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FAIR VALUE OF ASSETS AND LIABILITIES (Narrative) (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
security
Dec. 31, 2022
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Loans, weighted average discount rate, percent 8.01%      
Time deposits, weighted average discount rate, percent 5.64%      
Long -term debt, weighted average discount rate, percent 7.68%      
Mortgage revenue bonds        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 17,169 $ 13,254 $ 14,333 $ 8,619
Mortgage revenue bonds | States and political subdivisions        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Number of investment securities held | security 2      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 6,363 6,584 6,682 7,681
Mortgage revenue bonds | Residential - Non-government agencies        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Number of investment securities held | security 2      
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value $ 671 $ 684 $ 735 $ 938
Weighted average | Weighted-average discount rate | Interest rate swap agreements | Derivatives Not in Cash Flow Hedging Relationship | Designated as Hedging Instrument        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative, measurement input 0.0412 0.0331    
Weighted average | Mortgage revenue bonds | Weighted-average discount rate        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Weighted average prepayment speed assumption 0.0677 0.0641