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Fair Value Measurements: Schedule of estimated fair values of financial instruments (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Sep. 30, 2020
--- | --- | ---
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
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 | 433,342 | 314,452 |
CDs held for investment | 39,674 | 65,545 |
Investment securities | 105,649 | 85,797 |
Investments in equity securities | 957 | 977 |
FHLB stock | 2,303 | 1,922 |
Other investments, at cost | 3,000 | 3,000 |
Loans held for sale | 8,455 | 4,509 |
Loans receivable, net | 1,030,683 | 1,013,875 |
Accrued interest receivable | 4,471 | 4,484 |
Certificates of deposit | 142,781 | 158,524 |
FHLB borrowings | 10,000 | 10,000 |
Accrued interest payable | 182 | 274 |
Fair Value |  |  |
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash and cash equivalents | 433,342 | 314,452 |
CDs held for investment | 39,674 | 65,545 |
Investment securities | 107,022 | 87,734 |
Investments in equity securities | 957 | 977 |
FHLB stock | 2,303 | 1,922 |
Other investments, at cost | 3,000 | 3,000 |
Loans held for sale | 8,714 | 4,664 |
Loans receivable, net | 1,040,302 | 1,034,876 |
Accrued interest receivable | 4,471 | 4,484 |
Certificates of deposit | 144,344 | 160,921 |
FHLB borrowings | 9,939 | 10,167 |
Accrued interest payable | 182 | 274 |
Fair Value | Fair Value, Inputs, Level 1 |  |  |
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash and cash equivalents | 433,342 | 314,452 |
CDs held for investment | 39,674 | 65,545 |
Investment securities | 8,953 | 0 |
Investments in equity securities | 957 | 977 |
FHLB stock | 2,303 | 1,922 |
Other investments, at cost | 3,000 | 3,000 |
Loans held for sale | 8,714 | 4,664 |
Loans receivable, net | 0 | 0 |
Accrued interest receivable | 4,471 | 4,484 |
Certificates of deposit | 0 | 0 |
FHLB borrowings | 0 | 0 |
Accrued interest payable | 182 | 274 |
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 | 97,572 | 87,235 |
Investments in equity securities | 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 | 497 | 499 |
Investments in equity securities | 0 | 0 |
FHLB stock | 0 | 0 |
Other investments, at cost | 0 | 0 |
Loans held for sale | 0 | 0 |
Loans receivable, net | 1,040,302 | 1,034,876 |
Accrued interest receivable | 0 | 0 |
Certificates of deposit | 144,344 | 160,921 |
FHLB borrowings | 9,939 | 10,167 |
Accrued interest payable | $ 0 | $ 0 |
[1] | Derived from audited consolidated financial statements.

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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=99377092&loc=SL75136599-209740 + Details
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- Definition The fair value as of the balance sheet date of firm holdings in mortgages, mortgage backed securities (investment instruments that represent ownership of an undivided interest in a group of mortgages, where principal and interest from the individual mortgages are used to pay investors' principal and interest on the mortgage backed security) and asset-backed securities that are primarily paid from the cash flows of a discrete pool of receivables or other financial assets (such as credit-card receivables), either fixed or revolving, that by their terms convert into cash within a finite time period. Includes both pledged (to counterparties as collateral for financing transactions) and unpledged holdings. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35711157&loc=d3e42546-110969 + Details
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