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Income taxes - Disclosure of detailed information about income taxes (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Current income tax    
Expense for the year $ 1,231 $ 7,153
Current income tax expense 1,231 7,153
Deferred income tax:    
Origination and reversal of temporary differences (8,259) (1,062)
Impact of changes in tax rates 0 11
Change in unrecognized deductible temporary differences 20,050 6,570
Other (67) (1,759)
Deferred income tax expense 11,724 3,760
Income tax expense $ 12,955 $ 10,913