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ACQUISITIONS AND GOODWILL (Tables)
 12 Months Ended
Dec. 31, 2020
Business Acquisitions and Goodwill [Abstract]  
Summary of Changes in the Carrying Amount of Goodwill A summary of changes in the carrying amount of goodwill follows (in thousands):    
WestCentralEastFinancial ServicesCorporateTotal
Balance at January 1, 2019$— $— $32,962 $— $— $32,962 
Additions— — — — — — 
Balance at December 31, 2019— — 32,962 — — 32,962 
Additions— — — — — — 
Balance at December 31, 2020$— $— $32,962 $— $— $32,962