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FAIR VALUE OF ASSETS AND LIABILITIES - Narrative (Details) - USD ($)
$ in Thousands
1 Months Ended
Mar. 31, 2020
Sep. 30, 2021
Jun. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Real estate held for sale   $ 892  
Certain premises and real estate owned      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Asset impairment charges $ 12,800    
Real estate held for sale     $ 5,300
Real estate owned      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Asset impairment charges $ 1,400    
Real estate held for sale     $ 624