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Other comprehensive income (loss) - Components of Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Other comprehensive income (loss)    
Net unrealized gain on investment securities available-for-sale $ 5,346 $ 4,593
Income tax expense (benefit) 1,871 1,607
Net of income taxes 3,475 2,986
Benefit plan adjustments (7,863) (7,863)
Income tax expense (benefit) (2,752) (2,752)
Net of income taxes (5,111) (5,111)
Accumulated other comprehensive loss $ (1,636) $ (2,125)