XML 79 R68.htm IDEA: XBRL DOCUMENT
v3.24.2.u1

LOANS AND LEASES - Schedule of Loans and Leases Delinquency Status (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | $ 139,341 | $ 133,302 | $ 133,015
Total Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 1,411 | 1,550 |
30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 518 | 606 |
60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 203 | 329 |
90 Days or Greater |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 690 | 615 |
Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 137,930 | 131,752 |
Commercial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 69,030 | 66,232 |
Commercial | Total Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 1,008 | 1,135 |
Commercial | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 346 | 396 |
Commercial | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 93 | 270 |
Commercial | 90 Days or Greater |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 569 | 469 |
Commercial | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 68,022 | 65,097 |
Commercial | Commercial construction |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 4,484 | 3,918 |
Commercial | Commercial construction | Total Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 74 | 53 |
Commercial | Commercial construction | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 74 | 43 |
Commercial | Commercial construction | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 0 | 8 |
Commercial | Commercial construction | 90 Days or Greater |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 0 | 2 |
Commercial | Commercial construction | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 4,410 | 3,865 |
Commercial | Owner occupied commercial mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 16,233 | 15,471 |
Commercial | Owner occupied commercial mortgage | Total Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 95 | 78 |
Commercial | Owner occupied commercial mortgage | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 52 | 21 |
Commercial | Owner occupied commercial mortgage | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 14 | 10 |
Commercial | Owner occupied commercial mortgage | 90 Days or Greater |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 29 | 47 |
Commercial | Owner occupied commercial mortgage | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 16,138 | 15,393 |
Commercial | Non-owner occupied commercial mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 15,580 | 14,995 |
Commercial | Non-owner occupied commercial mortgage | Total Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 480 | 571 |
Commercial | Non-owner occupied commercial mortgage | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 66 | 100 |
Commercial | Non-owner occupied commercial mortgage | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 2 | 188 |
Commercial | Non-owner occupied commercial mortgage | 90 Days or Greater |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 412 | 283 |
Commercial | Non-owner occupied commercial mortgage | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 15,100 | 14,424 |
Commercial | Commercial and industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 30,684 | 29,794 |
Commercial | Commercial and industrial | Total Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 292 | 342 |
Commercial | Commercial and industrial | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 111 | 177 |
Commercial | Commercial and industrial | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 64 | 49 |
Commercial | Commercial and industrial | 90 Days or Greater |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 117 | 116 |
Commercial | Commercial and industrial | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 30,392 | 29,452 |
Commercial | Leases |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 2,049 | 2,054 |
Commercial | Leases | Total Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 67 | 91 |
Commercial | Leases | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 43 | 55 |
Commercial | Leases | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 13 | 15 |
Commercial | Leases | 90 Days or Greater |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 11 | 21 |
Commercial | Leases | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 1,982 | 1,963 |
Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 28,343 | 27,559 |
Consumer | Total Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 327 | 300 |
Consumer | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 170 | 168 |
Consumer | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 61 | 42 |
Consumer | 90 Days or Greater |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 96 | 90 |
Consumer | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 28,016 | 27,259 |
Consumer | Residential mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 23,101 | 22,776 |
Consumer | Residential mortgage | Total Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 271 | 242 |
Consumer | Residential mortgage | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 142 | 136 |
Consumer | Residential mortgage | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 50 | 33 |
Consumer | Residential mortgage | 90 Days or Greater |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 79 | 73 |
Consumer | Residential mortgage | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 22,830 | 22,534 |
Consumer | Revolving mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 2,351 | 2,165 |
Consumer | Revolving mortgage | Total Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 31 | 29 |
Consumer | Revolving mortgage | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 15 | 15 |
Consumer | Revolving mortgage | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 5 | 3 |
Consumer | Revolving mortgage | 90 Days or Greater |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 11 | 11 |
Consumer | Revolving mortgage | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 2,320 | 2,136 |
Consumer | Consumer auto |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 1,503 | 1,442 |
Consumer | Consumer auto | Total Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 14 | 14 |
Consumer | Consumer auto | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 9 | 9 |
Consumer | Consumer auto | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 3 | 3 |
Consumer | Consumer auto | 90 Days or Greater |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 2 | 2 |
Consumer | Consumer auto | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 1,489 | 1,428 |
Consumer | Consumer other |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 1,388 | 1,176 |
Consumer | Consumer other | Total Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 11 | 15 |
Consumer | Consumer other | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 4 | 8 |
Consumer | Consumer other | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 3 | 3 |
Consumer | Consumer other | 90 Days or Greater |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 4 | 4 |
Consumer | Consumer other | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 1,377 | 1,161 |
SVB |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 41,968 | 39,511 |
SVB | Total Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 76 | 115 |
SVB | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 2 | 42 |
SVB | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 49 | 17 |
SVB | 90 Days or Greater |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 25 | 56 |
SVB | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 41,892 | 39,396 |
SVB | Global fund banking |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 28,915 | 25,553 |
SVB | Global fund banking | Total Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 0 | 0 |
SVB | Global fund banking | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 0 | 0 |
SVB | Global fund banking | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 0 | 0 |
SVB | Global fund banking | 90 Days or Greater |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 0 | 0 |
SVB | Global fund banking | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 28,915 | 25,553 |
SVB | Investor dependent - early stage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 1,179 | 1,403 |
SVB | Investor dependent - early stage | Total Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 11 | 31 |
SVB | Investor dependent - early stage | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 2 | 10 |
SVB | Investor dependent - early stage | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 2 | 12 |
SVB | Investor dependent - early stage | 90 Days or Greater |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 7 | 9 |
SVB | Investor dependent - early stage | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 1,168 | 1,372 |
SVB | Investor dependent - growth stage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 2,627 | 2,897 |
SVB | Investor dependent - growth stage | Total Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 11 | 14 |
SVB | Investor dependent - growth stage | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 0 | 5 |
SVB | Investor dependent - growth stage | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 6 | 2 |
SVB | Investor dependent - growth stage | 90 Days or Greater |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 5 | 7 |
SVB | Investor dependent - growth stage | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 2,616 | 2,883 |
SVB | Innovation C&I and cash flow dependent |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 9,247 | 9,658 |
SVB | Innovation C&I and cash flow dependent | Total Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 54 | 70 |
SVB | Innovation C&I and cash flow dependent | 30-59 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 0 | 27 |
SVB | Innovation C&I and cash flow dependent | 60-89 Days Past Due |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 41 | 3 |
SVB | Innovation C&I and cash flow dependent | 90 Days or Greater |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | 13 | 40 |
SVB | Innovation C&I and cash flow dependent | Current |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Total loans and leases | $ 9,193 | $ 9,588 |

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 Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 20 -Name Accounting Standards Codification -Section 40 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481628/310-20-40-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 + Details
Name: | us-gaap_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetNotPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcnca_OwnerOccupiedCommercialMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcnca_NonOwnerOccupiedCommercialMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcnca_CommercialAndIndustrialLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcnca_FinancingReceivableLeasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcnca_RevolvingMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_AutomobileLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcnca_ConsumerLoanOtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=fcnca_SiliconValleyBridgeBankPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcnca_GlobalFundBankingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcnca_InvestorDependentEarlyStageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcnca_InvestorDependentGrowthStageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=fcnca_InnovationCreativityAndInnovationAndCashFlowDependentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |