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Related party balances and transactions (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
item
Dec. 31, 2019
CNY (¥)
item
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Related party balances and transactions        
Loan from related parties       ¥ 285,467,540
Loan repayment to related parties       392,113,384
Loan provided to related parties       ¥ 217,000,000
Consideration paid equal to principal amount of loan assets $ 54,583,585 ¥ 380,000,000    
Interest income 3,894,331 ¥ 27,111,557    
Loan portfolios transferred | $ $ 15,600,000      
Jiangxi Ruijing        
Related party balances and transactions        
Guarantee provided over the worth of loans     ¥ 1,333,503,026  
Guarantee fees received from borrowers     21,918,796  
Remittance to related party as a security deposit     ¥ 20,000,000  
Number of earnings rights purchased | item 2 2    
Jiangxi Ruijing | Loan 1        
Related party balances and transactions        
Loan portfolios transferred $ 14,364,101 ¥ 100,000,000    
Jiangxi Ruijing | Loan 2        
Related party balances and transactions        
Loan portfolios transferred $ 40,219,483 280,000,000    
Zijinzhonghao (Zhejiang) Investment Co., Ltd.        
Related party balances and transactions        
Loan portfolios transferred   ¥ 108,700,000