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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% |

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- Definition Remaining renewal lease terms for operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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