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Equity Plans Equity Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Summary of Activity under the Plan [Abstract] |  |  |
Compensation costs charged to income | $ 2,117 | $ 2,643 | $ 1,691
Proceeds from the exercise of stock options and similar instruments | 1,371 | 1,215 | 954
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net |  |  | $ 203
Excess Tax Benefit from Share-based Compensation, Financing Activities | $ 0 | $ 0 |
Employee Stock Purchase Plan [Abstract] |  |  |
Shares issued during the period under the plan | 25,907 | 27,743 | 30,214
Cash received from employees toward purchases under the plan | $ 1,523 | $ 1,282 | $ 1,060
Restricted Stock and Deferred Restricted Stock [Member] |  |  |
Summary of Activity under the Plan [Abstract] |  |  |
Compensation costs charged to income | 1,875 | 2,429 | 1,523
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net |  |  | $ 203
Excess Tax Benefit from Share-based Compensation, Financing Activities | 0 | $ 0 |
Employee Stock Purchase Plan [Abstract] |  |  |
Unrecognized compensation cost | $ 1,801 |  |
Deferred Restricted Stock Awards [Member] |  |  |
Dividend Equivalent Rights [Abstract] |  |  |
Cumulative dividend equivalent rights converted to deferred restricted stock awards | 79,478 | 77,034 | 74,403
Dividend Equivalent Rights [Member] |  |  |
Dividend Equivalent Rights [Abstract] |  |  |
Liability for dividend equivalent rights | $ 97 | $ 139 | $ 114
Incentive Plan [Member] |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Number of shares reserved for issuance under the plan | 1,800,000 |  |
Maximum number of shares per employee | 600,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued Pursuant To The Plan | 793,811 | 628,546 | 576,074
Shares issuable under the plan upon exercise of outstanding awards | 124,275 | 228,885 | 229,972
Number of shares available for grant | 881,914 |  |
Employee Stock Purchase Plan [Member] |  |  |
Summary of Activity under the Plan [Abstract] |  |  |
Compensation costs charged to income | $ 242 | $ 214 | $ 168
Proceeds from the exercise of stock options and similar instruments | $ 1,371 | 1,215 | 954
Employee Stock Purchase Plan [Abstract] |  |  |
Purchase price of common stock to employees under the plan, percent | 85.00% |  |
Maximum amount of base salary employees can designate for share purchase under the plan | 10.00% |  |
Expenses recorded under the plan | $ 265 | $ 229 | $ 185
Unrecognized compensation cost | $ 111 |  |
Common Stock [Member] | Employee Stock Purchase Plan [Member] |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Number of shares reserved for issuance under the plan | 400,000 |  |

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