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Mortgage Servicing Rights Mortgage Servicing Rights (Economic Assumptions) (Details) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2015 Rate | Dec. 31, 2014 Rate
Servicing Asset Key Economic Assumptions [Line Items] |  |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed | 16.07%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed | 14.25%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValuePrepaymentSpeed
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Cost to Service Loans | 56,020.00 fcnca_ServicingAssetsandServicingLiabilitiesatFairValueAssumptionsUsedtoEstimateFairValueCosttoServiceLoans | 56,020.00 fcnca_ServicingAssetsandServicingLiabilitiesatFairValueAssumptionsUsedtoEstimateFairValueCosttoServiceLoans
Conventional fixed loans |  |
Servicing Asset Key Economic Assumptions [Line Items] |  |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate | 6.95%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FixedRateResidentialMortgageMember | 7.20%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_FixedRateResidentialMortgageMember
All loans excluding conventional fixed loans |  |
Servicing Asset Key Economic Assumptions [Line Items] |  |
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate | 8.95%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcnca_AllLoansandLeasesExcludingConventionalFixedLoansMember | 9.20%us-gaap_ServicingAssetsAndServicingLiabilitiesAtFairValueAssumptionsUsedToEstimateFairValueDiscountRate / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = fcnca_AllLoansandLeasesExcludingConventionalFixedLoansMember

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- Definition Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Cost to Service Loans + References No definition available. + Details
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- Definition Discount rate used to estimate the fair value of servicing assets and servicing liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122596-111746 + Details
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- Definition Estimated rate of prepayments of principal on servicing assets and servicing liabilities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122596-111746 + Details
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