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Fair value of assets and liabilities - Loans, Payables to investors at fair value (Details)
12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CNY (¥)
Dec. 31, 2018
CNY (¥)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2019
CNY (¥)
Loans at fair value          
Balance at beginning of the year   ¥ 33,417,119      
Balance at the end of the year $ 399,657,112 2,782,332,885 ¥ 33,417,119    
Changes in fair value related to balance outstanding at the end of the year (8,964,938)   (1,750,429)   ¥ (62,412,104)
Payables to investors at fair value          
Initial contribution 619,532,305 4,313,060,000   ¥ 1,096,800,000  
Principal payment (187,697,223) (1,306,710,525) (696,800,000) (1,160,000,000)  
Change in fair value (9,216,371) (64,162,533) (12,358,626) 9,750,565  
Balance at the end of the year 431,835,082 3,006,349,475      
Xiaoying Credit Loan          
Loans at fair value          
Changes in fair value related to balance outstanding at the end of the year (8,964,938)   (1,750,429)   (62,412,104)
Recurring          
Loans at fair value          
Balance at beginning of the year   33,417,119      
Balance at the end of the year 399,657,112 2,782,332,885 33,417,119    
Payables to investors at fair value          
Balance at the end of the year 431,835,082 3,006,349,475      
Recurring | Level 3          
Loans at fair value          
Balance at beginning of the year   33,417,119 667,838,880    
Origination of loan principal     49,498,710    
Collection of principal     (744,351,887)    
Reinvestment of principal     18,353,661    
Change in fair value     42,077,755    
Balance at the end of the year 399,657,112 2,782,332,885 33,417,119 667,838,880  
Payables to investors at fair value          
Balance at beginning of the year     667,080,871    
Initial contribution 619,532,305 4,313,060,000      
Principal payment (187,697,223) (1,306,710,525) (696,800,000)    
Change in fair value     29,719,129    
Balance at the end of the year 431,835,082 3,006,349,475   667,080,871  
Unpaid balance of loans at fair value 390,692,174   35,167,548   2,719,920,781
Unpaid balance of payable to investors 431,835,082   0   ¥ 3,006,349,475
Recurring | Level 3 | Xiaoying Credit Loan          
Loans at fair value          
Balance at beginning of the year 4,800,069 33,417,119 427,347,002    
Origination of loan principal 709,326,763 4,938,191,061 49,498,710    
Collection of principal (425,452,142) (2,961,912,723) (476,783,941)    
Reinvestment of principal 101,766,051 708,474,895      
Change in fair value 9,216,371 64,162,533 33,355,348    
Balance at the end of the year $ 399,657,112 ¥ 2,782,332,885 33,417,119 427,347,002  
Recurring | Level 3 | Xiaoying Housing Loan          
Loans at fair value          
Balance at beginning of the year     240,491,878    
Collection of principal     (267,567,946)    
Reinvestment of principal     18,353,661    
Change in fair value     ¥ 8,722,407    
Balance at the end of the year       ¥ 240,491,878  
Weighted average | Discount rates | Level 3          
Fair value of assets and liabilities          
Loans and payable to investors, input 8.28   7.12   8.28
Weighted average | Net cumulative expected loss rates | Level 3          
Fair value of assets and liabilities          
Loans and payable to investors, input 9.99   7.59   9.99