XML 85 R56.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Investments (Narrative) (Details) shares in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 01, 2019 USD ($) | May 01, 2018 USD ($) | Dec. 31, 2019 USD ($) investments investment | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($)
Schedule of Investments [Line Items] |  |  |  |  |
Investment securities available for sale transferred to held to maturity fair value, net of tax |  | $ 109,500,000 | $ 72,512,000 | $ (109,507,000) | $ 0
Reclassification of unrealized losses, net of tax |  | 84,300,000 | $ 71,149,000 | (71,149,000) | $ 0
Number of investments in continuous unrealized loss position for more than twelve months | investment |  |  | 91 |  |
Unrealized losses related to marketability of securities or issuers ability to honor redemption obligations |  |  | $ 0 |  |
Investment value deemed to be OTTI |  |  | 0 |  |
Investment securities, aggregate carrying value, pledged as collateral |  |  | $ 3,930,000,000 | $ 4,030,000,000.00 |
Visa Class B Common Stock |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investment owned (in shares) | shares |  |  |  | 298 |
Investment owned, fair value |  |  |  | $ 0 |
Mortgage Backed Securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Investment securities available for sale transferred to held to maturity fair value |  | 2,380,000,000 |  |  |
Investment securities available for sale transferred to held to maturity amortized cost |  | $ 2,490,000,000 |  |  |
Weighted average contractual maturity (years) |  | 13 years |  |  |
Available-for-sale, securities in unrealized loss positions, number of positions, greater than or equal to on year | investments |  |  | 90 |  |
Corporate Bonds |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Available-for-sale, securities in unrealized loss positions, number of positions, greater than or equal to on year | investments |  |  | 1 |  |
Accounting Standards Update 2019-04 | Mortgage Backed Securities |  |  |  |  |
Schedule of Investments [Line Items] |  |  |  |  |
Mortgage backed securities, held-to-maturity, transferred to available-for-sale | $ 2,080,000,000.00 |  |  |  |
Investment securities available for sale transferred to held to maturity fair value | 2,150,000,000 |  |  |  |
Investment securities available for sale transferred to held to maturity fair value, net of tax | 72,500,000 |  |  |  |
Reclassification of unrealized losses, net of tax | $ 55,800,000 |  |  |  |

X
- Definition Investment securities available for sale transferred to held to maturity amortized cost at date of transfer. + References No definition available. + Details
Name: | fcnca_Investmentsecuritiesavailableforsaletransferredtoheldtomaturityamortizedcost
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Investment securities available for sale transferred to held to maturity fair value at date of transfer. + References No definition available. + Details
Name: | fcnca_Investmentsecuritiesavailableforsaletransferredtoheldtomaturityfairvalue
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Mortgage Back Securities, Held-To-Maturity, Reclassified To Available-For-Sale + References No definition available. + Details
Name: | fcnca_MortgageBackSecuritiesHeldToMaturityReclassifiedToAvailableForSale
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Mortgage Backed Securities, Available-For-Sale, Weighted Average Term + References No definition available. + Details
Name: | fcnca_MortgageBackedSecuritiesAvailableForSaleWeightedAverageTerm
Namespace Prefix: | fcnca_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Other Comprehensive Income Loss Unrealized Losses On Securities Available For Sale Transferred To Held To Maturity Arising During Period Before Tax + References No definition available. + Details
Name: | fcnca_OtherComprehensiveIncomeLossUnrealizedLossesOnSecuritiesAvailableForSaleTransferredToHeldToMaturityArisingDuringPeriodBeforeTax
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Other Comprehensive Income Loss Unrealized Losses On Securities Available For Sale Transferred To Held To Maturity Arising During Period Net Of Tax + References No definition available. + Details
Name: | fcnca_OtherComprehensiveIncomeLossUnrealizedLossesOnSecuritiesAvailableForSaleTransferredToHeldToMaturityArisingDuringPeriodNetOfTax
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Unrealized Losses Related to Marketability of Securities or Issuer's Ability to Honor Redemption Obligations + References No definition available. + Details
Name: | fcnca_UnrealizedLossesRelatedtoMarketabilityofSecuritiesorIssuersAbilitytoHonorRedemptionObligations
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
Name: | us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References No definition available. + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerNumberOfPositions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 8A -URI http://asc.fasb.org/extlink&oid=109979856&loc=SL6284422-111562 + Details
Name: | us-gaap_ImpairmentOfInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Value of the investment at close of period. For schedules of investments that are categorized, the value would be aggregated by category. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column C.7) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.Column E.2,3) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.Column C.3,4) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 5 -Subparagraph (SX 210.12-13.Column C.6) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611282-123010 + Details
Name: | us-gaap_InvestmentOwnedAtFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Balance held at close of period in number of shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 210 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=99383244&loc=d3e12121-115841 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 6 -Subparagraph (SX 210.12-14.Column B) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611322-123010 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-12C.Column B) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611225-123010 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-12.Column B) -URI http://asc.fasb.org/extlink&oid=50485924&loc=d3e611133-123010 + Details
Name: | us-gaap_InvestmentOwnedBalanceShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Sum of the carrying amounts as of the date of the latest financial statement presented of securities which are owned but transferred to another party to serve as collateral to partially or fully secure a debt obligation, repurchase agreement or other current or potential obligation, and for which the transferee is not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=109249958&loc=SL6224234-111729 + Details
Name: | us-gaap_PledgedFinancialInstrumentsNotSeparatelyReportedSecuritiesPledged
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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_ScheduleOfInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=fcnca_VisaClassBCommonStockMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_MortgageBackedSecuritiesOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AdjustmentsForNewAccountingPronouncementsAxis=fcnca_AccountingStandardsUpdate201904Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |