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Borrowings (Tables)
 12 Months Ended
Dec. 31, 2012
Borrowings [Abstract]  
Securities sold under agreements to repurchase and federal funds purchased
Securities sold under agreements to repurchase are financing arrangements that mature within one year. At maturity, the securities underlying the agreements are returned to the Company. Information concerning securities sold under agreements to repurchase and federal funds purchased is summarized as follows:
 
 
 
2012
 
 
2011
 
 
2010
 
 
 
 
 
 
 
 
Average daily balance during the year
 
$
18,172
 
 
$
24,144
 
 
$
40,217
 
Average interest rate during the year
 
 
0.05
%
 
 
0.30
%
 
 
0.66
%
Maximum month end balance during the year
 
$
21,494
 
 
$
29,586
 
 
$
46,044
 
Weighted average interest rate at year-end
 
 
0.02
%
 
 
0.17
%
 
 
0.44
%