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

No definition available.

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

+ References

No definition available.

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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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No definition available.

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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 equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

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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 number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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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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Number of shares issued under share-based payment arrangement.

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Stock plans - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Granted shares	23,428	19,787	19,818
Vested shares	16,791	16,403	15,460
Number of nonvested restricted stock awards	58,631	39,470	36,281	31,923
Forfeited shares		195
Salaries and employee benefits expense	$ 0.9	$ 0.5	$ 0.5
2017 Plan \| Non-Performance-based restricted stock
Share-based Compensation Arrangement by Share-based Payment Award
Shares or units awarded		4,397
Number of nonvested restricted stock awards	4,139	3,846
Shares or units vesting period	3 years	3 years	3 years
2017 Plan \| Performance-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award
Granted shares		15,390
Number of nonvested restricted stock awards	12,652	12,557
Shares or units vesting period	3 years	3 years	3 years
Cumulative diluted earnings per share period used for conditions for vesting of performance-based restricted stock units	3 years	3 years	3 years
Average return on equity period used for conditions for vesting of performance-based restricted stock units	3 years	3 years	3 years
2017 Plan \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award
Unrecognized compensation expense	$ 1.2
Weighted average vesting period	1 year 8 months 12 days
2023 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Common stock available for grant as awards	98,403
Salaries and employee benefits expense	$ 0.9	$ 0.5	$ 0.5
2023 Plan \| Non-Performance-based restricted stock
Share-based Compensation Arrangement by Share-based Payment Award
Granted shares	5,206
2023 Plan \| Performance-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award
Granted shares	18,222