Description of Business (Narrative) (Details)	9 Months Ended
	Sep. 30, 2017 USD ($) loan program
Description Of Business [Abstract]
Number of business programs | program	2
Number of consumers required to group advances	100
Number of consumer loans assigned to receive accelerated Dealer Holdback payment	100
Servicing fee percentage in collections	20.00%
One-time enrollment fee in program | $	$ 9,850
Percentage of enrollment fee of first accelerated dealer holdback payment	50.00%