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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
Sep. 30, 2017
Dec. 31, 2016
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises    
Assets, Fair Value Disclosure, Recurring $ 125,810 $ 146,035
US States and Political Subdivisions Debt Securities    
Assets, Fair Value Disclosure, Recurring 58,158 67,837
Interest rate derivative asset    
Assets, Fair Value Disclosure, Recurring 1,360 1,663
Interest rate derivative liability    
Assets, Fair Value Disclosure, Recurring (1,441) (1,699)
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 125,810 146,035
Fair Value, Inputs, Level 2 | US States and Political Subdivisions Debt Securities    
Assets, Fair Value Disclosure, Recurring 58,158 67,837
Fair Value, Inputs, Level 2 | Interest rate derivative asset    
Assets, Fair Value Disclosure, Recurring 1,360 1,663
Fair Value, Inputs, Level 2 | Interest rate derivative liability    
Assets, Fair Value Disclosure, Recurring (1,441) (1,699)
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