Note 12: Fair Value Measurement: Fair Value, Assets Measured on Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
US Government Agencies Debt Securities
Fair Value Measured on Recurring Basis	$ 17,830	$ 30,040
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Fair Value Measured on Recurring Basis	393,893	596,086
SmallBusinessAdministrationLoanPoolsMember
Fair Value Measured on Recurring Basis	47,128	51,493
US States and Political Subdivisions Debt Securities
Fair Value Measured on Recurring Basis	119,558	122,878
Equity Securities
Fair Value Measured on Recurring Basis	2,572	2,006
MortgageServicingRightsMember
Fair Value Measured on Recurring Basis	236	152
InterestRateDerivativeAssetMember
Fair Value Measured on Recurring Basis	2,230	2,112
InterestRateSwapLiabilityMember
Fair Value Measured on Recurring Basis	(1,326)	(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	17,830	30,040
Fair Value, Inputs, Level 2 | Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
Fair Value Measured on Recurring Basis	393,893	596,086
Fair Value, Inputs, Level 2 | SmallBusinessAdministrationLoanPoolsMember
Fair Value Measured on Recurring Basis	47,128	51,493
Fair Value, Inputs, Level 2 | US States and Political Subdivisions Debt Securities
Fair Value Measured on Recurring Basis	119,558	122,878
Fair Value, Inputs, Level 2 | Equity Securities
Fair Value Measured on Recurring Basis	2,572	2,006
Fair Value, Inputs, Level 2 | Collateralized Mortgage Obligations
Fair Value Measured on Recurring Basis		4,507
Fair Value, Inputs, Level 3 | MortgageServicingRightsMember
Fair Value Measured on Recurring Basis	236	152
Fair Value, Inputs, Level 3 | InterestRateDerivativeAssetMember
Fair Value Measured on Recurring Basis	2,230	2,112
Fair Value, Inputs, Level 3 | InterestRateSwapLiabilityMember
Fair Value Measured on Recurring Basis	$ (1,326)	$ (2,160)