Note 2: Available-for-sale Securities: Securities Pledged as Collateral Policy (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Federal Funds Sold and Securities Purchased under Agreements to Resell Pledged as Collateral	$ 124,200	$ 114,100
US Government and Federal Agency Obligations
Security Owned and Pledged as Collateral, Fair Value	8,400	6,500
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Security Owned and Pledged as Collateral, Fair Value	39,800	50,500
Collateralized Mortgage Obligations
Security Owned and Pledged as Collateral, Fair Value	41,500	19,900
US States and Political Subdivisions Debt Securities
Security Owned and Pledged as Collateral, Fair Value	34,200	36,800
Other Securities
Security Owned and Pledged as Collateral, Fair Value	$ 300	$ 400