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Other comprehensive income (loss) - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Equity [Abstract]    
Net unrealized gain on investment securities available-for-sale $ 5,447 $ 6,292
Income tax expense (benefit) 1,906 2,202
Net of income taxes 3,541 4,090
Benefit plan adjustments (7,567) (7,567)
Income tax expense (benefit) (2,648) (2,648)
Net of income taxes (4,919) (4,919)
Accumulated other comprehensive loss $ (1,378) $ (829)