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Fair Value Measurements Financial Instruments not Carried at Fair Value (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fixed maturities held-to-maturity, fair value $ 232,891us-gaap_HeldToMaturitySecuritiesFairValue $ 223,533us-gaap_HeldToMaturitySecuritiesFairValue    
Mortgage loans 628us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet 671us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet    
Policy loans 54,032us-gaap_LoansInsurancePolicy 48,868us-gaap_LoansInsurancePolicy    
Cash and cash equivalents, at carrying value 50,708us-gaap_CashAndCashEquivalentsAtCarryingValue 54,593us-gaap_CashAndCashEquivalentsAtCarryingValue 56,299us-gaap_CashAndCashEquivalentsAtCarryingValue 33,255us-gaap_CashAndCashEquivalentsAtCarryingValue
Liability for future policy benefits individual and group annuities 59,727cia_LiabilityForFuturePolicyBenefitsIndividualAndGroupAnnuities 55,485cia_LiabilityForFuturePolicyBenefitsIndividualAndGroupAnnuities    
Mortgage loans on real estate, interest rate 6.30%us-gaap_MortgageLoansOnRealEstateInterestRate 6.40%us-gaap_MortgageLoansOnRealEstateInterestRate    
Mortgage loan maturity lower end range 2 years      
Mortgage loan maturity higher end range 29 years      
Mortgage loans interest rate used to estimate fair value 6.25%cia_MortgageLoansInterestRateUsedToEstimateFairValue 6.25%cia_MortgageLoansInterestRateUsedToEstimateFairValue    
Insurance policy loans interest rate 7.70%cia_InsurancePolicyLoansInterestRate 7.70%cia_InsurancePolicyLoansInterestRate    
Fair value minimum interest rate of investment contract 0.10%cia_FairValueMinimumInterestRateOfInvestmentContract      
Fair value maximum rate of investment contract 3.80%cia_FairValueMaximumRateOfInvestmentContract      
Carrying (Reported) Amount, Fair Value Disclosure [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fixed maturities held-to-maturity, fair value 224,932us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
227,696us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Mortgage loans 628us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
671us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Policy loans 54,032us-gaap_LoansInsurancePolicy
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
48,868us-gaap_LoansInsurancePolicy
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Short-term investments 0us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
0us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Cash and cash equivalents, at carrying value 50,708us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
54,593us-gaap_CashAndCashEquivalentsAtCarryingValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Liability for future policy benefits individual and group annuities 42,837cia_LiabilityForFuturePolicyBenefitsIndividualAndGroupAnnuities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
39,469cia_LiabilityForFuturePolicyBenefitsIndividualAndGroupAnnuities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_CarryingReportedAmountFairValueDisclosureMember
   
Estimate of Fair Value, Fair Value Disclosure [Member]        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Fixed maturities held-to-maturity, fair value 232,891us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
223,533us-gaap_HeldToMaturitySecuritiesFairValue
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Mortgage loans 652us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
695us-gaap_MortgageLoansOnRealEstateCommercialAndConsumerNet
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Policy loans 54,032us-gaap_LoansInsurancePolicy
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
48,868us-gaap_LoansInsurancePolicy
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Short-term investments 0us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
0us-gaap_OtherShortTermInvestments
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Cash and cash equivalents, fair value disclosure 50,708us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
54,593us-gaap_CashAndCashEquivalentsFairValueDisclosure
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
   
Liability for future policy benefits individual and group annuities $ 37,978cia_LiabilityForFuturePolicyBenefitsIndividualAndGroupAnnuities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember
$ 44,960cia_LiabilityForFuturePolicyBenefitsIndividualAndGroupAnnuities
/ us-gaap_FairValueByMeasurementBasisAxis
= us-gaap_EstimateOfFairValueFairValueDisclosureMember