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Employee benefit plans - Additional Information (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Shares or units awarded |  |  | 2,548,000 | 2,362,000 |
Unrecognized compensation expense | $ 103 | $ 53 | $ 103 | $ 53 |
Employee Benefit Plans |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Salaries and employee benefits expense | 330 | 311 | 1,073 | 982 |
2008 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Salaries and employee benefits expense | $ 31 | 41 | $ 93 | 89 |
2017 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Salaries and employee benefits expense |  | $ 52 |  | $ 95 |
Common stock available for grant as awards | 86,994 |  | 86,994 |  |
Non-Performance-based restricted stock | 2008 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Shares or units awarded |  |  |  |  | 2,020
Number of nonvested restricted stock awards |  |  |  |  | 14,382
Shares or units vesting period |  |  |  |  | 3 years
Non-Performance-based restricted stock | 2017 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Shares or units awarded |  |  | 2,548 |  | 342
Number of nonvested restricted stock awards | 2,890 |  | 2,890 |  |
Performance-based restricted stock units | 2008 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Number of nonvested restricted stock awards |  |  |  |  | 7,071
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
Performance-based restricted stock units | 2017 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Shares or units awarded |  |  | 8,920 |  | 1,196
Restricted Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Weighted average vesting period |  |  | 2 years |  |
Restricted Stock | 2008 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Shares or units vesting period |  |  |  |  | 5 years
Unrecognized compensation expense | $ 609 |  | $ 609 |  |

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- Definition The cumulative diluted earnings per share period used for conditions for vesting of performance-based restricted stock units. + References No definition available. + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + 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=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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=109197908&loc=d3e5070-113901 + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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=109197908&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation 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 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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