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LOANS AND ALLOWANCE FOR LOAN LOSSES - Troubled Debt Restructuring Narrative (Details)
3 Months Ended
Mar. 31, 2021
USD ($)
loan
contract
Mar. 31, 2020
contract
loan
Dec. 31, 2020
USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of loans | loan 2 0  
Post-modification outstanding recorded investment $ 2,488,000    
Financing receivable, troubled debt restructuring 8,300,000   $ 6,700,000
Financing receivable, troubled debt restructuring, purchased with credit deterioration, increase 400,000   400,000
Financing receivable, modifications, recorded investment, still accruing 2,600,000   2,800,000
Additional amounts committed to customers with loans classified as troubled debt restructurings 0   0
Financing receivables, impaired, troubled debt restructuring, write-down $ 0    
Financing receivable, troubled debt restructuring, subsequent default, number of contracts | contract 0 0  
Non-accrual Status      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Financing receivable, modifications, recorded investment, nonaccrual status $ 5,700,000   $ 3,900,000
Commercial And Consumer Portfolio Segment      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of loans remaining in modified status | loan 38    
Loan balance remaining in modified status $ 26,300,000    
Number of loans remaining in modified status, modified more than once | loan 22    
Loan balance remaining in modified status, modified more than once $ 21,400,000    
Commercial and Agricultural | Commercial and industrial      
Financing Receivable, Troubled Debt Restructuring [Line Items]      
Number of loans | loan 2