INVESTMENT SECURITIES - Schedule of Amortized Cost and Fair Values of Securities Held to Maturity (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
Mar. 31, 2026	Sep. 30, 2025
Securities available-for-sale:
Securities Available-For-Sale, Amortized Cost	$ 25,220
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost	68,105	$ 67,266
Total investment securities, Fair Value	24,265
Debt Securities [Member]
Securities available-for-sale:
Securities Available-For-Sale, Amortized Cost	31,720	21,915
Securities Available-For-Sale, Gross Unrealized Gains	351	357
Securities Available-For-Sale, Gross Unrealized Losses	(1,015)	(1,090)
Securities Available-For-Sale, Allowance for Credit Losses
Securities Available-For-Sale, Fair Value	31,056	21,182
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost	68,105	67,266
Securities held-to-maturity, Gross Unrealized Gains	36	40
Securities held-to-maturity, Gross Unrealized Losses	(5,971)	(6,146)
Securities held-to-maturity, Allowance for Credit Losses
Total securities held-to-maturity	62,170	61,160
Total investment securities, Amortized Cost	99,825	89,181
Total investment securities, Gross Unrealized Gains	387	397
Total investment securities, Gross Unrealized Losses	(6,986)	(7,236)
Total investment securities, Allowance for Credit Losses
Total investment securities, Fair Value	93,226	82,342
Debt Securities [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost	9,459	9,449
Securities held-to-maturity, Gross Unrealized Gains	1	12
Securities held-to-maturity, Gross Unrealized Losses	(387)	(455)
Securities held-to-maturity, Allowance for Credit Losses
Total securities held-to-maturity	9,073	9,006
Debt Securities [Member] \| Mortgage backed securities - residential [Member] \| Obligations of U.S. government agencies [Member]
Securities available-for-sale:
Securities Available-For-Sale, Amortized Cost	6,031	90
Securities Available-For-Sale, Gross Unrealized Gains
Securities Available-For-Sale, Gross Unrealized Losses	(8)	(8)
Securities Available-For-Sale, Allowance for Credit Losses
Securities Available-For-Sale, Fair Value	6,027	82
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost	7,715	6,558
Securities held-to-maturity, Gross Unrealized Gains
Securities held-to-maturity, Gross Unrealized Losses	(712)	(629)
Securities held-to-maturity, Allowance for Credit Losses
Total securities held-to-maturity	7,003	5,929
Debt Securities [Member] \| Mortgage backed securities - residential [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities available-for-sale:
Securities Available-For-Sale, Amortized Cost	19,189	15,325
Securities Available-For-Sale, Gross Unrealized Gains	56	70
Securities Available-For-Sale, Gross Unrealized Losses	(1,007)	(1,082)
Securities Available-For-Sale, Allowance for Credit Losses
Securities Available-For-Sale, Fair Value	18,238	14,313
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost	40,780	40,741
Securities held-to-maturity, Gross Unrealized Gains	0	4
Securities held-to-maturity, Gross Unrealized Losses	(4,514)	(4,679)
Securities held-to-maturity, Allowance for Credit Losses
Total securities held-to-maturity	36,266	36,066
Debt Securities [Member] \| Corporate securities [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities available-for-sale:
Securities Available-For-Sale, Amortized Cost	6,500	6,500
Securities Available-For-Sale, Gross Unrealized Gains	291	287
Securities Available-For-Sale, Gross Unrealized Losses
Securities Available-For-Sale, Allowance for Credit Losses
Securities Available-For-Sale, Fair Value	6,791	6,787
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost	3,000	3,000
Securities held-to-maturity, Gross Unrealized Gains
Securities held-to-maturity, Gross Unrealized Losses	(54)	(86)
Securities held-to-maturity, Allowance for Credit Losses
Total securities held-to-maturity	2,946	2,914
Debt Securities [Member] \| Mortgage-backed securities - commercial [Member] \| Obligations of U.S. government agencies [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost	3,649	3,913
Securities held-to-maturity, Gross Unrealized Gains	34	19
Securities held-to-maturity, Gross Unrealized Losses	(8)	(17)
Securities held-to-maturity, Allowance for Credit Losses
Total securities held-to-maturity	3,675	3,915
Debt Securities [Member] \| Private label mortgage-backed securities residential [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost	80	174
Securities held-to-maturity, Gross Unrealized Gains
Securities held-to-maturity, Gross Unrealized Losses	(1)	(2)
Securities held-to-maturity, Allowance for Credit Losses
Total securities held-to-maturity	79	172
Debt Securities [Member] \| Obligations of state and political subdivisions [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost	3,422	3,431
Securities held-to-maturity, Gross Unrealized Gains	1	5
Securities held-to-maturity, Gross Unrealized Losses	(295)	(278)
Securities held-to-maturity, Allowance for Credit Losses
Total securities held-to-maturity	3,128	3,158
Standard & Poor's, AAA/AA/A Rating [Member] \| Mortgage backed securities - residential [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost		40,741
Standard & Poor's, AAA/AA/A Rating [Member] \| Mortgage backed securities - residential [Member] \| Obligations of U.S. government agencies [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost	7,715	6,558
