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Financial instruments (Details 4) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of financial instruments [Line Items]      
Realized gain on sale of securities $ 766 $ 221 $ 469
Realized loss on sale of securities (517) (577) (106)
Net (loss) gain on sale of securities at fair value through other comprehensive income $ 249 $ (356) $ 363