XML 57 R46.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Loans and Leases (Aging Of The Outstanding Loans and Leases By Class) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
PCI loans | $ 703,837 | $ 762,998 | $ 848,816 | $ 809,169
Commercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
PCI loans | 355,928 | 393,419 |  |
Non-PCI loans | 14,871,562 | 14,799,054 |  |
Commercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
PCI loans | 9,316 | 10,135 |  |
Non-PCI loans | 738,413 | 669,215 |  |
Commercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
PCI loans | 325,073 | 358,103 |  |
Non-PCI loans | 9,859,136 | 9,729,022 |  |
Commercial | Other commercial real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
PCI loans | 16,179 | 17,124 |  |
Non-PCI loans | 386,734 | 473,433 |  |
Commercial | Commercial and industrial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
PCI loans | 3,732 | 6,374 |  |
Non-PCI loans | 2,695,205 | 2,730,407 |  |
Commercial | Lease financing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Non-PCI loans | 910,589 | 894,801 |  |
Commercial | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
PCI loans | 1,628 | 1,683 |  |
Non-PCI loans | 281,485 | 302,176 |  |
Noncommercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
PCI loans | 347,909 | 369,579 |  |
Noncommercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
PCI loans | 3,006 | 4,163 |  |
Noncommercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
PCI loans | 282,338 | 299,318 |  |
Noncommercial | Revolving mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
PCI loans | 60,388 | 63,908 |  |
Noncommercial | Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
PCI loans | 2,177 | 2,190 |  |
PCI Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
PCI loans | 703,837 | 762,998 |  |
PCI Loans | Noncommercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current loans | 307,843 | 318,632 |  |
PCI Loans | Noncommercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current loans | 2,420 | 3,521 |  |
PCI Loans | Noncommercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current loans | 249,443 | 257,166 |  |
PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current loans | 53,885 | 55,871 |  |
PCI Loans | Noncommercial | Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current loans | 2,095 | 2,074 |  |
Non-PCI Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 127,286 | 144,872 |  |
Current loans | 22,780,854 | 22,688,955 |  |
Non-PCI loans | 22,908,140 | 22,833,827 |  |
Non-PCI Loans | Commercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 3,139 | 1,290 |  |
Current loans | 735,274 | 667,925 |  |
Non-PCI loans | 738,413 | 669,215 |  |
Non-PCI Loans | Commercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 21,609 | 21,153 |  |
Current loans | 9,837,527 | 9,707,869 |  |
Non-PCI loans | 9,859,136 | 9,729,022 |  |
Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 189 | 182 |  |
Current loans | 386,545 | 473,251 |  |
Non-PCI loans | 386,734 | 473,433 |  |
Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 11,620 | 9,470 |  |
Current loans | 2,683,585 | 2,720,937 |  |
Non-PCI loans | 2,695,205 | 2,730,407 |  |
Non-PCI Loans | Commercial | Lease financing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 5,234 | 4,123 |  |
Current loans | 905,355 | 890,678 |  |
Non-PCI loans | 910,589 | 894,801 |  |
Non-PCI Loans | Commercial | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 222 | 327 |  |
Current loans | 281,263 | 301,849 |  |
Non-PCI loans | 281,485 | 302,176 |  |
Non-PCI Loans | Noncommercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Current loans | 7,951,305 | 7,926,446 |  |
Non-PCI loans | 8,036,578 | 8,034,773 |  |
Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 4,007 | 8,641 |  |
Current loans | 239,107 | 239,648 |  |
Non-PCI loans | 243,114 | 248,289 |  |
Non-PCI Loans | Noncommercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 45,464 | 57,851 |  |
Current loans | 3,542,327 | 3,465,935 |  |
Non-PCI loans | 3,587,791 | 3,523,786 |  |
Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 23,526 | 27,135 |  |
Current loans | 2,628,122 | 2,674,390 |  |
Non-PCI loans | 2,651,648 | 2,701,525 |  |
Non-PCI Loans | Noncommercial | Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 12,276 | 14,700 |  |
Current loans | 1,541,749 | 1,546,473 |  |
Non-PCI loans | 1,554,025 | 1,561,173 |  |
90 Days or greater | PCI Loans | Noncommercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 26,862 | 31,392 |  |
90 Days or greater | PCI Loans | Noncommercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 567 | 0 |  |
90 Days or greater | PCI Loans | Noncommercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 22,263 | 26,781 |  |
90 Days or greater | PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 3,990 | 4,569 |  |
90 Days or greater | PCI Loans | Noncommercial | Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 42 | 42 |  |
90 Days or greater | Non-PCI Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 44,383 | 45,791 |  |
90 Days or greater | Non-PCI Loans | Commercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 357 | 357 |  |
90 Days or greater | Non-PCI Loans | Commercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 7,058 | 6,490 |  |
90 Days or greater | Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 73 | 75 |  |
90 Days or greater | Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 1,503 | 1,266 |  |
90 Days or greater | Non-PCI Loans | Commercial | Lease financing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 1,512 | 973 |  |
90 Days or greater | Non-PCI Loans | Commercial | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 129 | 133 |  |
90 Days or greater | Non-PCI Loans | Noncommercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 33,751 | 36,497 |  |
90 Days or greater | Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 1,122 | 1,379 |  |
