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Note 14: Disclosures About Fair Value of Financial Instruments: Fair Value Measurement, Policy: Fair Value, Assets Measured on Recurring Basis (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Assets, Fair Value Disclosure, Recurring $ 117,798 $ 122,533
US States and Political Subdivisions Debt Securities    
Assets, Fair Value Disclosure, Recurring 53,823 56,646
Interest rate derivative asset    
Assets, Fair Value Disclosure, Recurring 1,047 981
Interest rate derivative liability    
Assets, Fair Value Disclosure, Recurring (1,058) (1,030)
Fair Value, Inputs, Level 1 | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Assets, Fair Value Disclosure, Recurring 0 0
Fair Value, Inputs, Level 1 | US States and Political Subdivisions Debt Securities    
Assets, Fair Value Disclosure, Recurring 0 0
Fair Value, Inputs, Level 1 | Interest rate derivative asset    
Assets, Fair Value Disclosure, Recurring 0 0
Fair Value, Inputs, Level 1 | Interest rate derivative liability    
Assets, Fair Value Disclosure, Recurring 0 0
Fair Value, Inputs, Level 2 | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Assets, Fair Value Disclosure, Recurring 117,798 122,533
Fair Value, Inputs, Level 2 | US States and Political Subdivisions Debt Securities    
Assets, Fair Value Disclosure, Recurring 53,823 56,646
Fair Value, Inputs, Level 2 | Interest rate derivative asset    
Assets, Fair Value Disclosure, Recurring 1,047 981
Fair Value, Inputs, Level 2 | Interest rate derivative liability    
Assets, Fair Value Disclosure, Recurring (1,058) (1,030)
Fair Value, Inputs, Level 3 | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Assets, Fair Value Disclosure, Recurring 0 0
Fair Value, Inputs, Level 3 | US States and Political Subdivisions Debt Securities    
Assets, Fair Value Disclosure, Recurring 0 0
Fair Value, Inputs, Level 3 | Interest rate derivative asset    
Assets, Fair Value Disclosure, Recurring 0 0
Fair Value, Inputs, Level 3 | Interest rate derivative liability    
Assets, Fair Value Disclosure, Recurring $ 0 $ 0