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Operating lease commitments and contingencies (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
item
Dec. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
Operating leases      
Options to renew true    
Renewal term 5 years    
Weighted average remaining lease term 17 years 1 month 6 days 16 years  
Right-of-use assets $ 8,000 $ 8,600  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property, Plant and Equipment, Net Property, Plant and Equipment, Net  
Lease liabilities for operating leases $ 8,300 $ 8,800  
Operating Lease, Liability, Statement of Financial Position [Extensible List] Other Liabilities Other Liabilities  
Number of operating lease added | item 0 2  
Rent expense $ 1,000 $ 760  
Rent expense     $ 727
Minimum      
Operating leases      
Remaining renewal terms 7 years    
Discount rate 1.60%    
Weighted-average discount rate   3.00%  
Maximum      
Operating leases      
Remaining renewal terms 31 years    
Discount rate 3.85%    
Weighted-average discount rate   2.99%