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Derivative Instruments (Tables)
6 Months Ended
Jun. 30, 2016
Derivative instruments and hedging activities disclosure abstract  
Schedule of Derivative Instruments [Table Text Block]
OtherOther
AssetsLiabilities
EstimatedEstimated
(Dollars in thousands)NotionalFair ValueFair Value
June 30, 2016:
Pay fixed / receive variable$4,142375
Pay variable / receive fixed4,142375
Total interest rate swap agreements$8,284375375
December 31, 2015:
Pay fixed / receive variable$4,317440
Pay variable / receive fixed4,317440
Total interest rate swap agreements$8,634440440