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v2.4.1.9

Commitments and Contingencies (Details) (USD $) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2014 | Dec. 31, 2013
Guarantor Obligations [Line Items] |  |  |  |
FDIC Indemnification Asset | 21,340,000 us-gaap_FDICIndemnificationAsset | $ 28,701,000 us-gaap_FDICIndemnificationAsset | $ 74,784,000 us-gaap_FDICIndemnificationAsset | $ 93,397,000 us-gaap_FDICIndemnificationAsset
FDIC loss share payable | 118,645,000 fcnca_PayableToFdicForLossShareAgreements | 116,535,000 fcnca_PayableToFdicForLossShareAgreements |  |
Commitments to Extend Credit |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Unused Commitments to Extend Credit | 7,570,000,000 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_CommitmentsToExtendCreditMember | 7,190,000,000 us-gaap_UnusedCommitmentsToExtendCredit / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_CommitmentsToExtendCreditMember |  |
Affordable housing program obligation | 22,600,000 fcnca_UnfundedCommitmentforLowIncomeHousingTaxCredits / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_CommitmentsToExtendCreditMember | 16,800,000 fcnca_UnfundedCommitmentforLowIncomeHousingTaxCredits / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_CommitmentsToExtendCreditMember |  |
Standby Letters of Credit |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |
Guarantor obligations amount | 75,000,000 us-gaap_GuaranteeObligationsMaximumExposure / us-gaap_GuaranteeObligationsByNatureAxis = us-gaap_StandbyLettersOfCreditMember | 77,400,000 us-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 | 3,100,000 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ObligationToRepurchaseReceivablesSoldMember | $ 3,200,000 us-gaap_LossContingencyAccrualAtCarryingValue / us-gaap_LossContingenciesByNatureOfContingencyAxis = us-gaap_ObligationToRepurchaseReceivablesSoldMember |  |

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

X
- Definition Recourse Period Maximum1 + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- 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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Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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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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- Definition Unused amount of commitments to extend credit to customers. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Details
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- Details
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- Details
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- Details
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