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IMPAIRMENT OF INVESTMENT SECURITIES (Tables) | 9 Months Ended
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Jun. 30, 2023
Impairment of Investment Securities [Abstract] |
Schedule of Investment Securities with Fair Values Greater Than Their Amortized Cost Contain Unrealized Gains | Investment securities with fair values less than their amortized cost contain unrealized losses
|  |  |  |  | Less Than 12 Months |  |  | 12 Months Or Greater |  |  | Total |
|  | Number of |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Securities |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |  |  | Value |  |  | Losses |
June 30, 2023 |  |  |  |  | (Dollars in thousands) |
Obligations of U.S. government agencies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities - residential |  |  | 6 |  |  | $ | — |  |  | $ | — |  |  | $ | 4,567 |  |  | $ | (740 | ) |  | $ | 4,567 |  |  | $ | (740 | )
Mortgage-backed securities - commercial |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | 582 |  |  |  | (2 | ) |  |  | 582 |  |  |  | (2 | )
Obligations of U.S. government-sponsored enterprises |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities - residential |  |  | 50 |  |  |  | 442 |  |  |  | (18 | ) |  |  | 47,521 |  |  |  | (8,737 | ) |  |  | 47,963 |  |  |  | (8,755 | )
Debt securities |  |  | 14 |  |  |  | — |  |  |  | — |  |  |  | 22,881 |  |  |  | (1,954 | ) |  |  | 22,881 |  |  |  | (1,954 | )
Private label mortgage-backed securities residential |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | 200 |  |  |  | (11 | ) |  |  | 200 |  |  |  | (11 | )
Obligations of state and political subdivisions |  |  | 6 |  |  |  | 522 |  |  |  | (6 | ) |  |  | 2,245 |  |  |  | (392 | ) |  |  | 2,767 |  |  |  | (398 | )
Corporate securities |  |  | 1 |  |  |  | — |  |  |  | — |  |  |  | 2,804 |  |  |  | (197 | ) |  |  | 2,804 |  |  |  | (197 | )
Total |  |  | 79 |  |  | $ | 964 |  |  | $ | (24 | ) |  | $ | 80,800 |  |  | $ | (12,033 | ) |  | $ | 81,764 |  |  | $ | (12,057 | )
September 30, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations of U.S. government agencies: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities - residential |  |  | 6 |  |  | $ | 2,364 |  |  | $ | (140 | ) |  | $ | 2,551 |  |  | $ | (588 | ) |  | $ | 4,915 |  |  | $ | (728 | )
Mortgage-backed securities - commercial |  |  | 1 |  |  |  | 631 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 631 |  |  |  | — |
Obligations of U.S. government-sponsored enterprises |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage-backed securities - residential |  |  | 49 |  |  |  | 21,180 |  |  |  | (2,795 | ) |  |  | 29,088 |  |  |  | (6,660 | ) |  |  | 50,268 |  |  |  | (9,455 | )
Debt securities |  |  | 14 |  |  |  | 11,664 |  |  |  | (660 | ) |  |  | 10,763 |  |  |  | (1,735 | ) |  |  | 22,427 |  |  |  | (2,395 | )
Private label mortgage-backed securities residential |  |  | 1 |  |  |  | 215 |  |  |  | (10 | ) |  |  | — |  |  |  | — |  |  |  | 215 |  |  |  | (10 | )
Obligations of state and political subdivisions |  |  | 7 |  |  |  | 1,268 |  |  |  | (181 | ) |  |  | 1,577 |  |  |  | (457 | ) |  |  | 2,845 |  |  |  | (638 | )
Corporate securities |  |  | 2 |  |  |  | 2,646 |  |  |  | (353 | ) |  |  | 4,917 |  |  |  | (83 | ) |  |  | 7,563 |  |  |  | (436 | )
Total |  |  | 80 |  |  | $ | 39,968 |  |  | $ | (4,139 | ) |  | $ | 48,896 |  |  | $ | (9,523 | ) |  | $ | 88,864 |  |  | $ | (13,662 | )

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-6 + Details
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