XML 103 R87.htm IDEA: XBRL DOCUMENT
v3.3.1.900

Estimated Fair Values Estimated Fair Values (Fair Value Option) (Details) - Loans Held For Sale - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Fair Value, Option, Quantitative Disclosures [Line Items] |  |
Fair Value, Option, Changes in Fair Value, Gain (Loss) | $ 176 | $ 202
Fair Value Of Items For Which Fair Value Option Was Elected Assets | 59,766 | 63,696
Aggregate Unpaid Principal Balance Of Items For Which Fair Value Option Was Elected Assets | 58,890 | 62,996
Fair Value Option Aggregate Difference Assets | $ 876 | $ 700

X
- 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

X
- 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

X
- 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

X
- 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

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueOptionQuantitativeDisclosuresLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_EligibleItemOrGroupForFairValueOptionAxis=fcnca_LoansHeldForSaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |