Note 14: Disclosures About Fair Value of Financial Instruments: Fair Value Measurement, Policy: Fair Value, Assets and Liabilities Measured on Nonrecurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Foreclosed Assets Held For Sale
Non-recurring Assets, Fair Value Disclosure	$ 3,014	$ 1,758
Loans Receivable Impaired
Non-recurring Assets, Fair Value Disclosure	2,996	1,590
Fair Value, Inputs, Level 1 | Foreclosed Assets Held For Sale
Non-recurring Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 | Loans Receivable Impaired
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 2 | Loans Receivable Impaired
Non-recurring Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 | Foreclosed Assets Held For Sale
Non-recurring Assets, Fair Value Disclosure	3,014	1,758
Fair Value, Inputs, Level 3 | Loans Receivable Impaired
Non-recurring Assets, Fair Value Disclosure	$ 2,996	$ 1,590