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Summary of significant accounting policies - Recent accounting standards (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Loans and leases |  |  |  |
Total loans and leases allowance | $ 27,472 | $ 28,383 | $ 27,344 | $ 22,677
Impact to retained earnings | 230,515 | 203,750 |  |
Commercial |  |  |  |
Loans and leases |  |  |  |
Total loans and leases allowance | 5,612 | 8,453 | 8,734 | 6,888
Commercial real estate |  |  |  |
Loans and leases |  |  |  |
Total loans and leases allowance | 17,915 | 15,928 | 14,559 | 11,496
Residential real estate |  |  |  |
Loans and leases |  |  |  |
Total loans and leases allowance | 3,072 | 3,209 | 3,129 | 3,226
Consumer |  |  |  |
Loans and leases |  |  |  |
Total loans and leases allowance | 873 | $ 793 | $ 922 | $ 1,067
Accounting Standards Update 2016-13 | Minimum |  |  |  |
Error Corrections and Prior Period Adjustments Restatement |  |  |  |
Decrease in management estimates | (2,500) |  |  |
Loans and leases |  |  |  |
Impact to retained earnings | 2,100 |  |  |
Accounting Standards Update 2016-13 | Maximum |  |  |  |
Error Corrections and Prior Period Adjustments Restatement |  |  |  |
Decrease in management estimates | (3,000) |  |  |
Loans and leases |  |  |  |
Impact to retained earnings | $ 2,500 |  |  |

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