Note 15: Disclosures About Fair Value of Financial Instruments: Fair Value, Assets Measured on Recurring Basis (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Recurring Assets, Fair Value Disclosure	$ 171,458	$ 165,042
Collateralized Mortgage Obligations
Recurring Assets, Fair Value Disclosure	185,091	151,950
US States and Political Subdivisions Debt Securities
Recurring Assets, Fair Value Disclosure	67,683	35,125
Small Business Administration securities
Recurring Assets, Fair Value Disclosure	21,708	22,058
Interest Rate Derivative Asset
Recurring Assets, Fair Value Disclosure	6,193	31,476
Interest Rate Derivative Liability
Recurring Assets, Fair Value Disclosure	(6,744)	(1,547)
Fair Value, Inputs, Level 1 | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Recurring Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 | Collateralized Mortgage Obligations
Recurring Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 | US States and Political Subdivisions Debt Securities
Recurring Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 | Small Business Administration securities
Recurring Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 | Interest Rate Derivative Asset
Recurring Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 1 | Interest Rate Derivative Liability
Recurring Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 2 | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Recurring Assets, Fair Value Disclosure	171,458	165,042
Fair Value, Inputs, Level 2 | Collateralized Mortgage Obligations
Recurring Assets, Fair Value Disclosure	185,091	151,950
Fair Value, Inputs, Level 2 | US States and Political Subdivisions Debt Securities
Recurring Assets, Fair Value Disclosure	67,683	35,125
Fair Value, Inputs, Level 2 | Small Business Administration securities
Recurring Assets, Fair Value Disclosure	21,708	22,058
Fair Value, Inputs, Level 2 | Interest Rate Derivative Asset
Recurring Assets, Fair Value Disclosure	6,193	31,476
Fair Value, Inputs, Level 2 | Interest Rate Derivative Liability
Recurring Assets, Fair Value Disclosure	(6,744)	(1,547)
Fair Value, Inputs, Level 3 | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Recurring Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 | Collateralized Mortgage Obligations
Recurring Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 | US States and Political Subdivisions Debt Securities
Recurring Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 | Small Business Administration securities
Recurring Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 | Interest Rate Derivative Asset
Recurring Assets, Fair Value Disclosure	0	0
Fair Value, Inputs, Level 3 | Interest Rate Derivative Liability
Recurring Assets, Fair Value Disclosure	$ 0	$ 0