XML 79 R53.htm IDEA: XBRL DOCUMENT
v3.19.3

Loans and Leases Loans and Leases (Recorded Fair Values of Purchased Non-Impaired Loans and Leases) (Details) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2019 USD ($)
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities Acquired During Period [Line Items] |
Reclassification of portfolio loans to (from) loans held for sale | $ (23.9)

X
- Definition Transfer of Portfolio Loans (From) To Loans Held-for-sale + References No definition available. + Details
Name: | fcnca_TransferofPortfolioLoansFromToLoansHeldforsale
Namespace Prefix: | fcnca_
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_CertainLoansAcquiredInTransferNotAccountedForAsDebtSecuritiesAcquiredDuringPeriodLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration