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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