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Trading assets and liabilities (Detail 2) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount $ 14,600 $ 204,420
Asset, Fair Value 0 119
Liability, Fair Value 72 32,304
Interest Rate Swap [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 14,000 35,291
Asset, Fair Value 0 0
Liability, Fair Value 65 100
Cross Currency Interest Rate Swap [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 600 155,081
Asset, Fair Value 0 49
Liability, Fair Value 7 32,182
Forward Foreign Exchange [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 0 7,152
Asset, Fair Value 0 50
Liability, Fair Value 0 22
Future [Member]
   
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 0 6,896
Asset, Fair Value 0 20
Liability, Fair Value $ 0 $ 0