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Management of financial risk - Valuation inputs and relationships to fair value for loans and advances to customers (Details) - Loans and advances to customers from virtual bank - Level 3
Dec. 31, 2022
Dec. 31, 2021
Discount rate    
Valuation inputs and relationships to fair value liabilities    
Range of inputs, minimum 5.66% 5.22%
Range of inputs, maximum 9.30% 10.05%
Prepayment ratio    
Valuation inputs and relationships to fair value liabilities    
Range of inputs, minimum 0.34% 0.35%
Range of inputs, maximum 0.38% 0.39%