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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Held to maturity
Amortized Cost	$ 114,600	$ 69,102
Gross Unrealized Gains	1,170	1,251
Gross Unrealized Losses	(571)	(244)
Estimated Fair Value	115,199	70,109
Available for sale
Total	56,481
Estimated Fair Value	57,498	64,131
Mortgage-backed Securities, U.S. government agencies
Held to maturity
Amortized Cost	23,550	25,913
Gross Unrealized Gains	781	936
Gross Unrealized Losses	(192)	(122)
Estimated Fair Value	24,139	26,727
Available for sale
Total	56,481	63,080
Gross Unrealized Gains	180	210
Gross Unrealized Losses	(109)	(114)
Estimated Fair Value	56,552	63,176
Mortgage-backed Securities, Private label residential
Held to maturity
Amortized Cost	23,355	13,929
Gross Unrealized Gains	292	302
Gross Unrealized Losses	(94)	(23)
Estimated Fair Value	23,553	14,208
Private label residential
Held to maturity
Amortized Cost	67,195	28,760
Gross Unrealized Gains	95	8
Gross Unrealized Losses	(285)	(99)
Estimated Fair Value	67,005	28,669
Bank issued trust preferred securities
Held to maturity
Amortized Cost	500	500
Gross Unrealized Gains	2	5
Gross Unrealized Losses	0	0
Estimated Fair Value	$ 502	$ 505

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