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Derivative Instruments (Tables)
6 Months Ended
Jun. 30, 2015
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, 2015:
Pay fixed / receive variable$4,492552
Pay variable / receive fixed4,492552
Total interest rate swap agreements$8,984552552
December 31, 2014:
Pay fixed / receive variable$4,667634
Pay variable / receive fixed4,667634
Total interest rate swap agreements$9,334634634