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Investment Securities: Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023
Held to Maturity
Amortized Cost	$ 211,818		$ 270,218	[1]
Gross Unrealized Gains	331		295
Gross Unrealized Losses	(11,342)		(16,747)
Estimated Fair Value	200,807		253,766
Allowance for Credit Losses ("ACL")	85	$ 82	0
Available for Sale
Amortized Cost	62,689		43,132
Gross Unrealized Gains	34		0
Gross Unrealized Losses	(977)		(1,361)
Estimated Fair Value	61,746		41,771
U.S. Treasury and U.S. government agency securities
Held to Maturity
Amortized Cost	122,087		171,626
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(6,952)		(10,088)
Estimated Fair Value	115,135		161,538
Allowance for Credit Losses ("ACL")	0
U.S. government agencies
Held to Maturity
Amortized Cost	52,218		52,294
Gross Unrealized Gains	3		0
Gross Unrealized Losses	(2,676)		(3,950)
Estimated Fair Value	49,545		48,344
Allowance for Credit Losses ("ACL")	0
Available for Sale
Amortized Cost	62,689		43,132
Gross Unrealized Gains	34		0
Gross Unrealized Losses	(977)		(1,361)
Estimated Fair Value	61,746		41,771
Private label residential
Held to Maturity
Amortized Cost	35,153		44,011
Gross Unrealized Gains	328		295
Gross Unrealized Losses	(1,658)		(2,611)
Estimated Fair Value	33,823		41,695
Allowance for Credit Losses ("ACL")	77	73	0
Municipal securities
Held to Maturity
Amortized Cost	1,868		1,787
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(24)		(47)
Estimated Fair Value	1,844		1,740
Allowance for Credit Losses ("ACL")	0
Bank issued trust preferred securities
Held to Maturity
Amortized Cost	492		500
Gross Unrealized Gains	0		0
Gross Unrealized Losses	(32)		(51)
Estimated Fair Value	460		449
Allowance for Credit Losses ("ACL")	$ 8	$ 9	$ 0
[1] Derived from audited consolidated financial statements.

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