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Segment information and revenue - Interest and commission income (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Virtual Bank Business      
Disclosure of offsetting of financial assets [line items]      
Interest and commission income ¥ 106,540 ¥ 34,320 ¥ 3,177