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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
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	320,575	269,529
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	44,943
Dividend Reinvestment plan shares remain to be issued	266,910
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	$ 390.0

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