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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2021
Held to maturity
Amortized Cost	$ 189,405	$ 69,102
Gross Unrealized Gains	512	1,251
Gross Unrealized Losses	(5,210)	(244)
Estimated Fair Value	184,707	70,109
Available for sale
Total	50,745
Estimated Fair Value	51,526	64,131
Mortgage-backed Securities, U.S. government agencies
Held to maturity
Amortized Cost	21,858	25,913
Gross Unrealized Gains	215	936
Gross Unrealized Losses	(508)	(122)
Estimated Fair Value	21,565	26,727
Available for sale
Total	50,745	63,080
Gross Unrealized Gains	105	210
Gross Unrealized Losses	(226)	(114)
Estimated Fair Value	50,624	63,176
Mortgage-backed Securities, Private label residential
Held to maturity
Amortized Cost	25,120	13,929
Gross Unrealized Gains	273	302
Gross Unrealized Losses	(542)	(23)
Estimated Fair Value	24,851	14,208
Private label residential
Held to maturity
Amortized Cost	141,927	28,760
Gross Unrealized Gains	24	8
Gross Unrealized Losses	(4,150)	(99)
Estimated Fair Value	137,801	28,669
Bank issued trust preferred securities
Held to maturity
Amortized Cost	500	500
Gross Unrealized Gains	0	5
Gross Unrealized Losses	(10)	0
Estimated Fair Value	$ 490	$ 505

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