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Stock-based Compensation (Narrative) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares authorized for issuance | 1,500,000 |  |
Stock option expense | $ 3,144 | $ 3,006 | $ 2,340
Share-Based Compensation | $ 3,144 | $ 3,006 | $ 2,339
Restricted Stock [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted | 36,812 | 35,000 | 31,277
Shares granted, weighted average grant date market value |  | $ 49.79 | $ 49.55
Amortization of restricted stock bonus | $ 1,551 | $ 1,571 | $ 1,743
Total unrecognized compensation expense | $ 1,438 |  |
Total unrecognized compensation expense, weighted average period | 1 year 25 days |  |
Total fair value of shares vested | $ 527 | $ 1,112 | $ 1,389
Fair value of granted shares per share | $ 49.30 |  |
Performance-based restricted shares [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Shares granted | 36,801 | 35,602 | 30,388
Vesting period | 3 years | 3 years | 3 years
Fair value of granted shares per share | $ 49.06 | $ 49.04 | $ 49.33
Expense incurred to grant shares | $ 593 |  |
Percentage of financial goal | 108.00% |  |
Performance-based restricted shares [Member] | Minimum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of target opportunity for awards to vest | 0.00% | 0.00% | 0.00%
Performance-based restricted shares [Member] | Maximum [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Percentage of target opportunity for awards to vest | 150.00% | 150.00% | 150.00%
Performance-based restricted shares [Member] | Transaction One [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expense incurred to grant shares | $ 583 |  |
Percentage of financial goal | 118.00% |  |
Performance-based restricted shares [Member] | Transaction Two [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expense incurred to grant shares | $ 674 |  |
Percentage of financial goal | 117.00% |  |
SARs [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total unrecognized compensation expense | $ 0 |  |
Total intrinsic value of options exercised | $ 2,022 | $ 1,110 |
Average remaining contractual term | 2 years 11 months 1 day | 3 years 6 months |
Outstanding, Aggregate Intrinsic Value | $ 3,908 | $ 5,468 |
Share-Based Compensation | $ 0 |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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