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Note 15: Disclosures About Fair Value of Financial Instruments: Fair Value Measurement, Policy: Fair Value, Assets Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Recurring Assets, Fair Value Disclosure $ 191,577 $ 153,258
Collateralized Mortgage Obligations    
Recurring Assets, Fair Value Disclosure 71,807 39,260
US States and Political Subdivisions Debt Securities    
Recurring Assets, Fair Value Disclosure 42,265 51,450
Interest rate derivative asset    
Recurring Assets, Fair Value Disclosure 31,855 12,800
Interest rate derivative liability    
Recurring Assets, Fair Value Disclosure (1,281) (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 | 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 191,577 153,258
Fair Value, Inputs, Level 2 | Collateralized Mortgage Obligations    
Recurring Assets, Fair Value Disclosure 71,807 39,260
Fair Value, Inputs, Level 2 | US States and Political Subdivisions Debt Securities    
Recurring Assets, Fair Value Disclosure 42,265 51,450
Fair Value, Inputs, Level 2 | Interest rate derivative asset    
Recurring Assets, Fair Value Disclosure 31,855 12,800
Fair Value, Inputs, Level 2 | Interest rate derivative liability    
Recurring Assets, Fair Value Disclosure (1,281) (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 | 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