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Employee benefit plans - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2024	Jun. 30, 2023
2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Salaries and employee benefits expense	$ 84	$ 167
2023 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Common stock available for grant as awards	66,298	66,298
Salaries and employee benefits expense	$ 200	$ 399
Non-Performance-based restricted stock | 2023 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares or units vesting period		3 years
Performance-based restricted stock units | 2023 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Granted shares		23,243	18,222
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
Time Based Restricted Stock [Member] | 2023 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Granted shares		8,895	5,206
Restricted Stock | 2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Unrecognized compensation expense	$ 1,800	$ 1,800
Weighted average vesting period		2 years

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