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SECURITIES - Investment Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Sep. 30, 2021
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Available for sale [Abstract] |  |
Amortized cost | $ 5,114 | $ 7,422
Gross unrealized gains |  | 326
Gross unrealized losses | (44) | (1)
Fair value | 5,070 | 7,747
Held to maturity [Abstract] |  |
Amortized cost | 4,629 | 8,611
Gross unrealized gains | 1 | 258
Gross unrealized losses | (49) | (4)
Fair value | 4,581 | 8,865
Investment Securities [Abstract] |  |
Amortized cost | 9,743 | 16,033
Gross unrealized gains | 1 | 584
Gross unrealized losses | (93) | (5)
Fair value | 9,651 | 16,612
Gross unrealized losses in a continuous loss position for less than twelve months | 93 | 5
Investment securities pledged to secure public deposits | 1,700 | 5,100
U.S. GSE Securities | Residential Mortgage Backed Securities |  |
Available for sale [Abstract] |  |
Amortized cost | 414 | 722
Gross unrealized gains |  | 112
Gross unrealized losses | (4) | (1)
Fair value | 410 | 833
Held to maturity [Abstract] |  |
Amortized cost | 1,964 | 2,417
Gross unrealized gains |  | 74
Gross unrealized losses | (49) | 0
Fair value | 1,915 | 2,491
U.S. GSE Securities | Commercial Mortgage Backed Securities |  |
Held to maturity [Abstract] |  |
Amortized cost | 2,665 | 2,694
Gross unrealized gains | 1 | 175
Gross unrealized losses | 0 | 0
Fair value | 2,666 | 2,869
Corporate Bonds |  |
Available for sale [Abstract] |  |
Amortized cost | 4,700 | 6,700
Gross unrealized gains |  | 214
Gross unrealized losses | (40) | 0
Fair value | $ 4,660 | 6,914
Held to maturity [Abstract] |  |
Amortized cost |  | 3,500
Gross unrealized gains |  | 9
Gross unrealized losses |  | (4)
Fair value |  | $ 3,505

X
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