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GOODWILL AND OTHER INTANGIBLE ASSETS, NET - Goodwill (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Changes in the carrying amount of goodwill    
Balance, beginning of period $ 28,388,000 $ 11,942,000
Goodwill arising in business combination 24,117,000 16,446,000
Balance, end of period 52,505,000 28,388,000
Goodwill impairment $ 0 $ 0