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Management of financial risk - Financial assets measured at amortized cost from banking operations (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of credit risk exposure      
Financial assets measured at fair value through other-comprehensive income. ¥ 1,233,431 ¥ 482,497  
Total financial assets 6,810,333 7,102,545  
Loss allowance 59,852 82,340  
Financial assets measured at amortized cost, Gross carrying amount 44 13,385  
Gross carrying amount 122,628 228,763  
Expected credit loss provision   190  
Loans and advances to customers.      
Disclosure of credit risk exposure      
Loss allowance ¥ 11,528 ¥ 1,962 ¥ 712
Credit risk      
Disclosure of credit risk exposure      
Expected loss rate 9.90% 10.06%  
Credit risk | Loans and advances to customers.      
Disclosure of credit risk exposure      
Financial assets measured at amortized cost ¥ 44 ¥ 13,575  
Financial assets measured at fair value through other-comprehensive income. 1,608,402 1,103,460  
Gross carrying amount ¥ 1,608,446 1,117,035  
Expected credit loss provision   ¥ 190  
Expected loss rate   1.40%