Note 15: Disclosures About Fair Value of Financial Instruments: Fair Value, Assets and Liabilities Measured on Nonrecurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Impaired Loans
Non-recurring Assets, Fair Value Disclosure	$ 2,805	$ 1,590
Foreclosed assets held for sale
Non-recurring Assets, Fair Value Disclosure	1,776	1,758
Fair Value, Inputs, Level 1 | Impaired Loans
Non-recurring Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 | Foreclosed assets held for sale
Non-recurring Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 | Impaired Loans
Non-recurring Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 | Foreclosed assets held for sale
Non-recurring Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 | Impaired Loans
Non-recurring Assets, Fair Value Disclosure	2,805	1,590
Fair Value, Inputs, Level 3 | Foreclosed assets held for sale
Non-recurring Assets, Fair Value Disclosure	$ 1,776	$ 1,758