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INCOME TAX EXPENSE/(CREDIT) - Additional Information (Details) - CNY (¥)
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jan. 14, 2015
Jan. 14, 2014
Jan. 01, 2008
Disclosure of INCOME TAX EXPENSE CREDIT [Line Items]            
Applicable tax rate 25.00% 25.00% 25.00%      
Dividend withholding tax rate       5.00% 5.00% 10.00%
Undistributed earnings ¥ 267,193,000 ¥ 329,503,000 ¥ 380,109,000      
Deferred tax liabilities recognized to the extent distributable profits earned ¥ 0 ¥ 0 ¥ 0      
Deferred tax liabilities further recognition 13,360,000 16,475,000 19,005,000      
HONG KONG            
Disclosure of INCOME TAX EXPENSE CREDIT [Line Items]            
Applicable tax rate 16.50% 16.50% 16.50%      
Dividend withholding tax rate           5.00%