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Short-Term Borrowings (Tables)
9 Months Ended
Sep. 30, 2011
Short-Term Borrowings 
Schedule Of Short-Term Borrowings And Weighted-Average Interest Rates
                Other        
    Federal Funds     Repurchase     Short-term        
(dollars in thousands)   Purchased     Agreements     Borrowings     Total  
2011                        
Outstanding at September 30, 2011 $ 948   $ 328,720   $ 11,336   $ 341,004  
Average amount outstanding   1,580     335,078     8,988     345,646  
Maximum amount outstanding at                        
any month-end   17,178     366,103     11,336        
Weighted average interest rate:                        
During nine months ended                        
September 30, 2011   0.03 %   0.15 %   0.14 %   0.15 %
At September 30, 2011   0     0.15     0     0.15