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Comprehensive Income (Tables)
 6 Months Ended
Jun. 30, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]

The following table represents the reclassification out of accumulated other comprehensive (loss) income for the periods presented:

Details about Accumulated Other   Amounts Reclassified from Accumulated Affected Line item in the
Comprehensive Income Components   Other Comprehensive Income Statement Where Net Income is Presented
  Three Months Ended Six Months Ended
  June 30, June 30,
  2018    2017    2018    2017   
    (dollars in thousands)  
Sale of investment securities available for sale   $       - $       - $       - $       1,596 Net gains on sale of securities available-for-sale
  - - - (579 ) Income tax expense
  - - - 1,017
 
Amortization of pension plan net actuarial losses   (91 ) (103 ) (182 ) (206 ) Salaries and employee benefits
  25 42 50 84 Income tax benefit
  (66 ) (61 ) (132 ) (122 )
                                     
Total reclassification   $ (66 ) $ (61 ) $ (132 ) $ 895
Comprehensive Income (Loss) [Table Text Block]

Accumulated other comprehensive loss at June 30, 2018 and December 31, 2017 consisted of the following:

June 30, December 31,
      2018       2017
(dollars in thousands)
Investment securities available-for-sale, net of tax $         (6,096 ) $          (902 )
Cash flow hedge, net of tax 1,361 472
Defined benefit pension and post-retirement plans, net of tax (3,912 ) (3,589 )
Total $ (8,647 ) $ (4,019 )