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Operating lease commitments and contingencies (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Options to renew true    
Renewal term 5 years    
Weighted-average discount rate 3.46%    
Right-of-use assets $ 6,125    
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property, Plant and Equipment, Net    
Lease liabilities for operating leases $ 6,194    
Operating Lease, Liability, Statement of Financial Position [Extensible List] Other Liabilities    
Lease payments $ 578    
Lease expense 249    
Rent expense $ 601    
Rent expense   $ 492 $ 407
Minimum      
Remaining renewal term 3 years    
Discount rate 2.89%    
Maximum      
Remaining renewal term 22 years    
Discount rate 3.85%