Note 4: Loans and Allowance for Loan Losses (Details) $ in Thousands			6 Months Ended
	Dec. 31, 2018 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($)
Financing Receivable, Credit Quality, Additional Information			lending relationships of $1 million or more, exclusive of any consumer or owner-occupied residential loan, are subject to an annual credit analysis which is prepared by the loan administration department and presented to a loan committee with appropriate lending authority. A sample of lending relationships in excess of $2.5 million are subject to an independent loan review annually, in order to verify risk ratings
Number of Purchased Credit Impaired Loans	1	2
Foreclosed residential real estate properties physical possession	$ 646	$ 472	$ 646
Residential mortgage loans and home equity loans formal foreclosure proceedings in process	895	331	895
Loans without a specific valuation allowance
Purchased Credit Impaired Loans	28,600	14,600	28,600
Financing Receivables, Equal to Greater than 90 Days Past Due
Purchased Credit Impaired Loans	$ 3,100	$ 1,100	$ 3,100