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Other investments - Asset management scheme (Details) - CNY (¥)
¥ in Thousands
Jun. 30, 2022
Jul. 31, 2021
Jun. 30, 2021
Dec. 31, 2020
Investment In Trust Scheme A        
Disclosure of financial assets [line items]        
Minimum initial investment       ¥ 100,000,000
Fair value of investment ¥ 103,537,000   ¥ 102,968,000  
Investment In Trust Scheme B        
Disclosure of financial assets [line items]        
Minimum initial investment   ¥ 100,000,000    
Fair value of investment ¥ 105,112,000