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Employee benefit plans - Salaries and Employee Benefits Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Employee Benefit Plans        
Defined Benefit Plan Disclosure        
Salaries and employee benefits expense $ 329 $ 173 $ 603 $ 452