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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024		Dec. 31, 2023	Sep. 30, 2023
Held to Maturity
Amortized Cost	$ 156,105	$ 172,097	[1]
Gross Unrealized Gains	273	483
Gross Unrealized Losses	(8,669)	(6,573)
Estimated Fair Value	147,709	166,007
Allowance for Credit Losses	55	60		$ 82	$ 0
Available for Sale
Amortized Cost	78,082	72,231
Gross Unrealized Gains	55	551
Gross Unrealized Losses	(1,057)	(525)
Estimated Fair Value	77,080	72,257
U.S. Treasury and U.S. government agency securities
Held to Maturity
Amortized Cost	79,391	92,312
Gross Unrealized Gains	0	70
Gross Unrealized Losses	(4,916)	(4,197)
Estimated Fair Value	74,475	88,185
Allowance for Credit Losses	0	0
Available for Sale
Amortized Cost	9,569	3,934
Gross Unrealized Gains	0	6
Gross Unrealized Losses	(25)	(1)
Estimated Fair Value	9,544	3,939
U.S. government agencies
Held to Maturity
Amortized Cost	48,161	49,481
Gross Unrealized Gains	0	174
Gross Unrealized Losses	(2,324)	(1,378)
Estimated Fair Value	45,837	48,277
Allowance for Credit Losses	0	0
Available for Sale
Amortized Cost	68,513	68,297
Gross Unrealized Gains	55	545
Gross Unrealized Losses	(1,032)	(524)
Estimated Fair Value	67,536	68,318
Private label residential
Held to Maturity
Amortized Cost	26,833	28,479
Gross Unrealized Gains	264	231
Gross Unrealized Losses	(1,422)	(980)
Estimated Fair Value	25,675	27,730
Allowance for Credit Losses	52	55		73	0
Municipal securities
Held to Maturity
Amortized Cost	1,223	1,330
Gross Unrealized Gains	9	8
Gross Unrealized Losses	0	0
Estimated Fair Value	1,232	1,338
Allowance for Credit Losses	0	0
Bank issued trust preferred securities
Held to Maturity
Amortized Cost	497	495
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(7)	(18)
Estimated Fair Value	490	477
Allowance for Credit Losses	$ 3	$ 5		$ 9	$ 0
[1] Derived from audited consolidated financial statements.

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