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LEASES - Narrative (Details)
¥ in Thousands
12 Months Ended
Dec. 31, 2021
CNY (¥)
contract
Dec. 31, 2020
CNY (¥)
contract
Dec. 31, 2019
CNY (¥)
LEASES      
Sublease Income ¥ 134,000 ¥ 112,000 ¥ 121,000
Negative lease expense recognized under the relief using variable lease expense approach ¥ 88,000 ¥ 250,000  
Lease expense     ¥ 3,104,000
Number of lease contracts | contract 32 31  
Non-cancellable lease contracts not reflected in consolidate balance sheets ¥ 8,732 ¥ 8,511,000