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Derivative Financial Instruments (Narrative Disclosures) (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Derivatives          
Accumulated Derivative Credit Valuation Adjustment $ 38,000   $ 38,000   $ 38,000
Unrealized gains on interest rate swaps 5,713,000 $ 3,452,000 7,844,000 $ 9,496,000  
Interest rate swap agreements on loans with third-party counter parties          
Derivatives          
Interest rate swaps - assets, fair value 78,700,000   78,700,000    
Interest rate swaps - liabilities, fair value 291,000   291,000    
Interest rate swap related to AFS securities | Designated as Hedging Instrument          
Derivatives          
Unrealized gains on interest rate swaps 421,000 215,000 353,000 592,000  
Gain recognized in income on ineffective portion of hedges 0 0 0 0  
Interest rate swap related to FHLB borrowings | Designated as Hedging Instrument          
Derivatives          
Unrealized gains on interest rate swaps 5,300,000 3,200,000 7,500,000 8,900,000  
Gain recognized in income on ineffective portion of hedges $ 0 $ 0 $ 0 $ 0