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Long-term debt - Schedule of Long-term Debt Consisting of Advances (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument    
Long-term debt $ 37,906 $ 49,734
February 2017    
Debt Instrument    
Fixed interest rate (as a percent) 3.83%  
Long-term debt   $ 40
September 2017    
Debt Instrument    
Fixed interest rate (as a percent)   1.27%
Long-term debt   $ 10,000
April 2018    
Debt Instrument    
Adjustable interest rate (as a percent) 4.28%  
Long-term debt $ 3,000 3,000
December 2018    
Debt Instrument    
Adjustable interest rate (as a percent) 4.01%  
Long-term debt $ 6,300 6,300
December 2019    
Debt Instrument    
Fixed interest rate (as a percent) 1.62%  
Long-term debt $ 10,000 10,000
December 2019    
Debt Instrument    
Fixed interest rate (as a percent) 1.74%  
Long-term debt $ 5,000 5,000
December 2019    
Debt Instrument    
Fixed interest rate (as a percent) 1.84%  
Long-term debt $ 5,000 5,000
June 2020    
Debt Instrument    
Fixed interest rate (as a percent) 4.69%  
Long-term debt $ 8,606 $ 10,394