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FDIC Shared-Loss Payable (Changes in Receivable from FDIC) (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2018
FDIC Shared-Loss Receivable [Abstract] |  |  |
Loans and Leases Receivable, Gross, Carrying Amount, Covered |  |  | $ 55,600
FDIC shared-loss payable | $ 101,342 | $ 97,008 | $ 105,618
FDIC Indemnification Asset [Roll Forward] |  |  |
Beginning balance | 101,342 | 97,008 |
Accretion | 4,023 | 3,851 |
Adjustments related to changes in assumptions | 253 | 483 |
Ending balance | $ 105,618 | $ 101,342 |

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- Definition Amount of accretion expense for FDIC shared-loss payable. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition FDIC shared-loss payable adjustments related to changes in assumptions. + References No definition available. + Details
Name: | fcnca_FDICSharedLossPayableAdjustments
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
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- Definition FDIC Shared-Loss Receivable [Abstract] + References No definition available. + Details
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Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Payable to FDIC for Loss Share Agreements + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Aggregate gross carrying amount of loans and leases receivable covered by loss sharing agreements. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
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