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Note 2: Investments in Debt and Equity Securities: Other-than-temporary Impairment Policy (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011
Nonagency Collateralized Mortgage Obligations Book Value Other than Temporary Impairment | $ 680 | $ 1,800
Nonagency Collateralized Mortgage Obligations Pre-Tax Charge to Income | $ 680 | $ 615

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