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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details)
3 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Contract
Dec. 31, 2020
USD ($)
Contract
Dec. 31, 2019
USD ($)
Contract
Financing Receivable Allowance For Credit Losses [Line Items]            
Loans to related parties       $ 44,052,000 $ 52,559,000  
Allowance for credit losses provision       (1,700,000) 13,200,000 $ 1,250,000
Loans classified in doubtful or loss risk rating       $ 0 $ 0  
Number of loans modified as TDRs | Contract       1 4 4
Increase in allowance for loan losses due to TDRs       $ 0 $ 0  
Troubled debt restructuring charge-offs       0 0  
Interest income if accrual method       141,000 821,000  
Unfunded commitments of related party loans       $ 40,244,000    
COVID-19            
Financing Receivable Allowance For Credit Losses [Line Items]            
Allowance for credit losses provision         $ 13,200,000  
Provision for Other Credit Losses $ 700,000 $ 1,000,000 $ 0