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Management of financial risk - Valuation inputs and relationships to fair value with all other variables held constant (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Discount rate    
Valuation inputs and relationships to fair value liabilities    
Unobservable inputs, maximum 5.00% 5.00%
Unobservable inputs, minimum 5.00% 5.00%
Discount rate | Loans and advances to customers from virtual bank    
Valuation inputs and relationships to fair value liabilities    
Impact on the assets and other comprehensive income, decrease ¥ (5,941) ¥ (4,579)
Impact on the assets and other comprehensive income, increase ¥ 5,975 ¥ 4,608
Prepayment ratio    
Valuation inputs and relationships to fair value liabilities    
Unobservable inputs, maximum 5.00% 5.00%
Unobservable inputs, minimum 5.00% 5.00%
Prepayment ratio | Loans and advances to customers from virtual bank    
Valuation inputs and relationships to fair value liabilities    
Impact on the assets and other comprehensive income, decrease ¥ (283) ¥ (195)
Impact on the assets and other comprehensive income, increase ¥ 283 ¥ 195