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Note 2. Investment Securities: Realized Gain (Loss) on Investments (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Available for sale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments $ 7,637us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments $ 17,841us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments $ 5,352us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments
Trading Securities, Realized Gain (Loss) 506us-gaap_TradingSecuritiesRealizedGainLoss 1,619us-gaap_TradingSecuritiesRealizedGainLoss 79us-gaap_TradingSecuritiesRealizedGainLoss
Marketable Securities, Realized Gain (Loss), Excluding Other than Temporary Impairments 8,143us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments 19,460us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments 5,431us-gaap_MarketableSecuritiesRealizedGainLossExcludingOtherThanTemporaryImpairments
Available for sale Securities Transfers To Trading Gains Losses Excluding Other Than Temporary Impairments     138us-gaap_AvailableforsaleSecuritiesTransfersToTradingGainsLossesExcludingOtherThanTemporaryImpairments
Trading Securities, Change in Unrealized Holding Gain (Loss) (451)us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss 94us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss (26)us-gaap_TradingSecuritiesUnrealizedHoldingGainLoss
Marketable Securities, Unrealized Gain (Loss), Excluding Other than Temporary Impairments (451)us-gaap_MarketableSecuritiesUnrealizedGainLossExcludingOtherThanTemporaryImpairments 94us-gaap_MarketableSecuritiesUnrealizedGainLossExcludingOtherThanTemporaryImpairments 112us-gaap_MarketableSecuritiesUnrealizedGainLossExcludingOtherThanTemporaryImpairments
Gain (Loss) on Sale of Other Investments (4)us-gaap_GainLossOnSaleOfOtherInvestments 196us-gaap_GainLossOnSaleOfOtherInvestments (444)us-gaap_GainLossOnSaleOfOtherInvestments
Net realized investment gains 7,688us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments 19,750us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments 5,099us-gaap_GainLossOnInvestmentsExcludingOtherThanTemporaryImpairments
Debt Securities      
Available for sale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments 7,642us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
17,664us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
5,428us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_DebtSecuritiesMember
COMMON STOCK      
Available for sale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments (5)us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
  419us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_CommonStockMember
Preferred Stock      
Available for sale Securities Gross Realized Gain Loss Excluding Other Than Temporary Impairments   $ 177us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_PreferredStockMember
$ (495)us-gaap_AvailableforsaleSecuritiesGrossRealizedGainLossExcludingOtherThanTemporaryImpairments
/ us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis
= us-gaap_PreferredStockMember