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Note 2: Investments in Debt and Equity Securities: Mortgage-backed securities portfolio (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Variable Rate Of Interest  
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure $ 238,100us-gaap_MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure
/ us-gaap_FinancialInstrumentAxis
= fil_VariableRateOfInterestMember
Fixed Rate Of Interest  
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure 19,700us-gaap_MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure
/ us-gaap_FinancialInstrumentAxis
= fil_FixedRateOfInterestMember
Government National Mortgage Association Certificates and Obligations (GNMA)  
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure 186,400us-gaap_MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Federal National Mortgage Association Certificates and Obligations (FNMA)  
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure 37,100us-gaap_MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Federal Home Loan Mortgage Corporation Certificates and Obligations (FHLMC)  
Mortgage-backed Securities Available-for-sale, Fair Value Disclosure $ 34,300us-gaap_MortgageBackedSecuritiesAvailableForSaleFairValueDisclosure
/ us-gaap_InvestmentTypeAxis
= us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember