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FAIR VALUE OF ASSETS AND LIABILITIES (Narrative) (Details)
$ in Thousands
Mar. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Loans, weighted average discount rate, percent 7.01% 6.86%    
Time deposits, weighted average discount rate, percent 5.46% 5.48%    
Long -term debt, weighted average discount rate, percent 7.17% 6.83%    
Weighted average | Weighted-average discount rate | Interest rate swap agreements | Derivatives Not in Cash Flow Hedging Relationship | Derivative Financial Instruments Designated as Hedging Instruments        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Derivative, measurement input 0.0391 0.0334    
Mortgage revenue bonds        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Aggregate fair value $ 16,402 $ 13,590 $ 11,749 $ 13,254
Mortgage revenue bonds | Weighted average | Weighted-average discount rate        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Weighted average prepayment speed assumption 0.0643 0.0612    
Mortgage revenue bonds | States and political subdivisions        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Aggregate fair value $ 6,323 $ 6,436 6,594 6,584
Number of investment securities held | security 2      
Mortgage revenue bonds | Residential - Non-government agencies        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Aggregate fair value $ 704 $ 714 $ 711 $ 684
Number of investment securities held | security 2