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Note 12: Fair Value Measurement: Fair Value, Assets Measured on Recurring Basis (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
US Government Agencies Debt Securities
    
Fair Value Measured on Recurring Basis $ 19,144 $ 30,040
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
    
Fair Value Measured on Recurring Basis 557,790 596,086
Small Business Administration loan pools
    
Fair Value Measured on Recurring Basis 49,548 51,493
US States and Political Subdivisions Debt Securities
    
Fair Value Measured on Recurring Basis 115,483 122,878
Equity Securities
    
Fair Value Measured on Recurring Basis 2,474 2,006
Mortgage servicing rights
    
Fair Value Measured on Recurring Basis 246 152
Interest rate swap asset
    
Fair Value Measured on Recurring Basis 1,379 2,112
Interest rate swap liability
    
Fair Value Measured on Recurring Basis (1,019) (2,160)
Collateralized Mortgage Obligations
    
Fair Value Measured on Recurring Basis   4,507
Fair Value, Inputs, Level 2 | US Government Agencies Debt Securities
    
Fair Value Measured on Recurring Basis 19,144 30,040
Fair Value, Inputs, Level 2 | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
    
Fair Value Measured on Recurring Basis 557,790 596,086
Fair Value, Inputs, Level 2 | Small Business Administration loan pools
    
Fair Value Measured on Recurring Basis 49,548 51,493
Fair Value, Inputs, Level 2 | US States and Political Subdivisions Debt Securities
    
Fair Value Measured on Recurring Basis 115,483 122,878
Fair Value, Inputs, Level 2 | Equity Securities
    
Fair Value Measured on Recurring Basis 2,474 2,006
Fair Value, Inputs, Level 2 | Collateralized Mortgage Obligations
    
Fair Value Measured on Recurring Basis   4,507
Fair Value, Inputs, Level 3 | Mortgage servicing rights
    
Fair Value Measured on Recurring Basis 246 152
Fair Value, Inputs, Level 3 | Interest rate swap asset
    
Fair Value Measured on Recurring Basis 1,379 2,112
Fair Value, Inputs, Level 3 | Interest rate swap liability
    
Fair Value Measured on Recurring Basis $ (1,019) $ (2,160)