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Fair Value Measurements: Schedule of estimated fair values of financial instruments (Details) - USD ($) $ in Thousands	Jun. 30, 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	503,726	314,452
CDs held for investment	31,218	65,545
Investment securities	119,805	85,797
Investments in equity securities	960	977
FHLB stock	2,103	1,922
Other investments, at cost	3,000	3,000
Loans held for sale	3,359	4,509
Loans receivable, net	1,001,565	1,013,875
Accrued interest receivable	4,260	4,484
Certificates of deposit	139,965	158,524
FHLB borrowings	5,000	10,000
Accrued interest payable	154	274
Fair Value
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	503,726	314,452
CDs held for investment	31,218	65,545
Investment securities	121,087	87,734
Investments in equity securities	960	977
FHLB stock	2,103	1,922
Other investments, at cost	3,000	3,000
Loans held for sale	3,467	4,664
Loans receivable, net	1,022,389	1,034,876
Accrued interest receivable	4,260	4,484
Certificates of deposit	141,225	160,921
FHLB borrowings	5,039	10,167
Accrued interest payable	154	274
Fair Value | Fair Value, Inputs, Level 1
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	503,726	314,452
CDs held for investment	31,218	65,545
Investment securities	18,816	0
Investments in equity securities	960	977
FHLB stock	2,103	1,922
Other investments, at cost	3,000	3,000
Loans held for sale	3,467	4,664
Loans receivable, net	0	0
Accrued interest receivable	4,260	4,484
Certificates of deposit	0	0
FHLB borrowings	0	0
Accrued interest payable	154	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	102,271	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	0	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	1,022,389	1,034,876
Accrued interest receivable	0	0
Certificates of deposit	141,225	160,921
FHLB borrowings	5,039	10,167
Accrued interest payable	$ 0	$ 0
[1] Derived from audited consolidated financial statements.

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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.

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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current.

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

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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.

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