Allowance for loan losses (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Classified assets $ 10,454 $ 15,375 $ 30,684
Nonaccrual loans 2,402 3,718 7,478
Foreclosed real estate $ 2,926 $ 6,249 $ 12,638