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Note 14: Fair Value Measurement: Fair Value, Assets Measured on Recurring Basis (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
US Government Agencies Debt Securities
    
Fair Value Measured on Recurring Basis $ 18,821 $ 17,255
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
    
Fair Value Measured on Recurring Basis 377,843 367,578
Collateralized Mortgage Obligations
    
Fair Value Measured on Recurring Basis 39,750  
US States and Political Subdivisions Debt Securities
    
Fair Value Measured on Recurring Basis 129,646 122,724
Equity Securities
    
Fair Value Measured on Recurring Basis 2,970 2,869
Mortgage Servicing Rights
    
Fair Value Measured on Recurring Basis 196 211
Interest Rate Swap Asset
    
Fair Value Measured on Recurring Basis 2,184 2,544
Interest Rate Swap Liability
    
Fair Value Measured on Recurring Basis (1,711) (1,613)
Small Business Administration Loan Pools
    
Fair Value Measured on Recurring Basis   44,855
Fair Value, Inputs, Level 2 | US Government Agencies Debt Securities
    
Fair Value Measured on Recurring Basis 18,821 17,255
Fair Value, Inputs, Level 2 | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
    
Fair Value Measured on Recurring Basis 377,843 367,578
Fair Value, Inputs, Level 2 | Collateralized Mortgage Obligations
    
Fair Value Measured on Recurring Basis 39,750  
Fair Value, Inputs, Level 2 | US States and Political Subdivisions Debt Securities
    
Fair Value Measured on Recurring Basis 129,646 122,724
Fair Value, Inputs, Level 2 | Equity Securities
    
Fair Value Measured on Recurring Basis 2,970 2,869
Fair Value, Inputs, Level 2 | Small Business Administration Loan Pools
    
Fair Value Measured on Recurring Basis   44,855
Fair Value, Inputs, Level 3 | Mortgage Servicing Rights
    
Fair Value Measured on Recurring Basis 196 211
Fair Value, Inputs, Level 3 | Interest Rate Swap Asset
    
Fair Value Measured on Recurring Basis 2,184 2,544
Fair Value, Inputs, Level 3 | Interest Rate Swap Liability
    
Fair Value Measured on Recurring Basis $ (1,711) $ (1,613)