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Organization and principal activities (Details 2) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement [Line Items]      
Interest income on loans ¥ 105,570 ¥ 118,396 ¥ 141,857
VIEs [Member]      
Statement [Line Items]      
Interest income on loans 105,570 118,396 141,857
Net profit ¥ 19,854 ¥ 58,616 ¥ 8,155