Quarterly report pursuant to Section 13 or 15(d)

Borrowings (Details)

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Borrowings (Details) (USD $)
In Thousands, unless otherwise specified
 9 Months Ended 12 Months Ended
Sep. 30, 2012
Dec. 31, 2011
Sep. 30, 2011
Short-term borrowings      
Securities sold under agreements to repurchase $ 94,616 $ 62,995 $ 70,450
Other short-term borrowings 59,500     
Total short-term borrowings 154,116 62,995  
Maximum month-end outstanding balance 154,116 78,622  
Average outstanding balance during the year 81,061 73,831  
Average interest rate during the year 0.93% 0.49%  
Average interest rate at end of year 0.31% 0.47%  
Other short-term borrowings:      
Federal Funds purchased 19,500    
FHLB $ 40,000 $ 40,000