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Derivative Instruments (Tables)
6 Months Ended
Jun. 30, 2018
Derivative instruments and hedging activities disclosure abstract  
Schedule of Derivative Instruments [Table Text Block]
OtherOther
AssetsLiabilities
EstimatedEstimated
(Dollars in thousands)NotionalFair ValueFair Value
December 31, 2017:
Pay fixed / receive variable$3,61752
Pay variable / receive fixed3,61752
Total interest rate swap agreements$7,2345252