Note 15: Disclosures About Fair Value of Financial Instruments: Fair Value, Assets Measured on Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
US Government Agencies Debt Securities
Assets, Fair Value Disclosure, Recurring	$ 19,514	$ 17,255
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Assets, Fair Value Disclosure, Recurring	257,798	367,578
US States and Political Subdivisions Debt Securities
Assets, Fair Value Disclosure, Recurring	85,040	122,724
Equity Securities
Assets, Fair Value Disclosure, Recurring	3,154	2,869
Mortgage Servicing Rights
Assets, Fair Value Disclosure, Recurring	185	211
Interest Rate Derivative Asset
Assets, Fair Value Disclosure, Recurring	2,502	2,544
Interest Rate Derivative Liability
Assets, Fair Value Disclosure, Recurring	(2,187)	(1,613)
Small Business Administration Loan Pools
Assets, Fair Value Disclosure, Recurring		44,855
Fair Value, Inputs, Level 2 | US Government Agencies Debt Securities
Assets, Fair Value Disclosure, Recurring	19,514	17,255
Fair Value, Inputs, Level 2 | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Assets, Fair Value Disclosure, Recurring	257,798	367,578
Fair Value, Inputs, Level 2 | US States and Political Subdivisions Debt Securities
Assets, Fair Value Disclosure, Recurring	85,040	122,724
Fair Value, Inputs, Level 2 | Equity Securities
Assets, Fair Value Disclosure, Recurring	3,154	2,869
Fair Value, Inputs, Level 2 | Small Business Administration Loan Pools
Assets, Fair Value Disclosure, Recurring		44,855
Fair Value, Inputs, Level 3 | Mortgage Servicing Rights
Assets, Fair Value Disclosure, Recurring	185	211
Fair Value, Inputs, Level 3 | Interest Rate Derivative Asset
Assets, Fair Value Disclosure, Recurring	2,502	2,544
Fair Value, Inputs, Level 3 | Interest Rate Derivative Liability
Assets, Fair Value Disclosure, Recurring	$ (2,187)	$ (1,613)