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Credit risk (Details) - CNY (¥)
Dec. 31, 2021
Dec. 31, 2020
Statement [Line Items]    
Loan Receivables ¥ 754,393,000 ¥ 762,992,000
Accrued Interest 398,610,000 377,983,000
Gross Loan Receivables 1,153,003,000 1,140,975,000
Credit Impairment Losses (597,870,000) (478,792,000)
Carrying Amount 555,133,000 662,183,000
Stage 1 [Member]    
Statement [Line Items]    
Loan Receivables 0 0
Accrued Interest 0 0
Gross Loan Receivables 0 0
Credit Impairment Losses 0 0
Carrying Amount 0 0
Stage 3 [Member]    
Statement [Line Items]    
Loan Receivables 754,393,000 762,992,000
Accrued Interest 398,610,000 377,983,000
Gross Loan Receivables 1,153,003,000 1,140,975,000
Credit Impairment Losses (597,870,000) (478,792,000)
Carrying Amount 555,133,000 662,183,000
Stage 2 [Member]    
Statement [Line Items]    
Loan Receivables 0 0
Accrued Interest 0 0
Gross Loan Receivables 0 0
Credit Impairment Losses 0 0
Carrying Amount ¥ 0 ¥ 0