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Operating lease commitments and contingencies (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
item
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Operating leases      
Options to renew true    
Renewal term 5 years    
Weighted average remaining lease term 16 years 13 years  
Weighted-average discount rate 2.99% 3.19%  
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 $ 8,790    
Operating Lease, Liability, Statement of Financial Position [Extensible List] Other Liabilities Other Liabilities  
Lease payments $ 644    
Lease expense $ 278    
Number of operating lease added | item 2    
Rent expense $ 760 $ 727  
Rent expense     $ 670
Premises and Equipment      
Operating leases      
Right-of-use assets 8,563 6,282  
Other Liabilities.      
Operating leases      
Lease liabilities for operating leases 8,790 6,425  
Additional Lease Property      
Operating leases      
Lease liabilities for operating leases   $ 899  
Number of operating lease added | item   1  
Newly constructed facility for Binghamton branch and newest branch in Piscataway, New Jersey      
Operating leases      
Lease liabilities for operating leases $ 2,731    
Number of operating lease added | item 2    
Newly constructed facility for Binghamton branch      
Operating leases      
Number of operating lease added | item 1    
Newest branch in Piscataway, New Jersey      
Operating leases      
Number of operating lease added | item 1    
Minimum      
Operating leases      
Remaining renewal terms 7 years    
Discount rate 1.60% 1.95%  
Maximum      
Operating leases      
Remaining renewal terms 31 years    
Discount rate 3.85% 3.85%