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Stockholders' Equity (Narrative) (Details) - USD ($) |  |  |  |  |  |  |  |  |  |  |  |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |
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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 |  |

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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The risk-free interest rate assumption that is used in valuing an option on its own shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iv) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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