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Fair Value Measurements: Schedule of estimated fair values of financial instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Sep. 30, 2024
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments in equity securities, at fair value	$ 855	$ 866	[1]
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	193,627	164,728
CDs held for investment	8,462	10,209
Investment securities	228,045	244,354
Investments in equity securities, at fair value	855	866
FHLB stock	2,045	2,037
Other investments, at cost	3,000	3,000
Loans held for sale	1,763
Loans receivable, net	1,441,496	1,421,523
Accrued interest receivable	7,174	6,990
Certificates of deposit	417,297	368,308
FHLB borrowings	20,000	20,000
Accrued interest payable	1,740	2,132
Fair Value
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	193,627	164,728
CDs held for investment	8,462	10,209
Investment securities	222,097	238,264
Investments in equity securities, at fair value	855	866
FHLB stock	2,045	2,037
Other investments, at cost	3,000	3,000
Loans held for sale	1,800
Loans receivable, net	1,412,845	1,387,642
Accrued interest receivable	7,174	6,990
Certificates of deposit	417,098	368,312
FHLB borrowings	19,974	20,035
Accrued interest payable	1,740	2,132
Fair Value | Fair Value, Inputs, Level 1
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	193,627	164,728
CDs held for investment	8,462	10,209
Investment securities	80,948	92,124
Investments in equity securities, at fair value	855	866
FHLB stock	2,045	2,037
Other investments, at cost	3,000	3,000
Loans held for sale	1,800
Loans receivable, net	0	0
Accrued interest receivable	7,174	6,990
Certificates of deposit	0	0
FHLB borrowings	0	0
Accrued interest payable	1,740	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	141,149	146,140
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	1,412,845	1,387,642
Accrued interest receivable	0	0
Certificates of deposit	417,098	368,312
FHLB borrowings	19,974	20,035
Accrued interest payable	$ 0	$ 0
[1] Derived from audited consolidated financial statements.

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