XML 48 R72.htm IDEA: XBRL DOCUMENT
v3.3.0.814

Transactions With Related Persons (Details) | 9 Months Ended
--- | ---
Sep. 30, 2015
Related Party Transactions [Abstract] |
Deposit Premium | 1.00%

X
- Definition Premium percentage for deposits bought in sale of branch. + References No definition available. + Details
Name: | fcnca_DepositPremium
Namespace Prefix: | fcnca_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_RelatedPartyTransactionsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration