Note 4: Loans and Allowance for Loan Losses: Schedule of Balance in the Allowance for Loan Losses and Recorded Investment (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020
Loans Receivable
Impact of CECL adoption	$ 9,333
Financing Receivable, Credit Loss, Expense (Reversal)	774	$ 896
Allowance for Loan and Lease Losses, Write-offs	(170)	(107)
Accounts Receivable, Allowance for Credit Loss, Recovery	8	18
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		0	$ 0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		20,710	25,139
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality		0	0
Financing Receivable, Individually Evaluated for Impairment			0
Financing Receivable, Collectively Evaluated for Impairment			2,149,664
Financing Receivables Acquired with Deteriorated Credit Quality			21,799
Loans Receivable \| Beginning of Period
Allowance for Loan Losses		19,903	25,139
Loans Receivable \| Beginning of Period \| Prior to adoption of CECL
Allowance for Loan Losses	25,139
Loans Receivable \| End of Period
Allowance for Loan Losses	35,084	20,710
Consumer Loan
Impact of CECL adoption	1,065
Financing Receivable, Credit Loss, Expense (Reversal)	61	96
Allowance for Loan and Lease Losses, Write-offs	(6)	(72)
Accounts Receivable, Allowance for Credit Loss, Recovery	3	4
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		1,074	1,182
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality		0	0
Financing Receivable, Individually Evaluated for Impairment			0
Financing Receivable, Collectively Evaluated for Impairment			80,767
Financing Receivables Acquired with Deteriorated Credit Quality			0
Consumer Loan \| Beginning of Period
Allowance for Loan Losses		1,046	1,182
Consumer Loan \| Beginning of Period \| Prior to adoption of CECL
Allowance for Loan Losses	1,182
Consumer Loan \| End of Period
Allowance for Loan Losses	2,305	1,074
Commercial Loan
Impact of CECL adoption	1,012
Financing Receivable, Credit Loss, Expense (Reversal)	397	384
Allowance for Loan and Lease Losses, Write-offs	(145)	(35)
Accounts Receivable, Allowance for Credit Loss, Recovery	4	0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		4,736	4,940
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality		0	0
Financing Receivable, Individually Evaluated for Impairment			0
Financing Receivable, Collectively Evaluated for Impairment			463,902
Financing Receivables Acquired with Deteriorated Credit Quality			4,546
Commercial Loan \| Beginning of Period
Allowance for Loan Losses		4,387	4,940
Commercial Loan \| Beginning of Period \| Prior to adoption of CECL
Allowance for Loan Losses	4,940
Commercial Loan \| End of Period
Allowance for Loan Losses	6,208	4,736
Construction Loan Payable
Impact of CECL adoption	(121)
Financing Receivable, Credit Loss, Expense (Reversal)	3	174
Allowance for Loan and Lease Losses, Write-offs	0	0
Accounts Receivable, Allowance for Credit Loss, Recovery	0	0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		1,539	2,010
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality		0	0
Financing Receivable, Individually Evaluated for Impairment			0
Financing Receivable, Collectively Evaluated for Impairment			106,194
Financing Receivables Acquired with Deteriorated Credit Quality			1,278
Construction Loan Payable \| Beginning of Period
Allowance for Loan Losses		1,365	2,010
Construction Loan Payable \| Beginning of Period \| Prior to adoption of CECL
Allowance for Loan Losses	2,010
Construction Loan Payable \| End of Period
Allowance for Loan Losses	1,892	1,539
Residential Real Estate
Impact of CECL adoption	3,521
Financing Receivable, Credit Loss, Expense (Reversal)	252	(134)
Allowance for Loan and Lease Losses, Write-offs	(19)	0
Accounts Receivable, Allowance for Credit Loss, Recovery	0	0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		3,572	4,875
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality		0	0
Financing Receivable, Individually Evaluated for Impairment			0
Financing Receivable, Collectively Evaluated for Impairment			626,085
Financing Receivables Acquired with Deteriorated Credit Quality			1,272
Residential Real Estate \| Beginning of Period
Allowance for Loan Losses		3,706	4,875
Residential Real Estate \| Beginning of Period \| Prior to adoption of CECL
Allowance for Loan Losses	4,875
Residential Real Estate \| End of Period
Allowance for Loan Losses	8,629	3,572
Commercial Real Estate
Impact of CECL adoption	3,856
Financing Receivable, Credit Loss, Expense (Reversal)	61	376
Allowance for Loan and Lease Losses, Write-offs	0	0
Accounts Receivable, Allowance for Credit Loss, Recovery	1	14
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment		0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment		9,789	12,132
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality		0	0
Financing Receivable, Individually Evaluated for Impairment			0
Financing Receivable, Collectively Evaluated for Impairment			872,716
Financing Receivables Acquired with Deteriorated Credit Quality			14,703
Commercial Real Estate \| Beginning of Period
Allowance for Loan Losses		9,399	$ 12,132
Commercial Real Estate \| Beginning of Period \| Prior to adoption of CECL
Allowance for Loan Losses	12,132
Commercial Real Estate \| End of Period
Allowance for Loan Losses	$ 16,050	$ 9,789

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No definition available.

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Represents the monetary amount of Financing Receivables Acquired with Deteriorated Credit Quality, during the indicated time period.

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No definition available.

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Represents the monetary amount of Impact of CECL adoption, during the indicated time period.

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Amount of increase in allowance for credit loss on accounts receivable, from recovery.

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- Definition

Amount of loans and leases that have been written off from both loan receivables and allowance reserve for credit loss.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
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The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment.

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Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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The balance of financing receivables that were collectively evaluated for impairment.

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The balance of financing receivables that were individually evaluated for impairment.

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- Definition

Amount of credit loss expense (reversal of expense) for financing receivable.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447

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-Publisher FASB
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