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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023
Held to Maturity
Amortized Cost	$ 266,085	$ 270,218	[1]
Gross Unrealized Gains	359	295
Gross Unrealized Losses	(12,083)	(16,747)
Estimated Fair Value	254,361	253,766
Allowance for Credit Losses ("ACL")	82	0
Available for Sale
Amortized Cost	41,492	43,132
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,046)	(1,361)
Estimated Fair Value	40,446	41,771
U.S. Treasury and U.S. government agency securities
Held to Maturity
Amortized Cost	169,869	171,626
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(7,468)	(10,088)
Estimated Fair Value	162,401	161,538
Allowance for Credit Losses ("ACL")	0
U.S. government agencies
Held to Maturity
Amortized Cost	53,185	52,294
Gross Unrealized Gains	3	0
Gross Unrealized Losses	(2,604)	(3,950)
Estimated Fair Value	50,584	48,344
Allowance for Credit Losses ("ACL")	0
Available for Sale
Amortized Cost	41,492	43,132
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,046)	(1,361)
Estimated Fair Value	40,446	41,771
Private label residential
Held to Maturity
Amortized Cost	40,662	44,011
Gross Unrealized Gains	356	295
Gross Unrealized Losses	(1,934)	(2,611)
Estimated Fair Value	39,084	41,695
Allowance for Credit Losses ("ACL")	73	0
Municipal securities
Held to Maturity
Amortized Cost	1,878	1,787
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(30)	(47)
Estimated Fair Value	1,848	1,740
Allowance for Credit Losses ("ACL")	0
Bank issued trust preferred securities
Held to Maturity
Amortized Cost	491	500
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(47)	(51)
Estimated Fair Value	444	449
Allowance for Credit Losses ("ACL")	$ 9	$ 0
[1] Derived from audited consolidated financial statements.

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