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Employee Benefit Plans (Narrative) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]      
Defined Contribution Plan, Employer Contributions, Vesting Period 4 years    
Defined Contribution Plan, Cost $ 1,367,000 $ 1,270,000  
Defined Benefit Plan, Benefit Obligation 5,435,000 5,692,000 $ 5,747,000
Defined Benefit Plan, Net Periodic Benefit Cost 49,000 68,000  
Defined Benefit Plan, Benefits Paid 441,000 $ 464,000  
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months 462,000    
Defined Benefit Plan, Expected Future Benefit Payments, Year Five 424,000    
Defined Benefit Plan, Expected Future Benefit Payments, Year Four 435,000    
Defined Benefit Plan, Expected Future Benefit Payments, Year Three 447,000    
Defined Benefit Plan, Expected Future Benefit Payments, Year Two 457,000    
Defined Benefit Plan, Expected Future Benefit Payment $ 2,071,000    
Projected Benefit Obligation, Projected Discount Rate 5.18% 5.68%  
Change in Projected Benefit Obligation from Change in Projected Discount Rate $ 254,000    
Defined Benefit Plan, Accumulated Benefit Obligation 5,435,000 $ 5,692,000  
Accumulated Postretirement Benefit Obligation 1,903,000 1,818,000  
Supplemental Employee Retirement Plan, Defined Benefit [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Benefit Obligation 3,669,000 3,697,000  
Pension and Other Postretirement Benefits Cost (Reversal of Cost) 444,000 655,000  
Cash Surrender Value of Life Insurance 46,657,000 46,439,000  
Defined Benefit Plan, Net Periodic Benefit Cost 85,000 87,000  
Other Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Net Periodic Benefit Cost 7,000 7,000  
Defined Benefit Plan, Contributions by Employer $ 7,000 $ 7,000  
Defined Benefit Plan, Percentage of Plan Funded 101.80% 102.00%  
JPMCB LDI Diversified Balanced Fund [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Investment concentration 96.00% 98.00%  
Maximum [Member] | Other Postretirement Benefits [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Contribution Percentage 5.00%    
Commingled Pensions Trust Fund [Member] | Minimum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Plan Asset Allocations 10.00%    
Commingled Pensions Trust Fund [Member] | Minimum [Member] | Global Equity, Global Fixed Income, Real Estate And Cash-Plus [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Plan Asset Allocations 35.00%    
Commingled Pensions Trust Fund [Member] | Maximum [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Plan Asset Allocations 65.00%    
Commingled Pensions Trust Fund [Member] | Maximum [Member] | Global Equity, Global Fixed Income, Real Estate And Cash-Plus [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Defined Benefit Plan, Target Plan Asset Allocations 90.00%    
Short-Term Investment Fund (STIF) [Member] | Other Investments [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Investment concentration 96.00% 98.00%  
Investment amount $ 7,100,000 $ 2,600,000