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Earnings per common share - Narrative (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2020	Jun. 30, 2019
Restricted share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares			6,864
Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Antidilutive securities excluded from computation of earnings per share, shares		1,704,691
Performance-vesting restricted share units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation, shares issued in period	100,958
Share-based compensation, shares vested in period	27,456
Share-based compensation, shares granted in period		63,591	63,591	165,287
Number of restricted share units and common shares that are not vested, shares	103,820		103,820