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Employee benefit plans - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		21 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019
Employee Benefit Plans
Share-based Compensation Arrangement by Share-based Payment Award
Salaries and employee benefits expense	$ 327	$ 330	$ 1,081	$ 1,073
2008 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Salaries and employee benefits expense		31		93
2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Salaries and employee benefits expense	$ 157	$ 52	$ 397	$ 95
Common stock available for grant as awards	61,346		61,346		61,346
Non-Performance-based restricted stock | 2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares or units vesting period			3 years	3 years
Performance-based restricted stock units | 2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Shares or units vesting period			3 years	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	3 years
Restricted Stock | 2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Granted shares			17,345
Unrecognized compensation expense	$ 938		$ 938		$ 938
Weighted average vesting period			1 year 4 months 24 days
Restricted stock units (RSUs) | 2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award
Granted shares				11,468

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- Definition

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

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The cumulative diluted earnings per share 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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-Publisher FASB
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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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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 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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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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