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Fair Value Measurements: Schedule of estimated fair values of financial instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Sep. 30, 2019
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	271,644	143,015
CDs held for investment	72,014	78,346
Investment securities	72,574	53,634
Investments in equity securities	977	958
FHLB stock	1,922	1,437
Other investments, at cost	3,000	3,000
Loans held for sale	9,837	6,071
Loans receivable, net	1,012,759	886,662
Accrued interest receivable	4,614	3,598
Certificates of deposit	163,926	165,655
FHLB borrowings	10,000
Accrued interest payable	313	333
Fair Value
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	271,644	143,015
CDs held for investment	72,014	78,346
Investment securities	74,520	55,112
Investments in equity securities	977	958
FHLB stock	1,922	1,437
Other investments, at cost	3,000	3,000
Loans held for sale	10,246	6,260
Loans receivable, net	1,034,204	892,495
Accrued interest receivable	4,614	3,598
Certificates of deposit	166,585	166,852
FHLB borrowings	10,125
Accrued interest payable	313	333
Fair Value | Fair Value, Inputs, Level 1
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	271,644	143,015
CDs held for investment	72,014	78,346
Investment securities	0	3,949
Investments in equity securities	977	958
FHLB stock	1,922	1,437
Other investments, at cost	3,000	3,000
Loans held for sale	10,246	6,260
Loans receivable, net	0	0
Accrued interest receivable	4,614	3,598
Certificates of deposit	0	0
FHLB borrowings	0
Accrued interest payable	313	333
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	74,520	51,163
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
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	0	0
FHLB stock	0	0
Other investments, at cost	0	0
Loans held for sale	0	0
Loans receivable, net	1,034,204	892,495
Accrued interest receivable	0	0
Certificates of deposit	166,585	166,852
FHLB borrowings	10,125
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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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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Amount of investments classified as other.

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