XML 78 R67.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Estimated Fair Values (Fair Value Option) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Gains (Losses) from fair value changes on originated loans held for sale | $ 700 | $ 291 | $ 245 | $ 3,452 |
Loans Held For Sale |  |  |  |  |
Fair Value, Option, Quantitative Disclosures [Line Items] |  |  |  |  |
Fair value of originated loans held for sale | 58,961 |  | 58,961 |  | $ 51,179
Aggregate unpaid principle balance of originated loans held for sale | 57,334 |  | 57,334 |  | 49,796
Difference between fair value and aggregate unpaid principle balance of originated loans held for sale | $ 1,627 |  | $ 1,627 |  | $ 1,383

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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&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_FinancialInstrumentAxis=fcnca_LoansHeldForSaleMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |