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Distribution of profit (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Distribution of Profit      
Reserve level threshold for mandatory transfer requirement (as a percent) 50.00%    
Percentage of annual appropriation to general reserve fund required 10.00%    
Transferred to general reserve ¥ 121,069 ¥ 95,617 ¥ 84,873
Parent company      
Distribution of Profit      
Amount of restricted capital and reserves not available for dividend distribution ¥ 6,637,007