Finance Receivables (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Unused lines of credit, wholesale	1,010,000,000	1,010,000,000
Consumer Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Approved but unfunded retail loans	168,700,000	149,800,000
Financing Receivable [Member] | Geographic Concentration Risk [Member] | Texas [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration Risk, Percentage	12.00%	12.00%