Receivables (Activity Related To Allowance For Credit Losses) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Allowance for Loan and Lease Losses
Allowance for credit losses, beginning balance	$ 1,270	$ 1,458
Change in loan loss provision based on historical data	(17)	(188)
Change in loan loss provision for impaired loans	1,525
Allowance for credit losses, ending balance	2,778	1,270
SFS
Allowance for Loan and Lease Losses
Allowance for credit losses, beginning balance	1,270	1,458
Change in loan loss provision based on historical data	(17)	(188)
Change in loan loss provision for impaired loans	0
Allowance for credit losses, ending balance	1,253	1,270
Agency
Allowance for Loan and Lease Losses
Allowance for credit losses, beginning balance	0	0
Change in loan loss provision based on historical data	0	0
Change in loan loss provision for impaired loans	1,525
Allowance for credit losses, ending balance	$ 1,525	$ 0