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Note 15: Disclosures About Fair Value of Financial Instruments: Fair Value, Assets Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Recurring Assets, Fair Value Disclosure $ 180,529 $ 165,042
Collateralized Mortgage Obligations    
Recurring Assets, Fair Value Disclosure 160,234 151,950
US States and Political Subdivisions Debt Securities    
Recurring Assets, Fair Value Disclosure 33,192 35,125
Small Business Administration Securities    
Recurring Assets, Fair Value Disclosure 21,844 22,058
Interest rate derivative asset    
Recurring Assets, Fair Value Disclosure 5,329 31,476
Interest rate derivative liability    
Recurring Assets, Fair Value Disclosure (5,863) (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 180,529 165,042
Fair Value, Inputs, Level 2 | Collateralized Mortgage Obligations    
Recurring Assets, Fair Value Disclosure 160,234 151,950
Fair Value, Inputs, Level 2 | US States and Political Subdivisions Debt Securities    
Recurring Assets, Fair Value Disclosure 33,192 35,125
Fair Value, Inputs, Level 2 | Small Business Administration Securities    
Recurring Assets, Fair Value Disclosure 21,844 22,058
Fair Value, Inputs, Level 2 | Interest rate derivative asset    
Recurring Assets, Fair Value Disclosure 5,329 31,476
Fair Value, Inputs, Level 2 | Interest rate derivative liability    
Recurring Assets, Fair Value Disclosure (5,863) (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