Standard & Poor's, AAA/AA/A Rating [Member] \| Mortgage backed securities - residential [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost	40,780
Standard & Poor's, AAA/AA/A Rating [Member] \| Corporate securities [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Standard & Poor's, AAA/AA/A Rating [Member] \| Corporate securities [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Standard & Poor's, AAA/AA/A Rating [Member] \| Mortgage-backed securities - commercial [Member] \| Obligations of U.S. government agencies [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost	3,649	3,913
Standard & Poor's, AAA/AA/A Rating [Member] \| Private label mortgage-backed securities residential [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost		174
Standard & Poor's, AAA/AA/A Rating [Member] \| Private label mortgage-backed securities residential [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost	80
Standard & Poor's, AAA/AA/A Rating [Member] \| Obligations of state and political subdivisions [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost		3,431
Standard & Poor's, AAA/AA/A Rating [Member] \| Obligations of state and political subdivisions [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost	3,422
Standard & Poor's, AAA/AA/A Rating [Member] \| Debt Securities [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost	65,105	64,266
Standard & Poor's, AAA/AA/A Rating [Member] \| Debt Securities [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost	9,459	9,449
Standard & Poor's, BBB/BB/B Rating [Member] \| Mortgage backed securities - residential [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Standard & Poor's, BBB/BB/B Rating [Member] \| Mortgage backed securities - residential [Member] \| Obligations of U.S. government agencies [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Standard & Poor's, BBB/BB/B Rating [Member] \| Mortgage backed securities - residential [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Standard & Poor's, BBB/BB/B Rating [Member] \| Corporate securities [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost		3,000
Standard & Poor's, BBB/BB/B Rating [Member] \| Corporate securities [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost	3,000
Standard & Poor's, BBB/BB/B Rating [Member] \| Mortgage-backed securities - commercial [Member] \| Obligations of U.S. government agencies [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Standard & Poor's, BBB/BB/B Rating [Member] \| Private label mortgage-backed securities residential [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Standard & Poor's, BBB/BB/B Rating [Member] \| Private label mortgage-backed securities residential [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Standard & Poor's, BBB/BB/B Rating [Member] \| Obligations of state and political subdivisions [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Standard & Poor's, BBB/BB/B Rating [Member] \| Obligations of state and political subdivisions [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Standard & Poor's, BBB/BB/B Rating [Member] \| Debt Securities [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost	3,000	3,000
Standard & Poor's, BBB/BB/B Rating [Member] \| Debt Securities [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Non-rated [Member] \| Mortgage backed securities - residential [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Non-rated [Member] \| Mortgage backed securities - residential [Member] \| Obligations of U.S. government agencies [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Non-rated [Member] \| Mortgage backed securities - residential [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Non-rated [Member] \| Corporate securities [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Non-rated [Member] \| Corporate securities [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Non-rated [Member] \| Mortgage-backed securities - commercial [Member] \| Obligations of U.S. government agencies [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Non-rated [Member] \| Private label mortgage-backed securities residential [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Non-rated [Member] \| Private label mortgage-backed securities residential [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Non-rated [Member] \| Obligations of state and political subdivisions [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Non-rated [Member] \| Obligations of state and political subdivisions [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Non-rated [Member] \| Debt Securities [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost
Non-rated [Member] \| Debt Securities [Member] \| Obligations of U.S. government-sponsored enterprises [Member]
Securities held-to-maturity:
Securities held-to-maturity, Amortized Cost

Gross unrealized losses.

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Gross unrealized losses.

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Securities available-for-sale, fair value.

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Amount of securities held-to-maturity.

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Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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