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Financial instruments (Details 27) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of financial instruments [Line Items]      
Interest expenses - borrowings and debt $ 63,417 $ 70,558 $ 63,045
Fair value hedges [member]      
Disclosure of financial instruments [Line Items]      
Gain (loss) on derivatives 14,281 19,335 (15,909)
Gain (loss) on hedge item (37,758) (44,474) 276
Net gain (loss) (23,477) (25,139) (15,633)
Interest rate swap contract [member]      
Disclosure of financial instruments [Line Items]      
Interest income - securities at FVOCI 350 976 467
Interest income loans at amortized cost 148 1,998 3,611
Interest expenses - borrowings and debt (14,846) (23,703) (17,758)
Derivative financial instruments and hedging 101 101 (153)
Interest rate swap contract [member] | Fair value hedges [member]      
Disclosure of financial instruments [Line Items]      
Interest income - securities at FVOCI 476 1,593 1,514
Interest income loans at amortized cost 160 2,023 3,987
Interest expenses - borrowings and debt (16,233) (28,261) (24,026)
Derivative financial instruments and hedging 2,371 2,178 1,688
Interest rate swap contract [member] | Gainloss on hedge item [Member]      
Disclosure of financial instruments [Line Items]      
Interest income - securities at FVOCI (126) (617) (1,047)
Interest income loans at amortized cost (12) (25) (376)
Interest expenses - borrowings and debt 1,387 4,558 6,268
Derivative financial instruments and hedging (2,270) (2,077) (1,841)
Cross-currency interest rate swaps [Member]      
Disclosure of financial instruments [Line Items]      
Interest income loans at amortized cost 946 556 213
Interest expenses - borrowings and debt (8,417) (5,988) (3,041)
Derivative financial instruments and hedging (1,759) 921 1,028
Cross-currency interest rate swaps [Member] | Fair value hedges [member]      
Disclosure of financial instruments [Line Items]      
Interest income loans at amortized cost 2,442 928 348
Interest expenses - borrowings and debt (10,265) (6,183) (3,785)
Derivative financial instruments and hedging (16,709) (16,752) 20,550
Cross-currency interest rate swaps [Member] | Gainloss on hedge item [Member]      
Disclosure of financial instruments [Line Items]      
Interest income loans at amortized cost (1,496) (372) (135)
Interest expenses - borrowings and debt 1,848 195 744
Derivative financial instruments and hedging $ 14,950 $ 17,673 $ (19,522)