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Leases (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Lease [Abstract]      
Right-of-use assets, beginning balance     $ 4,352
Modifications and renewals $ 33 $ 1,228  
Additions   121  
Disposals (333)    
Depreciation expense (642) (880)  
Right-of-use assets, ending balance 3,879 4,821  
Lease liabilities, beginning balance     $ 4,694
Modifications and renewals (100) 1,226  
Additions   121  
Disposals (328)    
Interest expense 272 345  
Payments (716) (1,178)  
Lease liabilities, ending balance $ 4,336 $ 5,208