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Cash and cash equivalents (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Cash and cash equivalents.        
Cash on hand ¥ 12 ¥ 12    
Cash at central bank   134,486    
Cash at banks 1,947,910 1,244,975    
Cash and cash equivalents, end of the year ¥ 1,947,922 ¥ 1,379,473 ¥ 1,907,776 ¥ 1,399,370