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Equity Plans Equity Plans (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) purchase_interval shares | Dec. 31, 2015 USD ($) shares | Dec. 31, 2014 USD ($) shares
Summary of Activity under the Plan [Abstract] |  |  |
Compensation costs charged to income | $ 1,691 | $ 1,603 | $ 1,031
Proceeds from the exercise of stock options and similar instruments | 954 | 895 | 1,917
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net |  |  | 462
Excess Tax Benefit from Share-based Compensation, Financing Activities | $ 203 | $ 634 | $ 462
Employee Stock Purchase Plan [Abstract] |  |  |
Number of purchases intervals under the plan since inception | purchase_interval | 17 |  |
Shares issued during the period under the plan | shares | 30,214 | 33,318 | 35,682
Cash received from employees toward purchases under the plan | $ 1,060 | $ 916 | $ 854
Restricted Stock and Deferred Restricted Stock [Member] |  |  |
Summary of Activity under the Plan [Abstract] |  |  |
Compensation costs charged to income | 1,523 | 1,445 | 883
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net |  |  | $ 249
Excess Tax Benefit from Share-based Compensation, Financing Activities | 203 | $ 634 |
Employee Stock Purchase Plan [Abstract] |  |  |
Unrecognized compensation cost | $ 902 |  |
Deferred Restricted Stock Awards [Member] |  |  |
Dividend Equivalent Rights [Abstract] |  |  |
Cumulative dividend equivalent rights converted to deferred restricted stock awards | shares | 74,403 | 70,691 | 66,458
Employee Stock Option [Member] |  |  |
Summary of Activity under the Plan [Abstract] |  |  |
Proceeds from the exercise of stock options and similar instruments | $ 0 | $ 0 | $ 1,044
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net | 0 | 0 | 213
Dividend Equivalent Rights [Member] |  |  |
Dividend Equivalent Rights [Abstract] |  |  |
Liability for dividend equivalent rights | $ 114 | $ 114 | $ 122
Incentive Plan [Member] |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Number of shares reserved for issuance under the plan | shares | 1,800,000 |  |
Maximum number of shares per employee | shares | 600,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued Pursuant To The Plan | shares | 576,074 | 516,956 | 429,352
Shares issuable under the plan upon exercise of outstanding awards | shares | 229,972 | 245,976 | 296,831
Number of shares available for grant | shares | 993,954 |  |
Employee Stock Purchase Plan [Member] |  |  |
Summary of Activity under the Plan [Abstract] |  |  |
Compensation costs charged to income | $ 168 | $ 158 | $ 148
Proceeds from the exercise of stock options and similar instruments | $ 954 | 895 | 839
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 | $ 185 | 162 | $ 151
Unrecognized compensation cost | 94 |  |
Dividend Reinvestment and Stock Purchase Plan [Member] |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Number of shares reserved for issuance under the plan | shares |  |  | 3,000,000
Summary of Activity under the Plan [Abstract] |  |  |
Proceeds from the exercise of stock options and similar instruments | $ 0 | $ 0 | $ 34
Employee Stock Purchase Plan [Abstract] |  |  |
Shares issued under the plan | shares |  |  | 829
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 | shares | 400,000 |  |

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- Definition Number of shares issued during the period from a dividend reinvestment and stock purchase plan (DRSPP). A dividend reinvestment and stock purchase plan allows the shareholders to reinvest dividends paid to them by the entity on new issues of stock by the entity and to purchase additional shares. + References No definition available. + Details
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- Definition The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3255-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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