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SECURITIES - Investment Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
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

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