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Long-term debt - Schedule of Long-term Debt Consisting of Advances (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Long-term debt $ 58,134 $ 60,354
November 2015    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 4.86%  
Long-term debt   23
February 2016    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 4.86%  
Long-term debt   23
February 2016    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 4.99%  
Long-term debt $ 77 510
February 2017    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 2.36%  
Long-term debt $ 6,500 6,500
September 2017    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 3.83%  
Long-term debt $ 156 269
April 2018    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 1.27%  
Long-term debt $ 10,000 10,000
December 2019    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 2.51%  
Long-term debt $ 3,000 3,000
December 2019    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 2.20%  
Long-term debt $ 6,300 6,300
December 2019    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 1.62%  
Long-term debt $ 10,000 10,000
June 2020    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 1.74%  
Long-term debt $ 5,000 5,000
December 2020    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 1.84%  
Long-term debt $ 5,000 5,000
March 2023    
Debt Instrument [Line Items]    
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate 4.69%  
Long-term debt $ 12,101 $ 13,729