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Fair value of financial instruments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets $ 0 $ 5,265  
Total securities available-for-sale 334,368 183,017  
Investment funds 118,661 105,888  
Total derivative financial instruments used for hedging - receivable 15,217 [1] 19,239 [1] 4,159
Total assets at fair value 468,246 313,409  
Total trading liabilities 72 32,304  
Total derivative financial instruments used for hedging - payable 8,572 [1] 11,747 [1]  
Total liabilities at fair value 8,644 44,051  
Sovereign Debt [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets   5,146  
Total securities available-for-sale 156,200 165,631  
Cross Currency Interest Rate Contract [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets   49  
Total derivative financial instruments used for hedging - receivable 9,175 10,858  
Total trading liabilities 7 32,182  
Total derivative financial instruments used for hedging - payable 6,834 4,688  
Corporate Debt Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total securities available-for-sale 178,168 17,386  
Interest Rate Swap [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total derivative financial instruments used for hedging - receivable 5,018 8,319  
Total trading liabilities 65 100  
Total derivative financial instruments used for hedging - payable 1,646 6,600  
Foreign Exchange Forward [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets   50  
Total derivative financial instruments used for hedging - receivable 1,024 62  
Total trading liabilities   22  
Total derivative financial instruments used for hedging - payable 92 459  
Future [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets   20  
Fair Value, Inputs, Level 1 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets   5,215  
Total securities available-for-sale 334,368 182,741  
Investment funds 0 0  
Total derivative financial instruments used for hedging - receivable 0 0  
Total assets at fair value 334,368 187,956  
Total trading liabilities 0 0  
Total derivative financial instruments used for hedging - payable 0 0  
Total liabilities at fair value 0 0  
Fair Value, Inputs, Level 1 [Member] | Sovereign Debt [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets   5,146  
Total securities available-for-sale 156,200 165,355  
Fair Value, Inputs, Level 1 [Member] | Cross Currency Interest Rate Contract [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets   49  
Total derivative financial instruments used for hedging - receivable 0 0  
Total trading liabilities 0 0  
Total derivative financial instruments used for hedging - payable 0 0  
Fair Value, Inputs, Level 1 [Member] | Corporate Debt Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total securities available-for-sale 178,168 17,386  
Fair Value, Inputs, Level 1 [Member] | Interest Rate Swap [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total derivative financial instruments used for hedging - receivable 0 0  
Total trading liabilities 0 0  
Total derivative financial instruments used for hedging - payable 0 0  
Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Forward [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets   0  
Total derivative financial instruments used for hedging - receivable 0 0  
Total trading liabilities   0  
Total derivative financial instruments used for hedging - payable 0 0  
Fair Value, Inputs, Level 1 [Member] | Future [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets   20  
Fair Value, Inputs, Level 2 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets   50  
Total securities available-for-sale 0 276  
Investment funds 118,661 105,888  
Total derivative financial instruments used for hedging - receivable 15,217 19,239  
Total assets at fair value 133,878 125,453  
Total trading liabilities 72 32,304  
Total derivative financial instruments used for hedging - payable 8,572 11,747  
Total liabilities at fair value 8,644 44,051  
Fair Value, Inputs, Level 2 [Member] | Sovereign Debt [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets   0  
Total securities available-for-sale 0 276  
Fair Value, Inputs, Level 2 [Member] | Cross Currency Interest Rate Contract [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets   0  
Total derivative financial instruments used for hedging - receivable 9,175 10,858  
Total trading liabilities 7 32,182  
Total derivative financial instruments used for hedging - payable 6,834 4,688  
Fair Value, Inputs, Level 2 [Member] | Corporate Debt Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total securities available-for-sale 0 0  
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total derivative financial instruments used for hedging - receivable 5,018 8,319  
Total trading liabilities 65 100  
Total derivative financial instruments used for hedging - payable 1,646 6,600  
Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets   50  
Total derivative financial instruments used for hedging - receivable 1,024 62  
Total trading liabilities   22  
Total derivative financial instruments used for hedging - payable 92 459  
Fair Value, Inputs, Level 2 [Member] | Future [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets   0  
Fair Value, Inputs, Level 3 [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets   0  
Total securities available-for-sale 0 0  
Investment funds 0 0  
Total derivative financial instruments used for hedging - receivable 0 0  
Total assets at fair value 0 0  
Total trading liabilities 0 0  
Total derivative financial instruments used for hedging - payable 0 0  
Total liabilities at fair value 0 0  
Fair Value, Inputs, Level 3 [Member] | Sovereign Debt [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets   0  
Total securities available-for-sale 0 0  
Fair Value, Inputs, Level 3 [Member] | Cross Currency Interest Rate Contract [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets   0  
Total derivative financial instruments used for hedging - receivable 0 0  
Total trading liabilities 0 0  
Total derivative financial instruments used for hedging - payable 0 0  
Fair Value, Inputs, Level 3 [Member] | Corporate Debt Securities [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total securities available-for-sale 0 0  
Fair Value, Inputs, Level 3 [Member] | Interest Rate Swap [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total derivative financial instruments used for hedging - receivable 0 0  
Total trading liabilities 0 0  
Total derivative financial instruments used for hedging - payable 0 0  
Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Forward [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets   0  
Total derivative financial instruments used for hedging - receivable 0 0  
Total trading liabilities   0  
Total derivative financial instruments used for hedging - payable 0 0  
Fair Value, Inputs, Level 3 [Member] | Future [Member]
      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Total trading assets   $ 0  
[1] The fair value of assets and liabilities is reported within the derivative financial instruments used for hedging - receivable and payable lines in the consolidated balance sheets, respectively.