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19. Derivative financial instruments (Tables)
12 Months Ended
Dec. 31, 2013
Investments, All Other Investments [Abstract]  
Derivative financial instrument
  December 31, 2013
      Derivative   Net Ineffective
  Notional   Fair Value   Hedge Gains
Dollars in thousands Amount   Asset   Liability   (Losses)
CASH FLOW HEDGES              
Pay-fixed/receive-variable interest rate swaps            
      Long term borrowings $ 70,000   $ 803   $ -   $ -
  $ 70,000   $ 803   $ -   $ -