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Fair Value Measurements: Schedule of estimated fair values of financial instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Sep. 30, 2023
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments in equity securities, at fair value	$ 848	$ 811
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	158,021	128,721
CDs held for investment	12,449	15,188
Investment securities	306,531	311,989
Investments in equity securities, at fair value	848	811
FHLB stock	2,001	3,602
Other investments, at cost	3,000	3,000
Loans held for sale	1,425	400
Loans receivable, net	1,336,283	1,302,305
Accrued interest receivable	6,731	6,004
Certificates of deposit	318,907	300,100
FHLB borrowings	20,000	35,000
Accrued interest payable	1,683	1,397
Fair Value
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	158,021	128,721
CDs held for investment	12,449	15,188
Investment securities	294,807	295,538
Investments in equity securities, at fair value	848	811
FHLB stock	2,001	3,602
Other investments, at cost	3,000	3,000
Loans held for sale	1,426	407
Loans receivable, net	1,286,383	1,246,538
Accrued interest receivable	6,731	6,004
Certificates of deposit	317,531	297,542
FHLB borrowings	19,877	34,747
Accrued interest payable	1,683	1,397
Fair Value | Fair Value, Inputs, Level 1
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	158,021	128,721
CDs held for investment	12,449	15,188
Investment securities	162,401	161,538
Investments in equity securities, at fair value	848	811
FHLB stock	2,001	3,602
Other investments, at cost	3,000	3,000
Loans held for sale	1,426	407
Loans receivable, net	0	0
Accrued interest receivable	6,731	6,004
Certificates of deposit	0	0
FHLB borrowings	0	0
Accrued interest payable	1,683	1,397
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	132,406	134,000
Investments in equity securities, at fair value	0	0
FHLB stock	0	0
Other investments, at cost	0	0
Loans held for sale	0	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	0
Loans receivable, net	1,286,383	1,246,538
Accrued interest receivable	0	0
Certificates of deposit	317,531	297,542
FHLB borrowings	19,877	34,747
Accrued interest payable	$ 0	$ 0
[1] Derived from audited consolidated financial statements.

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Fair value portion of borrowing from Federal Home Loan Bank (FHLBank).

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