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Estimated Fair Values Estimated Fair Values (Fair Value Option) (Details) (Loans Held For Sale, USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Loans Held For Sale |
Fair Value, Option, Quantitative Disclosures [Line Items] |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | $ 202us-gaap_FairValueOptionChangesInFairValueGainLoss1 / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = fcnca_LoansHeldForSaleMember
Fair Value Of Items For Which Fair Value Option Was Elected Assets | 63,696fcnca_FairValueOfItemsForWhichFairValueOptionWasElectedAssets / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = fcnca_LoansHeldForSaleMember
Aggregate Unpaid Principal Balance Of Items For Which Fair Value Option Was Elected Assets | 62,996fcnca_AggregateUnpaidPrincipalBalanceOfItemsForWhichFairValueOptionWasElectedAssets / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = fcnca_LoansHeldForSaleMember
Fair Value Option Aggregate Difference Assets | $ 700fcnca_FairValueOptionAggregateDifferenceAssets / us-gaap_EligibleItemOrGroupForFairValueOptionAxis = fcnca_LoansHeldForSaleMember

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- Definition Represents the aggregate unpaid principal balance of assets for which the fair value option was elected. + References No definition available. + Details
Name: | fcnca_AggregateUnpaidPrincipalBalanceOfItemsForWhichFairValueOptionWasElectedAssets
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the fair value of assets for which the fair value option was elected. + References No definition available. + Details
Name: | fcnca_FairValueOfItemsForWhichFairValueOptionWasElectedAssets
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition For assets for which the fair value option has been elected, this item represents the difference between the fair value and the aggregate unpaid principal balance for those assets. + References No definition available. + Details
Name: | fcnca_FairValueOptionAggregateDifferenceAssets
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6957238&loc=d3e14172-108612 + Details
Name: | us-gaap_FairValueOptionChangesInFairValueGainLoss1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
Name: | us-gaap_FairValueOptionQuantitativeDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration