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Note 15: Disclosures About Fair Value of Financial Instruments: Fair Value, Assets Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Recurring Assets, Fair Value Disclosure $ 165,042 $ 153,258
Collateralized Mortgage Obligations    
Recurring Assets, Fair Value Disclosure 151,950 39,260
US States and Political Subdivisions Debt Securities    
Recurring Assets, Fair Value Disclosure 35,125 51,450
Small Business Administration    
Recurring Assets, Fair Value Disclosure 22,058  
Interest rate derivative asset    
Recurring Assets, Fair Value Disclosure 31,476 12,800
Interest rate derivative liability    
Recurring Assets, Fair Value Disclosure (1,547) (716)
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    
Recurring Assets, Fair Value Disclosure 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 165,042 153,258
Fair Value, Inputs, Level 2 | Collateralized Mortgage Obligations    
Recurring Assets, Fair Value Disclosure 151,950 39,260
Fair Value, Inputs, Level 2 | US States and Political Subdivisions Debt Securities    
Recurring Assets, Fair Value Disclosure 35,125 51,450
Fair Value, Inputs, Level 2 | Small Business Administration    
Recurring Assets, Fair Value Disclosure 22,058  
Fair Value, Inputs, Level 2 | Interest rate derivative asset    
Recurring Assets, Fair Value Disclosure 31,476 12,800
Fair Value, Inputs, Level 2 | Interest rate derivative liability    
Recurring Assets, Fair Value Disclosure (1,547) (716)
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    
Recurring Assets, Fair Value Disclosure 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