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Stock-Based Compensation Plans (Schedule of Compensation Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Restricted Stock Units (RSUs) [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Compensation expense(1) | $ 475 | $ 389 | $ 263
Income tax benefit | 102 | 84 | 57
Fair value of grants vested | 407 | 302 | 149
Restricted Stock [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Compensation expense(1) | 781 | 751 | 916
Income tax benefit | 168 | 161 | 197
Fair value of grants vested | 772 | 780 | 931
Management Stock Purchase Plan [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Compensation expense(1) | 71 | 95 | 104
Income tax benefit | 15 | 20 | 22
Fair value of grants vested | 110 | 75 | 130
Performance Shares [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Compensation expense(1) | 332 | 532 | 291
Income tax benefit | 71 | 114 | 63
Fair value of grants vested | 0 | 344 | 284
Deferred Stock Awards [Member] |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Compensation expense(1) | 122 | 110 | 106
Income tax benefit | 26 | 24 | 23
Fair value of grants vested | $ 129 | $ 102 | $ 105

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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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