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Fair Value Measurements: Schedule of estimated fair values of financial instruments (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Sep. 30, 2021
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments in equity securities	$ 946	$ 955
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	558,328	580,196
CDs held for investment	24,648	28,482
Investment securities	171,152	132,278
Investments in equity securities	946	955
FHLB stock	2,103	2,103
Other investments, at cost	3,000	3,000
Loans held for sale	3,700	3,217
Loans receivable, net	994,007	968,454
Accrued interest receivable	3,938	3,745
Certificates of deposit	132,155	134,129
Accrued interest payable	124	134
Fair Value
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	558,328	580,196
CDs held for investment	24,648	28,482
Investment securities	171,751	133,286
Investments in equity securities	946	955
FHLB stock	2,103	2,103
Other investments, at cost	3,000	3,000
Loans held for sale	3,790	3,290
Loans receivable, net	1,004,899	981,905
Accrued interest receivable	3,938	3,745
Certificates of deposit	133,005	135,178
Accrued interest payable	124	134
Fair Value | Fair Value, Inputs, Level 1
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	558,328	580,196
CDs held for investment	24,648	28,482
Investment securities	67,005	28,670
Investments in equity securities	946	955
FHLB stock	2,103	2,103
Other investments, at cost	3,000	3,000
Loans held for sale	3,790	3,290
Loans receivable, net	0	0
Accrued interest receivable	3,938	3,745
Certificates of deposit	0	0
Accrued interest payable	124	134
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	104,746	104,616
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
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	1,004,899	981,905
Accrued interest receivable	0	0
Certificates of deposit	133,005	135,178
Accrued interest payable	$ 0	$ 0
[1] Derived from audited consolidated financial statements.

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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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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 investments in Federal Home Loan Bank (FHLBank) stock.

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Amount of investments classified as other.

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