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SECURITIES - Securities Portfolio Presented by Contractual Maturity (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Mar. 31, 2022 | Mar. 31, 2021 | Sep. 30, 2021
Securities Available for Sale, Amortized Cost [Abstract] |  |  |  |  |
Five to ten years | $ 4,700 |  | $ 4,700 |  |
Amortized cost | 5,114 |  | 5,114 |  | $ 7,422
Securities Available for Sale, Fair Value [Abstract] |  |  |  |  |
Five to ten years | 4,660 |  | 4,660 |  |
Fair value | 5,070 |  | 5,070 |  | 7,747
Securities Held to Maturity, Amortized Cost [Abstract] |  |  |  |  |
One to five years | 0 |  | 0 |  |
Five to ten years | 0 |  | 0 |  |
Amortized cost | 4,629 |  | 4,629 |  | 8,611
Securities Held to Maturity, Fair Value [Abstract] |  |  |  |  |
One to five years | 0 |  | 0 |  |
Five to ten years | 0 |  | 0 |  |
Fair value | 4,581 |  | 4,581 |  | 8,865
Debt Securities, Available-for-Sale and Held-to-Maturity, after Allowance for Credit Loss [Abstract] |  |  |  |  |
Amortized cost | 9,743 |  | 9,743 |  | 16,033
Fair value | 9,651 |  | 9,651 |  | 16,612
Proceeds from sales | 2,100 | $ 3,200 | 2,105 | $ 3,240 |
Gain on sale of securities available for sale | 105 | $ 240 | 105 | $ 240 |
U.S. GSE Securities | Residential Mortgage Backed Securities |  |  |  |  |
Securities Available for Sale, Amortized Cost [Abstract] |  |  |  |  |
Without single maturity date | 414 |  | 414 |  |
Amortized cost | 414 |  | 414 |  | 722
Securities Available for Sale, Fair Value [Abstract] |  |  |  |  |
Without single maturity date | 410 |  | 410 |  |
Fair value | 410 |  | 410 |  | 833
Securities Held to Maturity, Amortized Cost [Abstract] |  |  |  |  |
Without single maturity date | 1,964 |  | 1,964 |  |
Amortized cost | 1,964 |  | 1,964 |  | 2,417
Securities Held to Maturity, Fair Value [Abstract] |  |  |  |  |
Without single maturity date | 1,915 |  | 1,915 |  |
Fair value | 1,915 |  | 1,915 |  | 2,491
U.S. GSE Securities | Commercial Mortgage Backed Securities |  |  |  |  |
Securities Held to Maturity, Amortized Cost [Abstract] |  |  |  |  |
Without single maturity date | 2,665 |  | 2,665 |  |
Amortized cost | 2,665 |  | 2,665 |  | 2,694
Securities Held to Maturity, Fair Value [Abstract] |  |  |  |  |
Without single maturity date | 2,666 |  | 2,666 |  |
Fair value | $ 2,666 |  | $ 2,666 |  | $ 2,869

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