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Stock plans - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
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 | 16,269 | 17,345 | 11,468 |
Vested shares | 8,455 | 2,542 | 114 |
Number of nonvested restricted stock awards | 31,923 | 25,984 | 12,892 | 1,538
Forfeited shares | 1,875 | 1,711 |  |
Unrecognized compensation expense | $ 586 |  |  |
Weighted average vesting period | 1 year 10 months 25 days |  |  |
2008 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Number of nonvested restricted stock awards | 0 |  |  |
Forfeited shares |  | 1,327 |  |
Salaries and employee benefits expense |  | $ 122 | $ 123 |
2008 Plan | Non-Performance-based restricted stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Vested shares | 673 | 674 |  |
2008 Plan | Performance-based restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Vested shares |  | 5,743 |  |
2017 Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Common stock available for grant as awards | 56,966 |  |  |
Forfeited shares | 1,875 | 1,711 |  |
Salaries and employee benefits expense | $ 570 | $ 432 | $ 149 |
2017 Plan | Non-Performance-based restricted stock |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Granted shares | 3,615 |  |  |
Shares or units awarded |  | 3,855 |  |
Number of nonvested restricted stock awards | 1,920 | 1,614 |  |
2017 Plan | Performance-based restricted stock units |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Granted shares | 12,654 | 13,490 |  |
Number of nonvested restricted stock awards | 6,535 | 928 |  |

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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