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Stock plans - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
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	16,269	17,345
Vested shares	15,460	8,455	2,542
Number of nonvested restricted stock awards	36,281	31,923	25,984	12,892
Forfeited shares		1,875	1,711
Unrecognized compensation expense	$ 855
Weighted average vesting period	1 year 8 months 12 days
2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Common stock available for grant as awards	37,151
Forfeited shares	0	1,875
Salaries and employee benefits expense	$ 546	$ 570	$ 554
2017 Plan | Non-Performance-based restricted stock
Share-based Compensation Arrangement by Share-based Payment Award
Granted shares	4,403
Shares or units awarded		3,615
Number of nonvested restricted stock awards	3,128	1,920
2017 Plan | Performance-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award
Granted shares	15,415	12,654
Number of nonvested restricted stock awards	12,332	6,535

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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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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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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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