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GOODWILL AND INTANGIBLE ASSETS (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Goodwill [Roll Forward]      
Beginning of year $ 21,824 $ 21,824 $ 21,824
Acquired goodwill 0 0  
Ending balance 21,824 21,824 21,824
Finite-lived intangible assets, net [Abstract]      
Balance Acquired 11,608   11,608
Accumulated Amortization 11,451   11,350
Aggregate amortization expense 101 $ 132  
Finite-lived intangible assets, future amortization expense [Abstract]      
2021 157    
Total 157    
Core deposit intangibles      
Finite-lived intangible assets, net [Abstract]      
Balance Acquired 5,975   5,975
Accumulated Amortization 5,975   5,962
Other customer relationship intangibles      
Finite-lived intangible assets, net [Abstract]      
Balance Acquired 5,633   5,633
Accumulated Amortization $ 5,476   $ 5,388