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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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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).

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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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Amount of investments classified as other.

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