XML 23 R29.htm IDEA: XBRL DOCUMENT
v3.19.3

FDIC Shared-Loss Receivable (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2019
FDIC Shared-Loss Receivable [Abstract] |
Changes In Payable to FDIC | The following table provides changes in the FDIC shared-loss payable since December 31, 2018:
(Dollars in thousands) | Total
Balance at December 31, 2018 | $ | 105,618 |
Accretion | 4,968 |
Balance at September 30, 2019 | $ | 110,586 |

X
- Definition FDIC Shared-Loss Receivable [Abstract] + References No definition available. + Details
Name: | fcnca_FDICSharedLossReceivableAbstract
Namespace Prefix: | fcnca_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition [Table Text Block] for Schedule For FDIC Share-Loss Payable + References No definition available. + Details
Name: | fcnca_ScheduleForFDICShareLossPayableTableTextBlock
Namespace Prefix: | fcnca_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration