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Share-based compensation - Schedule of restricted share award activity (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross	336,069	0	0
Non-Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock Issued During Period, Shares, Restricted Stock Award, Gross	67,291	50,644	36,418
Restricted share awards
Number of non-vested restricted shares (in shares)
Outstanding, beginning of year (in shares)	24,065	18,209	301,043
Granted (in shares)	403,360	50,644	36,418
Forfeited (in shares)	(36,907)		(71,429)
Vested (in shares)	(49,751)	(44,788)	(247,823)
Outstanding, end of year (in shares)	340,767	24,065	18,209
Weighted average grant data fair value (in dollars per share)
Outstanding, beginning of year (in dollars per share)	$ 13.35	$ 12.15	$ 11.12
Granted (in dollars per share)	11.10	13.45	12.15
Forfeited (in dollars per share)	11.31		14.00
Vested (in dollars per share)	12.40	12.97	10.36
Outstanding, end of year (in dollars per share)	$ 11.83	$ 13.35	$ 12.15

X

- Definition

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

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Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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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 weighted average fair value at grant date for nonvested equity-based awards issued 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 weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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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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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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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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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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