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Guarantees, commitments and risks - Sensitivity USD (Details) - Strategic liquidity risk - US Dollars - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Guarantees, commitments and risks    
Value at risk $ 50 $ 50
Minimum    
Guarantees, commitments and risks    
Value at risk 30 20
Maximum    
Guarantees, commitments and risks    
Value at risk 70 50
Average    
Guarantees, commitments and risks    
Value at risk $ 50 $ 40