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UNREALIZED LOSSES ON INVESTMENT SECURITIES AVAILABLE-FOR-SALE (Tables) | 6 Months Ended
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Mar. 31, 2026
Unrealized Losses on Investment Securities Available-for-Sale [Abstract] |
Schedule of Available-for-Sale Securities with Unrealized Losses | Details of available-for-sale securities with unrealized losses at March 31, 2026 and September 30, 2025 are summarized in the following tables:
|  |  |  |  | Less Than 12 Months |  |  | 12 Months Or Greater |  |  | Total |
|  | Number of |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Securities |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  |  |  |  | (Dollars in thousands) |
March 31, 2026 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of U.S. government agencies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities - residential |  |  | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 78 |  |  | $ | (8 | ) |  | $ | 78 |  |  | $ | (8 | )
Obligations of U.S. government-sponsored enterprises |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities - residential |  |  | 10 |  |  |  | 5,948 |  |  |  | (34 | ) |  |  | 6,481 |  |  |  | (973 | ) |  |  | 12,429 |  |  |  | (1,007 | )
Total |  |  | 11 |  |  | $ | 5,948 |  |  | $ | (34 | ) |  | $ | 6,559 |  |  | $ | (981 | ) |  | $ | 12,507 |  |  | $ | (1,015 | )
|  |  |  |  | Less Than 12 Months |  |  | 12 Months Or Greater |  |  | Total |
|  | Number of |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Securities |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
|  |  |  |  | (Dollars in thousands) |
September 30, 2025 |  |  |  |  |  |
Securities available-for-sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of U.S. government agencies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities - residential |  |  | 1 |  |  | $ | — |  |  | $ | — |  |  | $ | 82 |  |  | $ | (8 | ) |  | $ | 82 |  |  | $ | (8 | )
Obligations of U.S. government-sponsored enterprises |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities - residential |  |  | 7 |  |  |  | — |  |  |  | — |  |  |  | 6,728 |  |  |  | (1,082 | ) |  |  | 6,728 |  |  |  | (1,082 | )
Total |  |  | 8 |  |  | $ | — |  |  | $ | — |  |  | $ | 6,810 |  |  | $ | (1,090 | ) |  | $ | 6,810 |  |  | $ | (1,090 | )

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