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Note 6: Investment Securities: Schedule of Gross Unrealized Losses and Estimated Fair Value of Investments (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Total Unrealized Losses and Estimated Fair Value
    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 215,816 $ 106,136
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses3 (3,241) (814)
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1 414
AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses3   (8)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 215,817 106,550
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses3 (3,241) (822)
Collateralized Mortgage Obligations
    
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value   414
AvailableforsaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses3   (8)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   414
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses3   (8)
U.S. Government Agency Residential Mortgage-Backed Securities
    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value   106,136
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses3   (814)
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value   106,136
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses3   (814)
US Government Agencies Debt Securities
    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 20,000  
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses3 (856)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 20,000  
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses3 (856)  
Mortgage-backed Securities, Issued by US Government Sponsored Enterprises
    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 163,381  
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses3 (1,647)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 163,382  
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses3 (1,647)  
US States and Political Subdivisions Debt Securities
    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value 32,435  
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAggregateLosses3 (738)  
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 32,435  
AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAggregateLosses3 $ (738)