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Equity Plans Equity Plans (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) purchase_interval shares | Dec. 31, 2014 USD ($) shares | Dec. 31, 2013 USD ($) shares
Summary of Activity under the Plan [Abstract] |  |  |
Compensation costs charged to income | $ 1,603 | $ 1,031 | $ 912
Proceeds from the exercise of stock options and similar instruments | 895 | 1,917 | 1,004
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net | $ 634 | $ 462 | $ 28
Employee Stock Purchase Plan [Abstract] |  |  |
Number of purchases intervals under the plan since inception | purchase_interval | 19 |  |
Shares issued during the period under the plan | shares | 33,318 | 35,682 | 30,869
Cash received from employees toward purchases under the plan | $ 916 | $ 854 | $ 796
Restricted Stock and Deferred Restricted Stock [Member] |  |  |
Summary of Activity under the Plan [Abstract] |  |  |
Compensation costs charged to income | 1,445 | 883 | 784
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net | 634 | $ 249 | $ 97
Employee Stock Purchase Plan [Abstract] |  |  |
Unrecognized compensation cost | $ 1,231 |  |
Deferred Restricted Stock Awards [Member] |  |  |
Dividend Equivalent Rights [Abstract] |  |  |
Cumulative dividend equivalent rights converted to deferred restricted stock awards | shares | 70,691 | 66,458 | 61,733
Employee Stock Option [Member] |  |  |
Summary of Activity under the Plan [Abstract] |  |  |
Proceeds from the exercise of stock options and similar instruments | $ 0 | $ 1,044 | $ 198
Adjustment to Additional Paid in Capital, Income Tax Effect from Share-based Compensation, Net | 0 | 213 | (69)
Dividend Equivalent Rights [Member] |  |  |
Dividend Equivalent Rights [Abstract] |  |  |
Liability for dividend equivalent rights | $ 114 | $ 122 | $ 128
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 | 516,956 | 429,352 | 341,914
Shares issuable under the plan upon exercise of outstanding awards | shares | 245,976 | 296,831 | 307,919
Number of shares available for grant | shares | 1,037,068 |  |
Employee Stock [Member] |  |  |
Summary of Activity under the Plan [Abstract] |  |  |
Compensation costs charged to income | $ 158 | $ 148 | $ 128
Proceeds from the exercise of stock options and similar instruments | $ 895 | 839 | 722
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 | $ 162 | 151 | 140
Unrecognized compensation cost | $ 64 |  |
Employee Stock [Member] | Common Stock [Member] |  |  |
Option Indexed to Issuer's Equity [Line Items] |  |  |
Number of shares reserved for issuance under the plan | shares | 400,000 |  |
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 | $ 34 | $ 84
Employee Stock Purchase Plan [Abstract] |  |  |
Shares issued under the plan | shares |  | 829 | 3,487

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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=31042434&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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