Description Of Business (Percentage Of Consumer Loans Assigned Based On Unit and Dollar Volumes) (Details)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Portfolio Program [Member]
Description Of Business [Line Items]
Percentage of new consumer loans in unit volume	78.60%	87.40%	90.70%
Percentage of new consumer loans in dollar volume	71.40%	82.80%	87.80%
Purchase Program [Member]
Description Of Business [Line Items]
Percentage of new consumer loans in unit volume	21.40%	12.60%	9.30%
Percentage of new consumer loans in dollar volume	28.60%	17.20%	12.20%