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Trading assets and liabilities (Details 1) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative Instruments, Gain (Loss) [Line Items]      
Total $ 3,479 $ 11,461 $ (5,093)
Interest Rate Swap [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Total (9) (310) (299)
Cross Currency Swaps [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Total 67 0 0
Cross Currency Interest Rate Swap [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Total 3,236 11,537 (4,858)
Forward Foreign Exchange [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Total (6) 27 93
Future [Member]
      
Derivative Instruments, Gain (Loss) [Line Items]      
Total $ 191 $ 207 $ (29)