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ALLOWANCE FOR CREDIT LOSSES - LOANS - Loan modifications to borrowers experiencing financial difficulty (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Jun. 30, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Line Items]          
Total $ 1,038,271,000   $ 1,038,271,000 $ 990,766,000  
Loans, net of unearned income 1,038,271,000   1,038,271,000    
Current period gross charge-offs, Total     3,641,000 1,849,000 $ 294,000
Maturity date extensions          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Amortized Cost Basis 37,000   37,000    
Extended Maturity and Interest Rate Reduction          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Amortized Cost Basis 6,243,000   6,243,000    
Other commercial and industrial          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Total $ 159,424,000   159,424,000    
Current period gross charge-offs, Total     480,000    
Residential mortgage          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Term extension date 15 years        
Total $ 174,670,000   174,670,000 297,971,000  
Loans, net of unearned income 174,670,000   174,670,000    
Current period gross charge-offs, Total     54,000 $ 28,000  
Residential mortgage | Maturity date extensions          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Amortized Cost Basis $ 37,000   $ 37,000    
Percentage of Total Class of Loans     0.02%    
Other commercial real estate (non-owner occupied)          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Term extension date 3 months        
Deferred interest income, period   7 months      
Deferred interest income   $ 303,000      
Total $ 240,286,000   $ 240,286,000    
Loans, net of unearned income 240,286,000   240,286,000    
Current period gross charge-offs, Total 804,000        
Other commercial real estate (non-owner occupied) | Maturity date extensions          
Financing Receivable, Allowance for Credit Loss [Line Items]          
Amortized Cost Basis $ 6,243,000   $ 6,243,000    
Percentage of Total Class of Loans     2.60%