90 Days or greater | Non-PCI Loans | Noncommercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 19,202 | 21,901 |  |
90 Days or greater | Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 10,526 | 10,222 |  |
90 Days or greater | Non-PCI Loans | Noncommercial | Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 2,901 | 2,995 |  |
60 to 89 Days past due | PCI Loans | Noncommercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 2,287 | 6,212 |  |
60 to 89 Days past due | PCI Loans | Noncommercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 0 | 642 |  |
60 to 89 Days past due | PCI Loans | Noncommercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 1,436 | 4,846 |  |
60 to 89 Days past due | PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 851 | 701 |  |
60 to 89 Days past due | PCI Loans | Noncommercial | Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 0 | 23 |  |
60 to 89 Days past due | Non-PCI Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 15,972 | 19,050 |  |
60 to 89 Days past due | Non-PCI Loans | Commercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 771 | 442 |  |
60 to 89 Days past due | Non-PCI Loans | Commercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 4,738 | 2,375 |  |
60 to 89 Days past due | Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 22 | 0 |  |
60 to 89 Days past due | Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 1,844 | 1,510 |  |
60 to 89 Days past due | Non-PCI Loans | Commercial | Lease financing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 45 | 167 |  |
60 to 89 Days past due | Non-PCI Loans | Commercial | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 47 | 6 |  |
60 to 89 Days past due | Non-PCI Loans | Noncommercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 8,505 | 14,550 |  |
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 0 | 108 |  |
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 2,429 | 8,064 |  |
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 3,636 | 3,485 |  |
60 to 89 Days past due | Non-PCI Loans | Noncommercial | Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 2,440 | 2,893 |  |
30 to 59 Days past due | PCI Loans | Noncommercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 10,917 | 13,343 |  |
30 to 59 Days past due | PCI Loans | Noncommercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 19 | 0 |  |
30 to 59 Days past due | PCI Loans | Noncommercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 9,196 | 10,525 |  |
30 to 59 Days past due | PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 1,662 | 2,767 |  |
30 to 59 Days past due | PCI Loans | Noncommercial | Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 40 | 51 |  |
30 to 59 Days past due | Non-PCI Loans |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 66,931 | 80,031 |  |
30 to 59 Days past due | Non-PCI Loans | Commercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 2,011 | 491 |  |
30 to 59 Days past due | Non-PCI Loans | Commercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 9,813 | 12,288 |  |
30 to 59 Days past due | Non-PCI Loans | Commercial | Other commercial real estate |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 94 | 107 |  |
30 to 59 Days past due | Non-PCI Loans | Commercial | Commercial and industrial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 8,273 | 6,694 |  |
30 to 59 Days past due | Non-PCI Loans | Commercial | Lease financing |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 3,677 | 2,983 |  |
30 to 59 Days past due | Non-PCI Loans | Commercial | Other |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 46 | 188 |  |
30 to 59 Days past due | Non-PCI Loans | Noncommercial |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 43,017 | 57,280 |  |
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Construction and land development |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 2,885 | 7,154 |  |
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 23,833 | 27,886 |  |
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Revolving mortgage |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | 9,364 | 13,428 |  |
30 to 59 Days past due | Non-PCI Loans | Noncommercial | Consumer |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |
Past due loans | $ 6,935 | $ 8,812 |  |

X
- Definition All loans and leases, excluding purchased-credit impaired loans accounted for under ASC 310-30. + References No definition available. + Details
Name: | fcnca_Loansandleasesnotacquiredinatransferaccountedforasdebtsecurities
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and other-than-temporary impairments), for loans accounted for as debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
Name: | us-gaap_CertainLoansAcquiredInTransferAccountedForAsDebtSecuritiesCarryingAmountNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Recorded Investment in financing receivables that are past due at the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentPastDue
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_FinancingReceivableRecordedInvestmentPastDueLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_MortgageReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=fcnca_OtherRealEstateLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=fcnca_CommercialAndIndustrialMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_FinanceLeasesPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=fcnca_OtherLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_HomeEquityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=us-gaap_ConsumerLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fcnca_LoanDesignationAxis=us-gaap_ReceivablesAcquiredWithDeterioratedCreditQualityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | fcnca_LoanDesignationAxis=fcnca_NonPCILoansMember
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_FinancingReceivables60To89DaysPastDueMember
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: |