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Derivative financial instruments for hedging purposes (Details 2) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) on derivatives $ 3,479 $ 11,461 $ (5,093)
Fair Value Hedging [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) on derivatives (3,994) 12,311 (17,042)
Gain (loss) on hedged item (11,559) (24,380) 19,922
Net gain (loss) (15,553) (12,069) 2,880
Fair Value Hedging [Member] | Interest Rate Swap [Member] | Interest Income [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) on derivatives (39)    
Gain (loss) on hedged item 350    
Net gain (loss) 311    
Fair Value Hedging [Member] | Interest Rate Swap [Member] | Interest Expense [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) on derivatives 3,192 1,564 0
Gain (loss) on hedged item (16,204) (12,022) 0
Net gain (loss) (13,012) (10,458) 0
Fair Value Hedging [Member] | Interest Rate Swap [Member] | Interest Income Available For Sale [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) on derivatives (3,088) (2,982) (6,857)
Gain (loss) on hedged item 4,649 4,776 10,266
Net gain (loss) 1,561 1,794 3,409
Fair Value Hedging [Member] | Interest Rate Swap [Member] | Derivative Financial Instruments and Hedging [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) on derivatives (3,622) 59 74
Gain (loss) on hedged item 3,942 0 0
Net gain (loss) 320 59 74
Fair Value Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Interest Income [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) on derivatives (795) (239) (33)
Gain (loss) on hedged item 1,548 522 55
Net gain (loss) 753 283 22
Fair Value Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Interest Expense [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) on derivatives 6,905 8,024 4,352
Gain (loss) on hedged item (12,452) (11,187) (7,874)
Net gain (loss) (5,547) (3,163) (3,522)
Fair Value Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Foreign Currency Gain (Loss) [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) on derivatives (430) 5,873 (17,427)
Gain (loss) on hedged item 458 (6,469) 17,475
Net gain (loss) 28 (596) 48
Fair Value Hedging [Member] | Cross Currency Interest Rate Contract [Member] | Derivative Financial Instruments and Hedging [Member]
      
Derivative Instruments and Hedging Activities Disclosures [Line Items]      
Gain (loss) on derivatives (6,117) 12 2,849
Gain (loss) on hedged item 6,150 0 0
Net gain (loss) $ 33 $ 12 $ 2,849