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Fair Value Measurements: Schedule of estimated fair values of financial instruments (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Sep. 30, 2022
--- | --- | ---
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investments in equity securities, at fair value | $ 837 | $ 835 |
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 | 129,953 | 316,755 |
CDs held for investment | 16,931 | 22,894 |
Investment securities | 318,895 | 308,023 |
Investments in equity securities, at fair value | 837 | 835 |
FHLB stock | 2,802 | 2,194 |
Other investments, at cost | 3,000 | 3,000 |
Loans held for sale |  | 748 |
Loans receivable, net | 1,260,647 | 1,132,426 |
Accrued interest receivable | 5,451 | 4,483 |
Certificates of deposit | 251,313 | 122,584 |
FHLB borrowings | 15,000 |  |
Accrued interest payable | 881 | 108 |
Fair Value |  |  |
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash and cash equivalents | 129,953 | 316,755 |
CDs held for investment | 16,767 | 22,519 |
Investment securities | 304,313 | 291,198 |
Investments in equity securities, at fair value | 837 | 835 |
FHLB stock | 2,802 | 2,194 |
Other investments, at cost | 3,000 | 3,000 |
Loans held for sale |  | 758 |
Loans receivable, net | 1,219,328 | 1,124,579 |
Accrued interest receivable | 5,451 | 4,483 |
Certificates of deposit | 248,541 | 120,807 |
FHLB borrowings | 14,665 |  |
Accrued interest payable | 881 | 108 |
Fair Value | Fair Value, Inputs, Level 1 |  |  |
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash and cash equivalents | 129,953 | 316,755 |
CDs held for investment | 16,767 | 22,519 |
Investment securities | 161,458 | 158,578 |
Investments in equity securities, at fair value | 837 | 835 |
FHLB stock | 2,802 | 2,194 |
Other investments, at cost | 3,000 | 3,000 |
Loans held for sale |  | 758 |
Loans receivable, net | 0 | 0 |
Accrued interest receivable | 5,451 | 4,483 |
Certificates of deposit | 0 | 0 |
FHLB borrowings | 0 |  |
Accrued interest payable | 881 | 108 |
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 | 142,855 | 132,620 |
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 |  |
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 | 1,219,328 | 1,124,579 |
Accrued interest receivable | 0 | 0 |
Certificates of deposit | 248,541 | 120,807 |
FHLB borrowings | 14,665 |  |
Accrued interest payable | $ 0 | $ 0 |
[1] | Derived from audited consolidated financial statements.

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