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Earnings Per Common Share And Share Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Earnings Per Common Share And Share Awards [Line Items] |  |  |
Anti-dilutive shares excluded from computation of diluted earnings per share | 15 |  |
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ 266 |  |
SARs |  |  |
Earnings Per Common Share And Share Awards [Line Items] |  |  |
SARs expiration period | 7 years |  |
Number of SARs granted where exercise price was less than market price on date of grant | 0 | 0 |
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Net of Forfeitures | 0 | 7 | 14
Share-based Compensation Arrangement by Share-based Payment Award, Grants in Period, Weighted Average Grant Date Fair Value |  | $ 35.49 |
Share-based Payment Arrangement, Expense | $ 71 | $ 118 |
Maximum | SARs |  |  |
Earnings Per Common Share And Share Awards [Line Items] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Purchased for Award | 250 |  |
SARs vesting period | 5 years |  |

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