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Shareholders' Equity (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Equity, Class of Treasury Stock [Line Items]    
Common Stock, Par Value Per Share $ 1 $ 1
Repurchase plan period, in years 1 year  
Shares held at cost 339,741 320,575
Common stock shares authorized 15,000,000 15,000,000
Dividend Reinvestment Plan (DRIP) [Member]    
Equity, Class of Treasury Stock [Line Items]    
Common stock shares authorized 1,000,000  
Addition to capital from dividend reinvestment plan $ 1.4  
Shares purchased through DRIP, shares 46,458  
Dividend Reinvestment plan shares remain to be issues 220,452  
Shares Repurchased 150,000  
Dividend Reinvestment Plan (DRIP) - Quarterly Dividends [Member]    
Equity, Class of Treasury Stock [Line Items]    
Addition to capital from dividend reinvestment plan $ 1.0  
Dividend Reinvestment Plan (DRIP) - Optional Cash Contributions [Member]    
Equity, Class of Treasury Stock [Line Items]    
Addition to capital from dividend reinvestment plan $ 312.0