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Financial instruments (Details 19) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Disclosure of financial instruments [Line Items]    
Recorded investment $ 58,759 $ 65,364
Past due principal balance 35,000 53,364
Related allowance Stage 3 27,995 35,353
Average principal loan balance 40,988 30,205
Balance Interest recognized 3,257 2,087
Private corporations [Member]    
Disclosure of financial instruments [Line Items]    
Recorded investment 23,759 30,364
Past due principal balance 0 18,364
Related allowance Stage 3 7,468 23,174
Average principal loan balance 5,988 12,500
Balance Interest recognized 229 408
Middle-market companies [member]    
Disclosure of financial instruments [Line Items]    
Recorded investment 35,000 35,000
Past due principal balance 35,000 35,000
Related allowance Stage 3 20,527 12,179
Average principal loan balance 35,000 17,705
Balance Interest recognized $ 3,028 $ 1,679