Loan Receivables (Schedule of Credit Risk Profile by FICO Score) (Details)
Mar. 31, 2015
Dec. 31, 2014
Credit Card Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Credit risk profile by FICO score, 660 and above 83.00% 83.00%
Credit risk profile by FICO score, less than 660 or no score 17.00% 17.00%
Total Other Loans [Member] | Personal Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Credit risk profile by FICO score, 660 and above 96.00% 96.00%
Credit risk profile by FICO score, less than 660 or no score 4.00% 4.00%
Total Other Loans [Member] | Private Student Loans (Excluding PCI) [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Credit risk profile by FICO score, 660 and above 96.00% [1] 96.00% [1]
Credit risk profile by FICO score, less than 660 or no score 4.00% [1] 4.00% [1]
[1] PCI loans are discussed under the heading "— Purchased Credit-Impaired Loans."