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GOODWILL AND INTANGIBLE ASSETS - Acquired intangible assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Acquired Finite-Lived Intangible Assets [Line Items]    
Balance Acquired $ 11,608 $ 11,608
Accumulated Amortization 11,593 11,350
Core deposit intangibles    
Acquired Finite-Lived Intangible Assets [Line Items]    
Balance Acquired 5,975 5,975
Accumulated Amortization 5,974 5,962
Other customer relationship intangibles    
Acquired Finite-Lived Intangible Assets [Line Items]    
Balance Acquired 5,633 5,633
Accumulated Amortization $ 5,619 $ 5,388