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Loans Receivable and Allowance for Loan Losses: Summary of TDR Loans (Details) - USD ($)	Sep. 30, 2020	Sep. 30, 2019
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDR loans included in impaired loans	$ 3,071,000	$ 3,269,000
TDR Loans, commitment to lend additional funds	0	0
Allowance for loan losses	13,414,000	9,690,000
Troubled Debt Restructured Loans
Financing Receivable, Troubled Debt Restructuring [Line Items]
Allowance for loan losses	$ 3,000	$ 56,000

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- References

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Troubled debt restructured loans included in impaired loans.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 942
-SubTopic 210
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