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Short-term Borrowings (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Short-term borrowings    
Short-term borrowings $ 305,297 $ 728,250
FSC
    
Short-term borrowings    
Weighted average interest rate (as a percent) 1.09% 1.16%
Federal funds purchased
    
Short-term borrowings    
Short-term borrowings 91,875 269,625
Securities sold under agreements to repurchase
    
Short-term borrowings    
Short-term borrowings 121,222 85,725
Federal Home Loan Bank notes
    
Short-term borrowings    
Short-term borrowings   250,000
Average balance during the period 142,274  
Average interest rate during the period (as a percent) 0.13%  
Average interest rate at end of period (as a percent) 0.00% 0.07%
Federal Home Loan Bank notes | Maximum
    
Short-term borrowings    
Maturity term of debt 365 days  
Federal funds purchased and securities sold under agreements to repurchase
    
Short-term borrowings    
Average balance during the period 284,819  
Average interest rate during the period (as a percent) 0.19%  
Average interest rate at end of period (as a percent) 0.14% 0.22%
Carrying value 152,808 122,153
Estimated fair value 146,197 122,435
Short-term bank loans
    
Short-term borrowings    
Short-term borrowings $ 92,200 $ 122,900