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Fair value of financial instruments - Level 3 - (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Fair value of financial instruments [Line Items]    
Balance at the beginning $ 6,492 $ 0
Additions 7,183 8,750
Net changes in fair value (2,976) (2,258)
Sales (5,750) 0
Balance at the end 4,949 6,492
Loans    
Disclosure of Fair value of financial instruments [Line Items]    
Balance at the beginning 0  
Balance at the end 4,949 0
At fair value through profit or loss | Level 3    
Disclosure of Fair value of financial instruments [Line Items]    
Sales 5,800  
Balance at the end 4,900  
At fair value through profit or loss | Debt instruments    
Disclosure of Fair value of financial instruments [Line Items]    
Balance at the beginning 6,492 0
Additions 1,433 8,750
Net changes in fair value (2,175) (2,258)
Sales (5,750) 0
Balance at the end 0 6,492
At fair value through profit or loss | Loans    
Disclosure of Fair value of financial instruments [Line Items]    
Balance at the beginning 0 0
Additions 5,750 0
Net changes in fair value (801) 0
Sales 0 0
Balance at the end $ 4,949 $ 0