Note 4: Loans and Allowance for Loan Losses: Schedule of Balance in the Allowance for Loan Losses and Recorded Investment (Details) - USD ($)		3 Months Ended		6 Months Ended	9 Months Ended
	Jun. 30, 2019	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Loans Receivable
Financing Receivable, Credit Loss, Expense (Reversal)		$ 2,850	$ 491	$ 4,134	$ 1,486
Allowance for Loan and Lease Losses, Write-offs		(190)	(97)	(607)	(293)
Accounts Receivable, Allowance for Credit Loss, Recovery		34	17	78	27
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	$ 0	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	19,903	23,508	19,434	23,508	19,434
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality	0			0	0
Financing Receivable, Individually Evaluated for Impairment	0	0		0
Financing Receivable, Collectively Evaluated for Impairment	1,837,763	1,967,732		1,967,732
Financing Receivables Acquired with Deteriorated Credit Quality	28,548			23,598
Loans Receivable | Beginning of Period
Allowance for Loan Losses	19,903	20,814	19,023	19,903	18,214
Loans Receivable | End of Period
Allowance for Loan Losses		23,508	19,434	23,508	19,434
Consumer Loan
Financing Receivable, Credit Loss, Expense (Reversal)		64	30	156	110
Allowance for Loan and Lease Losses, Write-offs		(19)	(27)	(117)	(47)
Accounts Receivable, Allowance for Credit Loss, Recovery		7	3	17	8
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,046	1,102	973	1,102	973
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality	0			0	0
Financing Receivable, Individually Evaluated for Impairment	0	0		0
Financing Receivable, Collectively Evaluated for Impairment	97,534	94,645		94,645
Financing Receivables Acquired with Deteriorated Credit Quality	0			0
Consumer Loan | Beginning of Period
Allowance for Loan Losses	1,046	1,050	967	1,046	902
Consumer Loan | End of Period
Allowance for Loan Losses		1,102	973	1,102	973
Commercial Loan
Financing Receivable, Credit Loss, Expense (Reversal)		70	(186)	397	(99)
Allowance for Loan and Lease Losses, Write-offs		(26)	(31)	(173)	(78)
Accounts Receivable, Allowance for Credit Loss, Recovery		27	1	28	2
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	4,387	4,639	4,021	4,639	4,021
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality	0			0	0
Financing Receivable, Individually Evaluated for Impairment	0	0		0
Financing Receivable, Collectively Evaluated for Impairment	349,681	321,858		321,858
Financing Receivables Acquired with Deteriorated Credit Quality	6,193			5,729
Commercial Loan | Beginning of Period
Allowance for Loan Losses	4,387	4,568	4,237	4,387	4,196
Commercial Loan | End of Period
Allowance for Loan Losses		4,639	4,021	4,639	4,021
Construction Loan Payable
Financing Receivable, Credit Loss, Expense (Reversal)		(46)	59	246	153
Allowance for Loan and Lease Losses, Write-offs		0	0	0	0
Accounts Receivable, Allowance for Credit Loss, Recovery		0	0	0	0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	1,365	1,611	1,250	1,611	1,250
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality	0			0	0
Financing Receivable, Individually Evaluated for Impairment	0	0		0
Financing Receivable, Collectively Evaluated for Impairment	78,826	90,764		90,764
Financing Receivables Acquired with Deteriorated Credit Quality	1,308			1,289
Construction Loan Payable | Beginning of Period
Allowance for Loan Losses	1,365	1,657	1,191	1,365	1,097
Construction Loan Payable | End of Period
Allowance for Loan Losses		1,611	1,250	1,611	1,250
Residential Real Estate
Financing Receivable, Credit Loss, Expense (Reversal)		1,035	196	1,195	612
Allowance for Loan and Lease Losses, Write-offs		(133)	(18)	(305)	(27)
Accounts Receivable, Allowance for Credit Loss, Recovery		0	12	18	12
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	3,706	4,614	3,823	4,614	3,823
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality	0			0	0
Financing Receivable, Individually Evaluated for Impairment	0	0		0
Financing Receivable, Collectively Evaluated for Impairment	490,307	582,496		582,496
Financing Receivables Acquired with Deteriorated Credit Quality	1,685			1,280
Residential Real Estate | Beginning of Period
Allowance for Loan Losses	3,706	3,712	3,633	3,706	3,226
Residential Real Estate | End of Period
Allowance for Loan Losses		4,614	3,823	4,614	3,823
Commercial Real Estate
Financing Receivable, Credit Loss, Expense (Reversal)		1,727	392	2,140	710
Allowance for Loan and Lease Losses, Write-offs		(12)	(21)	(12)	(141)
Accounts Receivable, Allowance for Credit Loss, Recovery		0	1	15	5
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0	0	0	0	0
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	9,399	11,542	9,367	11,542	9,367
Financing Receivables Allowance for Credit Losses Acquired with Deteriorated Credit Quality	0			0	0
Financing Receivable, Individually Evaluated for Impairment	0	0		0
Financing Receivable, Collectively Evaluated for Impairment	821,415	877,969		877,969
Financing Receivables Acquired with Deteriorated Credit Quality	19,362			15,300
Commercial Real Estate | Beginning of Period
Allowance for Loan Losses	$ 9,399	9,827	8,995	9,399	8,793
Commercial Real Estate | End of Period
Allowance for Loan Losses		$ 11,542	$ 9,367	$ 11,542	$ 9,367