	$ 2,600
Average monthly fixed rent payment	$ 144
Data Warehouse Lease Through January 2017
Operating Leased Assets [Line Items]
Capital leases, future minimum payments due				$ 7,000	$ 4,300	$ 2,100
Gains (Losses) on Sale of Loans, Net | Customer Concentration Risk
Operating Leased Assets [Line Items]
Number of groups of customers | group					1
Percentage of total revenue, gain on sales of loans					13.00%