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Fair Value Measurements: Schedule of estimated fair values of financial instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Sep. 30, 2018
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	170,835	148,864
CDs held for investment	81,184	63,290
Investment securities	40,624	13,964
FHLB stock	1,437	1,190
Other investments, at cost	3,000	3,000
Loans held for sale	3,338	1,785
Loans receivable, net	873,982	725,391
Accrued interest receivable	3,759	2,877
Time deposits	164,193	141,808
Accrued interest payable	310	225
Fair Value
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	170,835	148,864
CDs held for investment	81,184	63,290
Investment securities	42,070	14,418
FHLB stock	1,437	1,190
Other investments, at cost	3,000	3,000
Loans held for sale	3,411	1,814
Loans receivable, net	873,520	711,071
Accrued interest receivable	3,759	2,877
Time deposits	165,086	140,831
Accrued interest payable	310	225
Fair Value | Fair Value, Inputs, Level 1
Fair value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	170,835	148,864
CDs held for investment	81,184	63,290
Investment securities	8,931	8,812
FHLB stock	1,437	1,190
Other investments, at cost	3,000	3,000
Loans held for sale	3,411	1,814
Loans receivable, net	0	0
Accrued interest receivable	3,759	2,877
Time deposits	0	0
Accrued interest payable	310	225
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	33,139	5,606
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
Time deposits	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
FHLB stock	0	0
Other investments, at cost	0	0
Loans held for sale	0	0
Loans receivable, net	873,520	711,071
Accrued interest receivable	0	0
Time deposits	165,086	140,831
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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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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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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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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