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Share-based compensation - Disclosure of number and weighted average exercise prices of share options (Details)
 12 Months Ended
Dec. 31, 2022
shares
$ / shares
Dec. 31, 2021
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]    
Number of share options outstanding, beginning of period | shares 3,730,580 4,240,869
Weighted average exercise price share options, beginning of period | $ / shares $ 14.09 $ 14.22
Number of share options granted | shares 684,100 763,700
Weighted average exercise price of share options granted | $ / shares $ 14.25 $ 13.27
Number of share options exercised | shares (309,749) (1,043,903)
Weighted average exercise price of share options exercised | $ / shares $ 13.56 $ 13.75
Number of share options forfeited | shares (35,135) (58,866)
Weighted average exercise price of share options forfeited | $ / shares $ 13.48 $ 13.45
Number of share options expired | shares (557,874) (171,220)
Weighted average exercise price of share options expired | $ / shares $ 18.02 $ 16.04
Number of share options outstanding, end of period | shares 3,511,922 3,730,580
Weighted average exercise price share options, end of period | $ / shares $ 13.55 $ 14.09
Number of share options exercisable | shares 1,916,888 1,881,416
Weighted average exercise price of share options exercisable | $ / shares $ 13.4 $ 14.78