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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
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 acquired |  | 400,000
Shares held at cost | 321,517 | 357,096
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 | $ 1,800 |
Shares purchased through DRIP, shares | 71,227 |
Dividend Reinvestment plan shares remain to be issues | 389,704 |
Dividend Reinvestment Plan (DRIP) - Quarterly Dividends [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Addition to capital from dividend reinvestment plan | $ 868 |
Dividend Reinvestment Plan (DRIP) - Optional Cash Contributions [Member] |  |
Equity, Class of Treasury Stock [Line Items] |  |
Addition to capital from dividend reinvestment plan | $ 968 |

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