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Fair Value Measurements: Schedule of estimated fair values of financial instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Sep. 30, 2024
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments in equity securities, at fair value	$ 840	$ 866
Other investments, at cost	3,000	3,000	[1]
Recorded Amount
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	164,071	164,728
CDs held for investment	7,470	10,209
Investment securities	233,185	244,354
Investments in equity securities, at fair value	840	866
FHLB stock	2,037	2,037
Other investments, at cost	3,000	3,000
Loans held for sale	411
Loans receivable, net	1,411,819	1,421,523
Accrued interest receivable	7,095	6,990
Certificates of deposit	385,835	368,308
FHLB borrowings	20,000	20,000
Accrued interest payable	1,876	2,132
Fair Value
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	164,071	164,728
CDs held for investment	7,470	10,209
Investment securities	224,790	238,264
Investments in equity securities, at fair value	840	866
FHLB stock	2,037	2,037
Other investments, at cost	3,000	3,000
Loans held for sale	424
Loans receivable, net	1,372,737	1,387,642
Accrued interest receivable	7,095	6,990
Certificates of deposit	385,987	368,312
FHLB borrowings	19,896	20,035
Accrued interest payable	1,876	2,132
Fair Value | Fair Value, Inputs, Level 1
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	164,071	164,728
CDs held for investment	7,470	10,209
Investment securities	84,019	146,141
Investments in equity securities, at fair value	840	866
FHLB stock	2,037	2,037
Other investments, at cost	3,000	3,000
Loans held for sale	424
Loans receivable, net	0	0
Accrued interest receivable	7,095	6,990
Certificates of deposit	0	0
FHLB borrowings	0	0
Accrued interest payable	1,876	2,132
Fair Value | Fair Value, Inputs, Level 2
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
CDs held for investment	0	0
Investment securities	140,771	92,123
Investments in equity securities, at fair value	0	0
FHLB stock	0	0
Other investments, at cost	0	0
Loans held for sale	0
Loans receivable, net	0	0
Accrued interest receivable	0	0
Certificates of deposit	0	0
FHLB borrowings	0	0
Accrued interest payable	0	0
Fair Value | Fair Value, Inputs, Level 3
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	0	0
CDs held for investment	0	0
Investment securities	0	0
Investments in equity securities, at fair value	0	0
FHLB stock	0	0
Other investments, at cost	0	0
Loans held for sale	0
Loans receivable, net	1,372,737	1,387,642
Accrued interest receivable	0	0
Certificates of deposit	385,987	368,312
FHLB borrowings	19,896	20,035
Accrued interest payable	$ 0	$ 0
[1] Derived from audited consolidated financial statements.

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