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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Sep. 30, 2024		Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023
Held to Maturity
Amortized Cost	$ 141,570		$ 172,097	[1]
Gross Unrealized Gains	221		483
Gross Unrealized Losses	(6,169)		(6,573)
Estimated Fair Value	135,622		166,007
Allowance for Credit Losses	46	$ 50	60		$ 72	$ 85	$ 0
Available for Sale
Amortized Cost	87,456		72,231
Gross Unrealized Gains	205		551
Gross Unrealized Losses	(1,186)		(525)
Estimated Fair Value	86,475		72,257
U.S. Treasury and U.S. government agency securities
Held to Maturity
Amortized Cost	69,559		92,312
Gross Unrealized Gains	0		70
Gross Unrealized Losses	(3,478)		(4,197)
Estimated Fair Value	66,081		88,185
Allowance for Credit Losses	0		0
Available for Sale
Amortized Cost	14,888		3,934
Gross Unrealized Gains	0		6
Gross Unrealized Losses	(22)		(1)
Estimated Fair Value	14,866		3,939
U.S. government agencies
Held to Maturity
Amortized Cost	50,685		49,481
Gross Unrealized Gains	10		174
Gross Unrealized Losses	(1,682)		(1,378)
Estimated Fair Value	49,013		48,277
Allowance for Credit Losses	0		0
Available for Sale
Amortized Cost	72,568		68,297
Gross Unrealized Gains	205		545
Gross Unrealized Losses	(1,164)		(524)
Estimated Fair Value	71,609		68,318
Private label residential
Held to Maturity
Amortized Cost	20,222		28,479
Gross Unrealized Gains	205		231
Gross Unrealized Losses	(1,009)		(980)
Estimated Fair Value	19,418		27,730
Allowance for Credit Losses	45	48	55		66	77	0
Municipal securities
Held to Maturity
Amortized Cost	605		1,330
Gross Unrealized Gains	6		8
Gross Unrealized Losses	0		0
Estimated Fair Value	611		1,338
Allowance for Credit Losses	0		0
Bank issued trust preferred securities
Held to Maturity
Amortized Cost	499		495
Gross Unrealized Gains	0		0
Gross Unrealized Losses	0		(18)
Estimated Fair Value	499		477
Allowance for Credit Losses	$ 1	$ 2	$ 5		$ 6	$ 8	$ 0
[1] Derived from audited consolidated financial statements.

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