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