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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. + Details
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- 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. + Details
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- Definition 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. + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-5 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-12 + Details
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