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Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2021	Sep. 30, 2020
Statement of Financial Position [Abstract]
Fair value of investment securities - held to maturity	$ 48,263	$ 30,899
Allowance for loan losses	$ 7,800	$ 6,400
Preferred stock; par value	$ 0.01	$ 0.01
Preferred stock; shares authorized	1,000,000	1,000,000
Preferred stock; shares issued	0	0
Common stock; par value	$ 0.01	$ 0.01
Common stock; shares authorized	8,000,000	8,000,000
Common stock; shares issued	5,923,742	5,923,742
Common stock, shares outstanding	5,810,746	5,810,746
Treasury stock, shares	112,996	112,996

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Face amount or stated value per share of common stock.

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