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Stockholders' Equity (Narrative) (Details) - USD ($) |  |  |  |  |  |  |  |  |  | 3 Months Ended | 9 Months Ended
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Jul. 25, 2023 | Jul. 05, 2023 | Jun. 21, 2023 | Jun. 01, 2023 | Mar. 01, 2023 | Jun. 03, 2022 | Mar. 01, 2022 | Sep. 01, 2020 | Sep. 01, 2019 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 23.98 |
Directors compensation expense |  |  |  |  |  |  |  |  |  |  | $ 250,000 |  |  | $ 167,000 | $ 605,000 | $ 552,000
Dividends declared per common share (in dollars per Share) |  |  |  | $ 0.1125 | $ 0.1125 | $ 0.1125 | $ 0.1125 | $ 0.1125 | $ 0.1125 |  | $ 0.1125 |  |  | $ 0.1125 | $ 0.3375 | $ 0.3375
Issuance of common stock from employee stock purchase plan, shares |  |  |  |  |  |  |  |  |  |  | 11,782 |  |  | 13,795 | 49,824 | 38,884
Employee Stock Purchase Plan Weighted Average Purchase Price Of Shares Purchased (in USD per share) |  |  |  |  |  |  |  |  |  |  | $ 24.01 |  |  | $ 27.34 | $ 24.21 | $ 35.42
Treasury stock acquired, shares |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 | 0 | 695,496
Treasury Stock, Value, Acquired, Cost Method |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 0 | $ 0 | $ 34,234,000
Treasury Stock Acquired, Average Cost Per Share |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 0 | $ 0 | $ 49.22
Remaining authorized repurchase amount |  |  |  |  |  |  |  |  |  |  | $ 48,900,000 |  |  |  | $ 48,900,000 |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 142,020 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period, Aggregate Grant Date Market Value |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 0 | $ 4,634,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 32.63 |
Stock Issued During Period, Shares, Restricted Stock Award, Forfeited |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 500 | 1,826 | 1,950
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 | 1,473 | 4,136
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 0 | $ 50,000 | $ 205,000
ESPP |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend yield |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.30% |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  | $ 74,000 |  |  | 120,000 | $ 489,000 | 471,000
Expected volatility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 53.51% |
Risk-free interest rate |  |  |  |  |  |  |  |  |  |  | 4.75% | 4.77% | 4.53% |  |  |
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 |  |  |  |  |  |  |  |  |  | 4.72% |  |  |  |  |  |
Expected holding period (years) |  |  |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  | $ 400,000 |  |  | 36,000 | $ 972,000 | 133,000
Stock options |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend yield |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1.38% |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.00% |
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  | 735,000 |  |  | 559,000 | $ 2,180,000 | 1,747,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 214,191 |
Expected volatility |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 43.68% |
Risk-free interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.27% |
Expected holding period (years) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 years |
Proceeds from Stock Options Exercised |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 | $ 0 | 60,000
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  |  |  |  |  |  |  |  |  | $ 133,000 |  |  | $ 0 | $ 174,000 | $ 82,000
Stock options | Monte-Carlo Pricing Model |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price at grant date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 32.69 |
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 |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 | 0 | 27,013
Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Granted In Period, Fair Value |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 0 | $ 0 | $ 1,262,000
Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 30,000 | 0
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other Than Options, Grants in Period, Aggregate Grant Date Market Value |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 0 | $ 826,000 | $ 0
Share-based compensation expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 826,000 |
Share price at grant date |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 27.54 |
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation |  |  |  |  |  |  |  |  |  |  | 0 |  |  | 0 | 1,001 | 0
Share-based Payment Arrangement, Decrease for Tax Withholding Obligation |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  | $ 0 | $ 28,000 | $ 0
Director |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 | 743 | 769 |  |  |  |  |  |  |  |  | 3,747 |  |  | 2,214 | 8,342 | 7,255
Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value |  |  | $ 25,000 |  |  |  |  |  |  |  | $ 106,000 |  |  | $ 71,000 | $ 248,000 | $ 307,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  | $ 28.25 |  |  | $ 32.16 | $ 29.78 | $ 42.20
Advisor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  | 176 |  |  | 155 | 492 | 374
Share Based Compensation Arrangement By Share Based Payment Award, Options, Aggregate Grant Date Fair Value |  |  |  |  |  |  |  |  |  |  | $ 5,000 |  |  | $ 5,000 | $ 15,000 | $ 15,000
Officers and Key Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Directors compensation expense |  |  |  |  |  |  |  |  |  |  | $ 622,000 |  |  | $ 701,000 | $ 1,350,000 | $ 1,904,000

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