Regulatory Matters (Details) $ in Thousands	12 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)
Total capital to risk-weighted assets
Actual capital, Amount	$ 191,355	$ 132,554
Actual capital, Ratio	0.1632	0.1559
Minimum capital adequacy requirement, Amount	$ 93,796	$ 68,040
Minimum capital adequacy requirement, Ratio	0.0800	0.0800
Minimum capital adequacy requirement with capital conservation buffer, Amount	$ 123,107	$ 89,303
Minimum capital adequacy requirement with capital conservation buffer, Ratio	0.1050	0.1050
Minimum to be well capitalized under prompt corrective action provisions, Amount	$ 117,245	$ 85,050
Minimum to be well capitalized under prompt corrective action provisions, Ratio	0.1000	0.1000
Tier 1 capital to risk-weighted assets
Actual capital, Amount	$ 178,340	$ 123,666
Actual capital, Ratio	0.1521	0.1454
Minimum capital adequacy requirement, Amount	$ 70,347	$ 51,030
Minimum capital adequacy requirement, Ratio	0.0600	0.0600
Minimum capital adequacy requirement with capital conservation buffer, Amount	$ 99,658	$ 72,293
Minimum capital adequacy requirement with capital conservation buffer, Ratio	0.0850	0.0850
Minimum to be well capitalized under prompt corrective action provisions, Amount	$ 93,796	$ 68,040
Minimum to be well capitalized under prompt corrective action provisions, Ratio	0.0800	0.0800
Common equity tier 1 capital to risk-weighted assets
Actual capital, Amount	$ 178,340	$ 123,666
Actual capital, Ratio	0.1521	0.1454
Minimum capital adequacy requirement, Amount	$ 52,760	$ 38,273
Minimum capital adequacy requirement, Ratio	0.0450	0.0450
Minimum capital adequacy requirement with capital conservation buffer, Amount	$ 82,071	$ 59,535
Minimum capital adequacy requirement with capital conservation buffer, Ratio	0.0700	0.0700
Minimum to be well capitalized under prompt corrective action provisions, Amount	$ 76,209	$ 55,283
Minimum to be well capitalized under prompt corrective action provisions, Ratio	0.0650	0.0650
Tier 1 capital to average total assets
Actual capital, Amount	$ 178,340	$ 123,666
Actual capital, Ratio	0.1090	0.0945
Minimum capital adequacy requirement, Amount	$ 65,429	$ 52,338
Minimum capital adequacy requirement, Ratio	0.0400	0.0400
Minimum to be well capitalized under prompt corrective action provisions, Amount	$ 81,786	$ 65,423
Minimum to be well capitalized under prompt corrective action provisions, Ratio	0.0500	0.0500
Retained earnings available to pay dividends	$ 42,200
Cash dividends to the Holding Company	400
Capital contributions to the bank	$ 26,000