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Investment Securities - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024
Debt Securities, Available-for-Sale [Line Items]
Unrealized loss position	$ 9,365,000		$ 10,414,000
Unrealized Holding Losses 12 Months or More, Unrealized Losses	9,365,000		10,413,000
Unrealized Holding Losses Less Than 12 Months, Unrealized Losses	1,000		1,000
Investment securities - held to maturity, allowance for credit losses	0		0	$ 0	$ 0
Impairment loss on held to maturity securities	0		0
Impairment loss on available for sale securities	0		$ 0
U.S. government sponsored enterprise MBS
Debt Securities, Available-for-Sale [Line Items]
Principal payments from investment securities held to maturity	5,500,000	$ 5,700,000
Proceeds from sale of investment securities available for sale	0	$ 0
U.S. Government sponsored enterprise securities
Debt Securities, Available-for-Sale [Line Items]
Allowance for credit losses on investment securities	$ 0

X

- Definition

Amount of accumulated unrealized loss on investment in debt security measured at fair value held to maturity with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer.

+ References

No definition available.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value held to maturity with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer.

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No definition available.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value and held to maturity with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position.

+ References

No definition available.

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Amount of impairment loss during the year on investment in debt securities available for sale.

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Amount of impairment loss during the year on investment in debt securities held to maturity.

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Amount of allowance for credit loss on 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 other comprehensive income (available-for-sale).

+ References

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Amount, excluding accrued interest, of allowance for credit loss on investment in debt security measured at amortized cost (held-to-maturity).

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The cash inflow from the maturity (principal due), prepayment and call (request of early payment) of a loan financed by home mortgage payments classified as held to maturity.

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Amount of cash inflow from sale of investment in mortgage-backed security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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