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Employee benefit plans - Additional Information (Details) - 2017 Plan - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 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 | $ 177 | $ 186 | $ 266 | $ 191
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 | $ 1,304 |  | $ 1,304 |
Weighted average vesting period |  |  | 2 years 1 month 6 days |
Restricted stock units (RSUs) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |
Granted shares |  |  |  | 16,269

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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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