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Trading assets and liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Trading assets:    
Total trading assets $ 0 $ 5,265
Trading liabilities:    
Trading liabilities 72 32,304
Interest Rate Swap [Member]
   
Trading liabilities:    
Trading liabilities 65 100
Cross Currency Interest Rate Swaps [Member]
   
Trading liabilities:    
Trading liabilities 7 32,182
Forward Foreign Exchange [Member]
   
Trading assets:    
Total trading assets 0 50
Trading liabilities:    
Trading liabilities 0 22
Future [Member]
   
Trading assets:    
Total trading assets 0 20
Cross Currency Swaps [Member]
   
Trading assets:    
Total trading assets 0 49
Sovereign Bonds [Member]
   
Trading assets:    
Total trading assets $ 0 $ 5,146