Certain Transfers of Financial Assets Certain Transfers of Financial Assets (Details 9) (Indirect automobile loan servicing rights, USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Servicing Assets at Fair Value [Line Items]  
Unpaid Principal Balance $ 2,297,055
Delinquent 30 to 80 4,401
Delinquent 90 Plus 1,939
Net Charge-offs for the Year Ended December 31, 2014 4,901
Loan Servicing Portfolio
 
Servicing Assets at Fair Value [Line Items]  
Unpaid Principal Balance 902,823
Delinquent 30 to 80 1,729
Delinquent 90 Plus 889
Net Charge-offs for the Year Ended December 31, 2014 2,020
Held-for-sale
 
Servicing Assets at Fair Value [Line Items]  
Unpaid Principal Balance 175,000
Delinquent 30 to 80 0
Delinquent 90 Plus 0
Net Charge-offs for the Year Ended December 31, 2014 0
Held-for-investment
 
Servicing Assets at Fair Value [Line Items]  
Unpaid Principal Balance 1,219,232
Delinquent 30 to 80 2,672
Delinquent 90 Plus 1,050
Net Charge-offs for the Year Ended December 31, 2014 $ 2,881