Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Equity, Class of Treasury Stock [Line Items]
Common Stock, Par or Stated Value Per Share	$ 1	$ 1
Repurchase plan period, in years	1 year
Shares held at cost	357,096	292,606
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	$ 1,300
Shares purchased through DRIP, shares	36,928
Dividend Reinvestment plan shares remain to be issues	536,374
Dividend Reinvestment Plan (DRIP) - Quarterly Dividends [Member]
Equity, Class of Treasury Stock [Line Items]
Addition to capital from dividend reinvestment plan	$ 823
Dividend Reinvestment Plan (DRIP) - Optional Cash Contributions [Member]
Equity, Class of Treasury Stock [Line Items]
Addition to capital from dividend reinvestment plan	$ 493
Incentive Stock Option Plan [Member]
Equity, Class of Treasury Stock [Line Items]
Shares acquired	610