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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Sep. 30, 2024		Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023
Held to Maturity
Amortized Cost	$ 140,954		$ 172,097	[1]
Gross Unrealized Gains	288		483
Gross Unrealized Losses	(6,860)		(6,573)
Estimated Fair Value	134,382		166,007
Allowance for Credit Losses	50	$ 55	60		$ 85	$ 82	$ 0
Available for Sale
Amortized Cost	85,655		72,231
Gross Unrealized Gains	210		551
Gross Unrealized Losses	(1,058)		(525)
Estimated Fair Value	84,807		72,257
U.S. Treasury and U.S. government agency securities
Held to Maturity
Amortized Cost	69,475		92,312
Gross Unrealized Gains	7		70
Gross Unrealized Losses	(3,953)		(4,197)
Estimated Fair Value	65,529		88,185
Allowance for Credit Losses	0		0
Available for Sale
Amortized Cost	9,576		3,934
Gross Unrealized Gains	27		6
Gross Unrealized Losses	(9)		(1)
Estimated Fair Value	9,594		3,939
U.S. government agencies
Held to Maturity
Amortized Cost	47,017		49,481
Gross Unrealized Gains	11		174
Gross Unrealized Losses	(1,776)		(1,378)
Estimated Fair Value	45,252		48,277
Allowance for Credit Losses	0		0
Available for Sale
Amortized Cost	76,079		68,297
Gross Unrealized Gains	183		545
Gross Unrealized Losses	(1,049)		(524)
Estimated Fair Value	75,213		68,318
Private label residential
Held to Maturity
Amortized Cost	22,744		28,479
Gross Unrealized Gains	261		231
Gross Unrealized Losses	(1,128)		(980)
Estimated Fair Value	21,877		27,730
Allowance for Credit Losses	48	52	55		77	73	0
Municipal securities
Held to Maturity
Amortized Cost	1,220		1,330
Gross Unrealized Gains	9		8
Gross Unrealized Losses	0		0
Estimated Fair Value	1,229		1,338
Allowance for Credit Losses	0		0
Bank issued trust preferred securities
Held to Maturity
Amortized Cost	498		495
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(3)		(18)
Estimated Fair Value	495		477
Allowance for Credit Losses	$ 2	$ 3	$ 5		$ 8	$ 9	$ 0
[1] Derived from audited consolidated financial statements.

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