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Stockholders' Equity (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended 9 Months Ended
Oct. 27, 2021
Sep. 15, 2021
Aug. 12, 2021
Jun. 01, 2021
Apr. 16, 2021
Sep. 01, 2020
Jun. 01, 2020
Mar. 01, 2020
Feb. 19, 2020
Sep. 01, 2019
Jun. 03, 2019
Mar. 01, 2019
Dec. 31, 2021
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2020
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Jul. 26, 2021
May 18, 2021
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, Weighted Average Grant Date Fair Value                           $ 21.81                
Directors compensation expense                           $ 201,000     $ 250,000   $ 656,000 $ 653,000    
Dividends declared per common share (in dollars per Share)           $ 0.1000 $ 0.1000 $ 0.1000   $ 0.0875 $ 0.0750 $ 0.0750   $ 0.100     $ 0.088   $ 0.300 $ 0.238    
Remaining authorized repurchase amount                           $ 10,100,000         $ 10,100,000      
Stock Issued During Period, Shares, Employee Stock Purchase Plans                           14,734     15,706   46,622 59,020    
Employee Stock Purchase Plan Weighted Average Purchase Price Of Shares Purchased (in USD per share)                           $ 26.32     $ 18.96   $ 26.32 $ 15.60    
Additional authorized amount                           $ 50,000,000         $ 50,000,000      
Treasury Stock, Shares, Acquired                           1,203,493         1,528,197      
Treasury stock acquired                           $ 53,239,000         $ 65,540,000      
Treasury Stock Acquired, Average Cost Per Share                           $ 44.24         $ 42.89      
Shares settled (in shares)                           84,000         84,000      
Treasury stock settled                           $ 3,800,000         $ 3,800,000      
Share-based Payment Arrangement, Accelerated Cost                           $ 129,000                
Additional authorized amount                                         $ 25,000,000 $ 25,000,000
Subsequent Event                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Dividends declared per common share (in dollars per Share) $ 0.1125                                          
Remaining authorized repurchase amount $ 85,100,000                                          
Additional authorized amount $ 75,000,000                                          
Restricted Stock Units (RSUs) [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                           0     0   9,300 10,200    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period, Aggregate Grant Date Market Value                           $ 0     $ 0   $ 324,000 $ 255,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value                                     $ 34.79 $ 25.00    
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited                           0     0   966 0    
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation                           711     714   10,399 10,588    
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation                           $ 28,000     $ 16,000   $ 375,000 $ 250,000    
ESPP                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Dividend yield                                     0.01%      
Share-based compensation expense                           $ 117,000     95,000   $ 458,000 339,000    
Expected volatility                                     48.14%      
Risk-free interest rate                           0.10% 0.09% 0.09%            
Expected holding period (years)                           9 months 6 months 3 months            
ESPP | Forecast                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Risk-free interest rate                         0.10%                  
Expected holding period (years)                         1 year                  
Restricted Stock                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Share-based compensation expense                           $ 89,000     183,000   $ 308,000 551,000    
Stock options                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage                                     33.00%      
Share-based compensation expense                           467,000     165,000   $ 1,507,000 502,000    
Proceeds from Stock Options Exercised                           0     0   880,000 0    
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation                           $ 82,000     $ 31,000   $ 1,058,000 $ 31,000    
Stock options | Monte-Carlo Pricing Model                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                                     150,000      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Options, Grants in Period, Aggregate Grant Date Market Value                                     $ 1,700,000      
Share price at grant date                                     $ 34.79      
Performance awards                                            
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                 237,500         29,548     9,782 368,921 39,802 23,756    
Expected volatility   43.44% 42.85% 41.79% 41.17%                                  
Risk-free interest rate   0.49% 0.53% 0.46% 0.52%                                  
Expected holding period (years)   3 years 3 months 14 days 3 years 4 months 20 days 3 years 6 months 29 days 3 years 8 months 15 days                                  
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value                 $ 2,800,000         $ 1,062,000     $ 244,000   $ 1,464,000 $ 469,000    
Share price at grant date   $ 45.27 $ 39.48 $ 38.78 $ 35.83                                  
Director [Member]                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                           3,192     8,540   12,565 25,220    
Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value                           $ 142,000     $ 192,000   $ 480,000 $ 477,000    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value                           $ 44.59     $ 26.79   $ 38.20 $ 18.91    
Officers And Key Employees [Member]                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Directors compensation expense                           $ 475,000     $ 286,000   $ 1,064,000 $ 589,000    
Advsior                                            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross                           112     224   389 808    
Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value                           $ 5,000     $ 6,000   $ 15,000 $ 15,000