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Commitment and Contigent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule Of Commitments To Extend Credit [Table Text Block]
December 31
(Dollars in thousands)20172016
Commitments to extend credit$57,014$45,979
Standby letters of credit7,3907,432