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Stockholders' Equity (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Oct. 25, 2017
Feb. 25, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares Reserved (in shares) 1,768,000      
Shares Available to Issue (in shares) 1,230,000      
Payments of Ordinary Dividends, Common Stock $ 1,207,000 $ 833,000    
Options Outstanding (in shares) 1,864,000      
Performance Awards Outstanding (in shares) 532,000      
Unrecognized share based compensation, expected term (in Duration) 2 years 8 months 12 days      
Directors compensation expense $ 84,000 $ 90,000    
Stock repurchase program, authorized amount $ 26,000,000   $ 40,000,000.0 $ 25,000,000.0
Stock Repurchase Program, Authorized Amount, Additional     $ 15,000,000.0  
Dividends declared per common share (in dollars per Share) $ 0.075 $ 0.05    
Dividends $ 1,200,000 $ 800,000    
Dividends (in dollars per share)   $ 0.05    
Share-Based Compensation Aggrangement, By Share-Based Payment Award, Equity Instrument Other Than Options, Percent Represented By Relative Shareholder Return Performance 50.00%      
Risk-free interest rate   1.44%    
Share-Based Compensation Arrangement By Share-Based Payment Award, Non-Option Equity Instruments, Reserved Percentage 200.00%      
ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Dividend yield 0.01%      
Shares purchased through Employee Stock Purchase Plan (in Shares) 13,938      
Weighted average purchase price of ESPP shares purchased during the period (in Dollars per share) $ 22.07      
Share-based compensation expense $ 97,000 $ 96,000    
Expected volatility 20.89%      
Expected holding period (years)   3 months    
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 245,000 $ 189,000    
Stock Granted, Value, Share-based Compensation, Net of Forfeitures 2,000,000      
Unrecognized share based compensation $ 2,300,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 77,260      
Restricted Stock | Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years      
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Dividend yield 1.18%      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage 20.00%      
Share-based compensation expense $ 500,000      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years      
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years      
Stock Granted, Value, Share-based Compensation, Net of Forfeitures $ 1,400,000      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross 212,853      
Grants in period, weighted average exercise price (in dollars per share) $ 25.43      
Expected volatility 27.08%      
Risk-free interest rate 2.65%      
Expected holding period (years) 5 years      
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 113,320      
Officers And Key Employees [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Directors compensation expense $ 276,000 $ 55,000    
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value $ 2,900,000      
Amended And Restated 2006 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares Reserved (in shares) 0      
Shares Available to Issue (in shares) 0      
Options Outstanding (in shares) 1,641,000      
Performance Awards Outstanding (in shares) 303,000      
Cancelled shares (in shares) 213,000      
2017 Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares Reserved (in shares) 1,768,000      
Shares Available to Issue (in shares) 1,230,000      
Options Outstanding (in shares) 223,000      
Performance Awards Outstanding (in shares) 229,000