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Organization and principal activities (Details 2) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about business combination [line items]      
Interest income on loans ¥ 141,857 ¥ 119,639 ¥ 104,896
Net profit 8,155 28,826 41,948
VIEs [Member]      
Disclosure of detailed information about business combination [line items]      
Interest income on loans 141,857 119,639 104,896
Net profit ¥ 15,794 ¥ 30,676 ¥ 41,948