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Employee benefit plans - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
2017 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Common stock available for grant as awards | 17,364 |  | 17,364 |
Salaries and employee benefits expense | $ 158 | $ 191 | $ 316 | $ 390
2023 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Common stock available for grant as awards | 96,572 |  | 96,572 |
Non-Performance-based restricted stock | 2017 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Shares or units vesting period |  |  | 3 years |
Performance-based restricted stock units | 2017 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Shares or units vesting period |  |  | 3 years |
Cumulative diluted earnings per share period used for conditions for vesting of performance-based restricted stock units |  |  | 3 years |
Average return on equity period used for conditions for vesting of performance-based restricted stock units |  |  | 3 years |
Restricted Stock | 2017 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Unrecognized compensation expense | $ 1,700 |  | $ 1,700 |
Weighted average vesting period |  |  | 2 years |
Restricted stock and restricted stock units in aggregate | 2017 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Granted shares |  |  |  | 19,787
Restricted stock and restricted stock units in aggregate | 2023 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Granted shares |  |  | 23,428 |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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