Note 11: Fair Value Measurements: Fair Value Option, Disclosures (Details) - Fair Value, Inputs, Level 3 - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018
Foreclosed and Repossessed Assets
Fair Value Asset Liability Measured On Nonrecurring Basis With Unobservable Inputs	$ 3,948	$ 3,924
Foreclosed and Repossessed Assets | Third party appraisal
Fair Value Measurements Nonrecurring Valuation Technique	Third party appraisal	Third party appraisal
Foreclosed and Repossessed Assets | Third party appraisal | Marketability discount
Fair Value Measurements Nonrecurring Unobservable Inputs	Marketability discount	Marketability discount
Fair Value Measurements Nonrecurring Range of discounts Applied	0.0% - 60.3%	0.0% - 65.9%
Fair Value Measurements Nonrecurring Weighted Average Discount Applied	32.8%	32.3%
Impaired loans (collateral dependent)
Fair Value Asset Liability Measured On Nonrecurring Basis With Unobservable Inputs		$ 490
Fair Value Measurements Nonrecurring Range of discounts Applied		n/a
Impaired loans (collateral dependent) | Discount to reflect realizable value
Fair Value Measurements Nonrecurring Unobservable Inputs		Discount to reflect realizable value
Impaired loans (collateral dependent) | Internal Valuation
Fair Value Measurements Nonrecurring Valuation Technique		Internal Valuation