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Estimated Fair Values (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Estimated Fair Values [Line Items] |  |
Investment securities available for sale | $ 7,171,917us-gaap_AvailableForSaleSecurities | $ 5,387,703us-gaap_AvailableForSaleSecurities
Liability transfers between Level 1 and Level 2 | 0us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount | 0us-gaap_FairValueLiabilitiesLevel1ToLevel2TransfersAmount
Asset transfers between Level 1 and Level 2 | 0us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount | 0us-gaap_FairValueAssetsLevel1ToLevel2TransfersAmount
Liability transfers between Level 2 and Level 1 | 0us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount | 0us-gaap_FairValueLiabilitiesLevel2ToLevel1TransfersAmount
Asset transfers between Level 2 and Level 1 | 0us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount | 0us-gaap_FairValueAssetsLevel2ToLevel1TransfersAmount
Fair value of investment securities with nonobservable inputs | 0us-gaap_InvestmentsFairValueDisclosure | 0us-gaap_InvestmentsFairValueDisclosure
Fair Value, Measurements, Recurring |  |
Estimated Fair Values [Line Items] |  |
Liability measured at fair value on nonrecurring basis | 0us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 0us-gaap_LiabilitiesFairValueDisclosure / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 3 |  |
Estimated Fair Values [Line Items] |  |
Investment securities available for sale | 0us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | 0us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Fair Value, Measurements, Recurring | Fair Value |  |
Estimated Fair Values [Line Items] |  |
Investment securities available for sale | $ 7,171,917us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember | $ 5,387,703us-gaap_AvailableForSaleSecurities / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_EstimateOfFairValueFairValueDisclosureMember / us-gaap_FairValueByMeasurementFrequencyAxis = us-gaap_FairValueMeasurementsRecurringMember
Minimum |  |
Estimated Fair Values [Line Items] |  |
Discounts for collateral value estimates due to estimated holding and selling costs (percent) | 10.00%fcnca_DiscountsForCollateralValueEstimatesDueToEstimatedHoldingAndSellingCostsPercent / us-gaap_RangeAxis = us-gaap_MinimumMember | 10.00%fcnca_DiscountsForCollateralValueEstimatesDueToEstimatedHoldingAndSellingCostsPercent / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum |  |
Estimated Fair Values [Line Items] |  |
Discounts for collateral value estimates due to estimated holding and selling costs (percent) | 14.00%fcnca_DiscountsForCollateralValueEstimatesDueToEstimatedHoldingAndSellingCostsPercent / us-gaap_RangeAxis = us-gaap_MaximumMember | 14.00%fcnca_DiscountsForCollateralValueEstimatesDueToEstimatedHoldingAndSellingCostsPercent / us-gaap_RangeAxis = us-gaap_MaximumMember

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of assets measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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