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Summary of significant accounting policies - Recent accounting standards (Details) - USD ($) $ in Thousands | Jan. 01, 2023 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | ---
Loans and leases |  |  |  |  |
Ending balance |  | $ 21,895 |  |  |
Off-balance sheet exposures |  | 43 | $ 179 | $ 137 | $ 122
Impact to retained earnings |  | 248,550 | 230,515 |  |
Stockholders' equity |  | 340,422 | 315,350 | $ 340,126 | $ 316,877
Commercial |  |  |  |  |
Loans and leases |  |  |  |  |
Ending balance |  | 2,272 |  |  |
Commercial real estate |  |  |  |  |
Loans and leases |  |  |  |  |
Ending balance |  | 14,153 |  |  |
Residential real estate |  |  |  |  |
Loans and leases |  |  |  |  |
Ending balance |  | 3,782 |  |  |
Consumer |  |  |  |  |
Loans and leases |  |  |  |  |
Ending balance |  | 900 |  |  |
Cumulative impact of adoption |  |  |  |  |
Loans and leases |  |  |  |  |
Off-balance sheet exposures |  | $ 270 |  |  |
Accounting Standards Update 2016-13 | Cumulative impact of adoption |  |  |  |  |
Error Corrections and Prior Period Adjustments Restatement |  |  |  |  |
Decreased of ACL related to loans offset to unfunded loan commitments | $ 3,300 |  |  |  |
Loans and leases |  |  |  |  |
Ending balance | $ 3,000 |  | 24,189 |  |
Stockholders' equity |  |  | 2,364 |  |
Accounting Standards Update 2016-13 | Cumulative impact of adoption | Commercial |  |  |  |  |
Loans and leases |  |  |  |  |
Ending balance |  |  | 2,682 |  |
Accounting Standards Update 2016-13 | Cumulative impact of adoption | Commercial real estate |  |  |  |  |
Loans and leases |  |  |  |  |
Ending balance |  |  | 14,571 |  |
Accounting Standards Update 2016-13 | Cumulative impact of adoption | Residential real estate |  |  |  |  |
Loans and leases |  |  |  |  |
Ending balance |  |  | 4,039 |  |
Accounting Standards Update 2016-13 | Cumulative impact of adoption | Consumer |  |  |  |  |
Loans and leases |  |  |  |  |
Ending balance |  |  | $ 903 |  |

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