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Securitization debt (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
CNY (¥)
Dec. 31, 2018
CNY (¥)
Securitization debt      
Securitization debt $ 140,935 ¥ 760,000 ¥ 969,000
Weighted average interest rate of securitization debt 5.44 5.36  
Asset-backed Securities ("ABS")      
Securitization debt      
Aggregate amount offered   ¥ 800,000 500,000
100% of the subordinated securities   40,000 25,000
Securitization debt   ¥ 760,000 475,000
Asset-backed notes("ABN")      
Securitization debt      
Aggregate amount offered     520,000
100% of the subordinated securities     26,000
Securitization debt     ¥ 494,000