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Benefit Plans (Components of shares eligible to be issued under the Directors Plan) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Eligible shares, unissued 105,654 59,162
Director [Member]    
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]    
Eligible shares, unissued 83,710 117,053
Eligible shares, shares held in Rabbi Trust 105,654 59,162
Eligible shares, total 189,364 176,215
Market value, unissued $ 2,135 $ 2,291
Market value, shares held in Rabbi Trust 2,694 1,158
Market value, total $ 4,829 $ 3,449