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Basic and Diluted Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2018
Basic and Diluted Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]
Year ended December 31
(Dollars in thousands, except share and per share data)20182017
Basic and diluted:
Net earnings$8,834$7,846
Weighted average common shares outstanding3,643,7803,643,616
Net earnings per share$2.42$2.15