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Employee benefit plans - Additional Information (Details) - 2017 Plan - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award
Common stock available for grant as awards	37,151		37,151
Salaries and employee benefits expense	$ 213	$ 192	$ 479	$ 383
Non-Performance-based restricted stock
Share-based Compensation Arrangement by Share-based Payment Award
Shares or units vesting period			3 years
Performance-based restricted stock units
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
Share-based Compensation Arrangement by Share-based Payment Award
Granted shares			19,818
Unrecognized compensation expense	$ 1,068		$ 1,068
Weighted average vesting period			1 year 9 months 18 days
Restricted stock units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award
Granted shares				16,269

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The average return on equity period used for conditions for vesting of performance-based restricted stock units.

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The cumulative diluted earnings per share period used for conditions for vesting of performance-based restricted stock units.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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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.

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Amount of cost (reversal of cost) for other postretirement benefits. Excludes pension benefits.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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