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Basic and Diluted Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2012
Basic and Diluted Earnings Per Share  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
     Year ended December 31
(Dollars in thousands, except share and per share data)  2012  2011  2010
Basic and diluted:         
Net earnings $6,763 $5,538 $5,346
Weighted average common shares outstanding  3,642,831  3,642,735  3,642,851
 Earnings per share $1.86 $1.52 $1.47