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Compensation Plans (Deferred Stock) (Details) - Deferred Stock [Member] - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Compensation expense | $ 0.7 | $ 0.7 | $ 0.7
Unrecognized compensation expense | $ 0.9 |  |
Unrecognized compensation cost, recognition period | 3 years |  |
Director [Member] | Vesting in May 2020 [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Deferred stock awards issued | 6,336 |  | 6,360
Director [Member] | Vesting in May 2022 [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Deferred stock awards issued | 7,719 |  |
Director [Member] | Vesting in May 2019 [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Deferred stock awards issued |  | 5,767 |
Director [Member] | Vesting May 2021 [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Deferred stock awards issued |  | 6,751 |
Director [Member] | Vesting May 2018 [Member] |  |  |
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items] |  |  |
Deferred stock awards issued |  |  | 5,432

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