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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)
 12 Months Ended
Dec. 31, 2023
USD ($)
segment
branchOffice
county
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
Jan. 01, 2024
USD ($)
Dec. 31, 2020
USD ($)
Summary Of Significant Accounting Policies [Line Items]          
Number of branch offices | branchOffice 53        
Number of counties where branch offices are located | county 15        
Investment loans excluding accrued interest $ 21,500,000 $ 18,400,000      
Accrued interest location Interest Receivable Interest Receivable      
Threshold for loans individually analyzed for impairment $ 250,000        
Investment in limited partnerships 13,000,000.0 $ 12,200,000      
Commitment to fund limited partnerships 2,800,000 3,900,000      
Balance of real estate owned 384,000 100,000      
Loan servicing fees $ 1,200,000 $ 1,200,000 $ 1,200,000    
Loan servicing fees location Mortgage banking income (loss) Mortgage banking income (loss) Mortgage banking income (loss)    
Mortgage servicing rights $ 2,200,000 $ 2,700,000      
Unpaid principal balances 333,100,000 364,300,000      
Escrow deposit 1,500,000 1,700,000      
Bank owned life insurance 109,114,000 108,407,000      
Accumulated impairment loss $ 0 $ 0 $ 0    
Treasury stock (in shares) | shares 473,120 475,902      
Shares purchased under director deferred compensation plan included in treasury stock (in shares) | shares 184,019 186,801      
Number of reportable operating segments | segment 1        
Equity $ 649,793,000 $ 568,887,000 704,906,000   $ 657,184,000
Retained Earnings          
Summary Of Significant Accounting Policies [Line Items]          
Equity 692,760,000 646,100,000 $ 583,134,000   529,005,000
Cumulative Effect, Period of Adoption, Adjustment          
Summary Of Significant Accounting Policies [Line Items]          
Equity         (6,951,000)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings          
Summary Of Significant Accounting Policies [Line Items]          
Equity         $ (6,951,000)
Cumulative Effect, Period of Adoption, Adjustment | Retained Earnings | Subsequent Event          
Summary Of Significant Accounting Policies [Line Items]          
Equity       $ 1,000,000  
Interest Rate Swap          
Summary Of Significant Accounting Policies [Line Items]          
Notional amount 826,400,000 760,500,000      
Fair value of interest rate swap asset 27,200,000 36,900,000      
Fair value of interest rate swap liability 27,200,000 36,900,000      
Life Insurance | Officer          
Summary Of Significant Accounting Policies [Line Items]          
Bank owned life insurance 104,800,000 102,500,000      
Deferred Compensation | Officer          
Summary Of Significant Accounting Policies [Line Items]          
Bank owned life insurance $ 4,300,000 $ 5,900,000      
Premises and Improvements | Minimum          
Summary Of Significant Accounting Policies [Line Items]          
Useful life 5 years        
Premises and Improvements | Maximum          
Summary Of Significant Accounting Policies [Line Items]          
Useful life 40 years        
Furniture Assets | Minimum          
Summary Of Significant Accounting Policies [Line Items]          
Useful life 3 years        
Furniture Assets | Maximum          
Summary Of Significant Accounting Policies [Line Items]          
Useful life 7 years