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Credit risk (Details 2) - CNY (¥)
¥ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Credit Risk Details 2    
Guarantee backed loans ¥ 732,530 ¥ 400,460
Collateral backed loans    
Collateralized by property 68,060 76,200
Collateralized by shares 12,480 172,770
Collateralized by precious metals 1,400 44,500
Collateralized by other personal property 1,044 3,144
Collateralized by account receivable 2,600
Total ¥ 818,114 ¥ 697,074