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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023
Held to Maturity
Amortized Cost	$ 176,787		$ 270,218	[1]
Gross Unrealized Gains	240		295
Gross Unrealized Losses	(10,266)		(16,747)
Estimated Fair Value	166,761		253,766
Allowance for Credit Losses ("ACL")	72	$ 85	0
Available for Sale
Amortized Cost	75,204		43,132
Gross Unrealized Gains	137		0
Gross Unrealized Losses	(826)		(1,361)
Estimated Fair Value	74,515		41,771
U.S. Treasury and U.S. government agency securities
Held to Maturity
Amortized Cost	92,233		171,626
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(6,349)		(10,088)
Estimated Fair Value	85,884		161,538
Allowance for Credit Losses ("ACL")	0
Available for Sale
Amortized Cost	8,924
Gross Unrealized Gains	0
Gross Unrealized Losses	(14)
Estimated Fair Value	8,910
U.S. government agencies
Held to Maturity
Amortized Cost	50,727		52,294
Gross Unrealized Gains	2		0
Gross Unrealized Losses	(2,440)		(3,950)
Estimated Fair Value	48,289		48,344
Allowance for Credit Losses ("ACL")	0
Available for Sale
Amortized Cost	66,280		43,132
Gross Unrealized Gains	137		0
Gross Unrealized Losses	(812)		(1,361)
Estimated Fair Value	65,605		41,771
Private label residential
Held to Maturity
Amortized Cost	31,996		44,011
Gross Unrealized Gains	238		295
Gross Unrealized Losses	(1,438)		(2,611)
Estimated Fair Value	30,796		41,695
Allowance for Credit Losses ("ACL")	66	77	0
Municipal securities
Held to Maturity
Amortized Cost	1,337		1,787
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(10)		(47)
Estimated Fair Value	1,327		1,740
Allowance for Credit Losses ("ACL")	0
Bank issued trust preferred securities
Held to Maturity
Amortized Cost	494		500
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(29)		(51)
Estimated Fair Value	465		449
Allowance for Credit Losses ("ACL")	$ 6	$ 8	$ 0
[1] Derived from audited consolidated financial statements.

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