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INVESTMENT SECURITIES - Schedule of Amortized Cost and Fair Values of Securities Held to Maturity (Details) - Debt Securities [Member] - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Sep. 30, 2025 | Sep. 30, 2024
Securities available-for-sale: |  |
Amortized Cost, Securities available-for-sale | $ 21,915 | $ 16,747
Gross Unrealized Gains, Securities available-for-sale | 357 | 77
Gross Unrealized Losses, Securities available-for-sale | (1,090) | (1,208)
Allowance for Credit Losses, Securities available-for-sale |  |
Fair Value, Securities available-for-sale | 21,182 | 15,616
Securities held-to-maturity: |  |
Amortized Cost, Securities held-to-maturity | 67,266 | 79,816
Gross Unrealized Gains, Securities held-to-maturity | 40 | 84
Gross Unrealized Losses, Securities held-to-maturity | (6,146) | (7,283)
Allowance for Credit Losses, Securities held-to-maturity |  |
Fair Value, Securities held-to-maturity | 61,160 | 72,617
Amortized Cost, Total investment securities | 89,181 | 96,563
Gross Unrealized Gains, Total investment securities | 397 | 161
Gross Unrealized Losses, Total investment securities | (7,236) | (8,491)
Allowance for Credit Losses, Total investment securities |  |
Fair Value, Total investment securities | 82,342 | 88,233
Residential Mortgage-Backed Securities [Member] | Obligations of U.S. government agencies [Member] |  |
Securities available-for-sale: |  |
Amortized Cost, Securities available-for-sale | 90 |
Gross Unrealized Gains, Securities available-for-sale |  |
Gross Unrealized Losses, Securities available-for-sale | (8) |
Allowance for Credit Losses, Securities available-for-sale |  |
Fair Value, Securities available-for-sale | 82 |
Residential Mortgage-Backed Securities [Member] | Obligations of U.S. government-sponsored enterprises [Member] |  |
Securities available-for-sale: |  |
Amortized Cost, Securities available-for-sale | 15,325 |
Gross Unrealized Gains, Securities available-for-sale | 70 |
Gross Unrealized Losses, Securities available-for-sale | (1,082) |
Allowance for Credit Losses, Securities available-for-sale |  |
Fair Value, Securities available-for-sale | 14,313 |
Securities held-to-maturity: |  |
Amortized Cost, Securities held-to-maturity | 40,741 | 42,701
Gross Unrealized Gains, Securities held-to-maturity | 4 | 4
Gross Unrealized Losses, Securities held-to-maturity | (4,679) | (5,194)
Allowance for Credit Losses, Securities held-to-maturity |  |
Fair Value, Securities held-to-maturity | 36,066 | 37,511
Corporate securities [Member] | Obligations of U.S. government agencies [Member] |  |
Securities available-for-sale: |  |
Amortized Cost, Securities available-for-sale |  | 4,000
Gross Unrealized Gains, Securities available-for-sale |  | 21
Gross Unrealized Losses, Securities available-for-sale |  |
Allowance for Credit Losses, Securities available-for-sale |  |
Fair Value, Securities available-for-sale |  | 4,021
Corporate securities [Member] | Obligations of U.S. government-sponsored enterprises [Member] |  |
Securities available-for-sale: |  |
Amortized Cost, Securities available-for-sale | 6,500 |
Gross Unrealized Gains, Securities available-for-sale | 287 |
Gross Unrealized Losses, Securities available-for-sale |  |
Allowance for Credit Losses, Securities available-for-sale |  |
Fair Value, Securities available-for-sale | 6,787 |
Securities held-to-maturity: |  |
Amortized Cost, Securities held-to-maturity | 3,000 | 3,000
Gross Unrealized Gains, Securities held-to-maturity |  |
Gross Unrealized Losses, Securities held-to-maturity | (86) | (234)
Allowance for Credit Losses, Securities held-to-maturity |  |
Fair Value, Securities held-to-maturity | 2,914 | 2,766
Mortgage-backed securities - residential [Member] | Obligations of U.S. government agencies [Member] |  |
Securities available-for-sale: |  |
Amortized Cost, Securities available-for-sale |  | 95
Gross Unrealized Gains, Securities available-for-sale |  |
Gross Unrealized Losses, Securities available-for-sale |  | (6)
Allowance for Credit Losses, Securities available-for-sale |  |
Fair Value, Securities available-for-sale |  | 89
Securities held-to-maturity: |  |
Amortized Cost, Securities held-to-maturity | 6,558 | 7,209
Gross Unrealized Gains, Securities held-to-maturity |  |
Gross Unrealized Losses, Securities held-to-maturity | (629) | (611)
Allowance for Credit Losses, Securities held-to-maturity |  |
Fair Value, Securities held-to-maturity | 5,929 | 6,598
Commercial Mortgage-Backed Securities [Member] | Obligations of U.S. government agencies [Member] |  |
Securities available-for-sale: |  |
Amortized Cost, Securities available-for-sale |  | 12,652
Gross Unrealized Gains, Securities available-for-sale |  | 56
Gross Unrealized Losses, Securities available-for-sale |  | (1,202)
Allowance for Credit Losses, Securities available-for-sale |  |
Fair Value, Securities available-for-sale |  | 11,506
Securities held-to-maturity: |  |
Amortized Cost, Securities held-to-maturity | 3,913 | 4,268
Gross Unrealized Gains, Securities held-to-maturity | 19 | 64
Gross Unrealized Losses, Securities held-to-maturity | (17) | (23)
Allowance for Credit Losses, Securities held-to-maturity |  |
Fair Value, Securities held-to-maturity | 3,915 | 4,309
Debt Securities [Member] | Obligations of U.S. government-sponsored enterprises [Member] |  |
Securities held-to-maturity: |  |
Amortized Cost, Securities held-to-maturity | 9,449 | 19,000
Gross Unrealized Gains, Securities held-to-maturity | 12 | 13
Gross Unrealized Losses, Securities held-to-maturity | (455) | (865)
Allowance for Credit Losses, Securities held-to-maturity |  |
Fair Value, Securities held-to-maturity | 9,006 | 18,148
Private label mortgage-backed securities residential [Member] | Obligations of U.S. government-sponsored enterprises [Member] |  |
Securities held-to-maturity: |  |
Amortized Cost, Securities held-to-maturity | 174 | 190
Gross Unrealized Gains, Securities held-to-maturity |  |
Gross Unrealized Losses, Securities held-to-maturity | (2) | (5)
Allowance for Credit Losses, Securities held-to-maturity |  |
Fair Value, Securities held-to-maturity | 172 | 185
ObligationsOfStateAndPoliticalSubdivisionsMember | Obligations of U.S. government-sponsored enterprises [Member] |  |
Securities held-to-maturity: |  |
Amortized Cost, Securities held-to-maturity | 3,431 | 3,448
Gross Unrealized Gains, Securities held-to-maturity | 5 | 3
Gross Unrealized Losses, Securities held-to-maturity | (278) | (351)
Allowance for Credit Losses, Securities held-to-maturity |  |
Fair Value, Securities held-to-maturity | $ 3,158 | $ 3,100

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