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Property and equipment (Details) - CNY (¥)
¥ in Thousands
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Property and equipment      
Beginning of the year ¥ 244,412 ¥ 224,284  
Additions 98,600 163,583  
Disposals, net (75,711) (7,008)  
Depreciation charge (119,309) (135,975) ¥ (138,531)
Exchange difference 3,409 (472)  
End of the year 151,401 244,412 224,284
Gross carrying amount      
Property and equipment      
Beginning of the year 697,036 559,520  
End of the year 593,936 697,036 559,520
Accumulated depreciation and amortisation [member]      
Property and equipment      
Beginning of the year (446,994) (330,077)  
End of the year (440,314) (446,994) (330,077)
Exchange Difference [Member]      
Property and equipment      
Beginning of the year 5,630 5,159  
End of the year 2,221 5,630 5,159
Office and telecommunication equipment      
Property and equipment      
Beginning of the year 58,448 51,039  
Additions 15,481 30,484  
Disposals, net (9,467) (1,285)  
Depreciation charge (23,027) (21,682)  
Exchange difference 420 (108)  
End of the year 41,855 58,448 51,039
Office and telecommunication equipment | Gross carrying amount      
Property and equipment      
Beginning of the year 126,626 103,462  
End of the year 120,373 126,626 103,462
Office and telecommunication equipment | Accumulated depreciation and amortisation [member]      
Property and equipment      
Beginning of the year (65,102) (49,454)  
End of the year (75,862) (65,102) (49,454)
Office and telecommunication equipment | Exchange Difference [Member]      
Property and equipment      
Beginning of the year 3,076 2,969  
End of the year 2,656 3,076 2,969
Right-of-use properties      
Property and equipment      
Beginning of the year 144,001 120,941  
Additions 76,534 118,030  
Disposals, net (57,952) (5,723)  
Depreciation charge (75,519) (88,974)  
Exchange difference 2,510 (273)  
End of the year 89,574 144,001 120,941
Right-of-use properties | Gross carrying amount      
Property and equipment      
Beginning of the year 461,605 362,322  
End of the year 358,173 461,605 362,322
Right-of-use properties | Accumulated depreciation and amortisation [member]      
Property and equipment      
Beginning of the year (316,267) (240,317)  
End of the year (269,772) (316,267) (240,317)
Right-of-use properties | Exchange Difference [Member]      
Property and equipment      
Beginning of the year 1,337 1,064  
End of the year (1,173) 1,337 1,064
Leasehold improvements      
Property and equipment      
Beginning of the year 41,963 52,304  
Additions 6,585 15,069  
Disposals, net (8,292)    
Depreciation charge (20,763) (25,319)  
Exchange difference 479 (91)  
End of the year 19,972 41,963 52,304
Leasehold improvements | Gross carrying amount      
Property and equipment      
Beginning of the year 108,805 93,736  
End of the year 115,390 108,805 93,736
Leasehold improvements | Accumulated depreciation and amortisation [member]      
Property and equipment      
Beginning of the year (65,625) (40,306)  
End of the year (94,680) (65,625) (40,306)
Leasehold improvements | Exchange Difference [Member]      
Property and equipment      
Beginning of the year 1,217 1,126  
End of the year ¥ 738 ¥ 1,217 ¥ 1,126