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Organization and principal activities (Details 2) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Statement [Line Items]      
Interest income on loans ¥ 118,396 ¥ 141,857 ¥ 119,639
Net profit 58,616 8,155 28,826
VIEs [Member]      
Statement [Line Items]      
Interest income on loans 118,396 141,857 119,639
Net profit ¥ 58,616 ¥ 8,155 ¥ 28,826