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Commitments and Contingencies (Details) (USD $) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Guarantor Obligations [Line Items] |  |  |  |
FDIC loss share receivable | 28,701,000us-gaap_FDICIndemnificationAsset | $ 93,397,000us-gaap_FDICIndemnificationAsset | $ 270,192,000us-gaap_FDICIndemnificationAsset | $ 617,377,000us-gaap_FDICIndemnificationAsset
FDIC loss share payable | 116,535,000fcnca_PayableToFdicForLossShareAgreements | 109,378,000fcnca_PayableToFdicForLossShareAgreements |  |
Commitments to Extend Credit |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Unused commitments | 7,190,000,000fcnca_UnusedCommitments / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_CommitmentsToExtendCreditMember | 5,840,000,000fcnca_UnusedCommitments / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_CommitmentsToExtendCreditMember |  |
Affordable Housing Program Obligation | 16,800,000fcnca_UnfundedCommitmentforLowIncomeHousingTaxCredits / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_CommitmentsToExtendCreditMember | 19,800,000fcnca_UnfundedCommitmentforLowIncomeHousingTaxCredits / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_CommitmentsToExtendCreditMember |  |
Standby Letters of Credit |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Guarantor obligations amount | 77,374,000us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_StandbyLettersOfCreditMember | 54,811,000us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_StandbyLettersOfCreditMember |  |
Recourse Obligation on Mortgage Loans Sold |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Recourse Period, Maximum1 | 120 days |  |  |
Obligation to Repurchase Receivables Sold |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Reserve for estimated losses arising from repurchase of loans | 3,203,000us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ObligationToRepurchaseReceivablesSoldMember | $ 3,641,000us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ObligationToRepurchaseReceivablesSoldMember |  |

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- Definition Payable to FDIC for Loss Share Agreements + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Recourse Period Maximum1 + References No definition available. + Details
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Balance Type: | na
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- Definition Represents the liability related to investments in low income housing tax credits which is reflected in other liabilities on the Consolidated Balance Sheet. + References No definition available. + Details
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- Definition Unused Commitments + References No definition available. + Details
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- Definition Carrying amount of receivable assets originating from the indemnification agreement with the Federal Deposit Insurance Corporation (FDIC), in which the FDIC is to partially cover losses. + References No definition available. + Details
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- Details
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- Definition Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
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- Definition Amount of loss contingency liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349 + Details
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- Details
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