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Long-term debt - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument    
Long-term debt at fixed rates $ 28,606  
Long-term debt at adjustable rates $ 9,300  
Interest rate description three-month Libor plus 1.21% to plus 1.57%  
FHLB long-term advances $ 0 $ 0
Minimum    
Debt Instrument    
Interest rate (as a percent) 1.21%  
Maximum    
Debt Instrument    
Interest rate (as a percent) 1.57%