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Long-term debt - Schedule of Long-term Debt Consisting of Advances (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument    
Long-term debt $ 49,734 $ 58,134
February 2017    
Debt Instrument    
Fixed interest rate (as a percent) 4.99%  
Long-term debt   77
September 2017    
Debt Instrument    
Fixed interest rate (as a percent) 2.36%  
Long-term debt   6,500
April 2018    
Debt Instrument    
Fixed interest rate (as a percent) 3.83%  
Long-term debt $ 40 156
December 2018    
Debt Instrument    
Fixed interest rate (as a percent) 1.27%  
Long-term debt $ 10,000 10,000
December 2019    
Debt Instrument    
Adjustable interest rate (as a percent) 3.04%  
Long-term debt $ 3,000 3,000
December 2019    
Debt Instrument    
Adjustable interest rate (as a percent) 2.82%  
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
June 2020    
Debt Instrument    
Fixed interest rate (as a percent) 1.74%  
Long-term debt $ 5,000 5,000
December 2020    
Debt Instrument    
Fixed interest rate (as a percent) 1.84%  
Long-term debt $ 5,000 5,000
March 2023    
Debt Instrument    
Fixed interest rate (as a percent) 4.69%  
Long-term debt $ 10,394 $ 12,101