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Credit risk (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Statement [Line Items]    
Loan receivables ¥ 762,992 ¥ 765,034
Accrued interest 377,983 273,923
Gross loan receivables 1,140,975 1,038,957
Loss allowance (478,792) (423,773)
Carrying amount 662,183 615,184
Stage 1 [Member]    
Statement [Line Items]    
Loan receivables 0 0
Gross loan receivables 0 0
Loss allowance 0 0
Carrying amount 0 0
Stage 3 [Member]    
Statement [Line Items]    
Loan receivables 762,992 765,034
Accrued interest 377,983 273,923
Gross loan receivables 1,140,975 1,038,957
Loss allowance (478,792) (423,773)
Carrying amount 662,183 615,184
Stage 2 [Member]    
Statement [Line Items]    
Loan receivables 0 0
Gross loan receivables 0 0
Loss allowance 0 0
Carrying amount ¥ 0 ¥ 0