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Leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Lease cost      
Operating lease cost $ 1,616 $ 1,681  
Amortization of right-of-use asset 166    
Interest on lease liability 70    
Short-term lease cost 219 128  
Variable lease cost 52 43  
Total lease cost 2,123 1,852  
Lease expense recognized prior to the adoption of ASC 842     $ 1,680
Operating leases:      
Right-of-use assets $ 2,404 2,785  
Right-of-use assets, line item in Statement of Financial Position us-gaap:OtherAssets    
Lease liabilities $ 2,488 $ 2,813  
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilities us-gaap:OtherLiabilities  
Weighted average remaining lease term (years) 3 years 3 years  
Weighted average discount rate 2.20% 3.20%  
Finance leases:      
Right of use assets $ 6,193    
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Other assets.    
Lease liabilities $ 6,305    
Finance Lease, Liability, Statement of Financial Position [Extensible List] Secured Debt    
Weighted average remaining lease term (years) 19 years 6 months    
Weighted average discount rate 2.00%    
Right-of-use assets obtained in exchange for lease liabilities $ 1,110 $ 1,140  
Right of use assets obtained in exchange for lease liabilities under finance leases 6,360    
Operating cash flows 1,659 1,567  
Operating cash flows 70    
Finance cash flows 53    
Total cash flows $ 1,782 $ 1,567