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Other Noninterest Income and Other Noninterest Expense (Details) (USD $) | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Other Operating Cost and Expense [Line Items] |  |  |
Other Noninterest Expense | $ 207,842,000us-gaap_OtherNoninterestExpense | $ 193,014,000us-gaap_OtherNoninterestExpense | $ 179,315,000us-gaap_OtherNoninterestExpense
Loans Acquired With Deteriorated Credit Quality [Member] |  |  |
Other Operating Cost and Expense [Line Items] |  |  |
Proceeds from Recoveries of Loans Previously Charged off | 16,200,000us-gaap_ProceedsFromRecoveriesOfLoanPreviouslyChargedOff / fcnca_LoanDesignationAxis = fcnca_LoansAcquiredWithDeterioratedCreditQualityMember | 29,700,000us-gaap_ProceedsFromRecoveriesOfLoanPreviouslyChargedOff / fcnca_LoanDesignationAxis = fcnca_LoansAcquiredWithDeterioratedCreditQualityMember | 10,500,000us-gaap_ProceedsFromRecoveriesOfLoanPreviouslyChargedOff / fcnca_LoanDesignationAxis = fcnca_LoansAcquiredWithDeterioratedCreditQualityMember
Telecommunication |  |  |
Other Operating Cost and Expense [Line Items] |  |  |
Other Noninterest Expense | 10,834,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_TelecommunicationMember | 10,033,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_TelecommunicationMember | 11,131,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_TelecommunicationMember
Cardholder Reward Programs |  |  |
Other Operating Cost and Expense [Line Items] |  |  |
Other Noninterest Expense | 11,435,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_CardholderRewardProgramsMember | 10,154,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_CardholderRewardProgramsMember | 4,325,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_CardholderRewardProgramsMember
Processing Fees Paid To Third Parties |  |  |
Other Operating Cost and Expense [Line Items] |  |  |
Other Noninterest Expense | 17,089,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_ProcessingFeesPaidToThirdPartiesMember | 15,095,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_ProcessingFeesPaidToThirdPartiesMember | 14,454,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_ProcessingFeesPaidToThirdPartiesMember
Cardholder Processing |  |  |
Other Operating Cost and Expense [Line Items] |  |  |
Other Noninterest Expense | 11,950,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_CardholderProcessingMember | 9,892,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_CardholderProcessingMember | 11,816,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_CardholderProcessingMember
Merchant Processing |  |  |
Other Operating Cost and Expense [Line Items] |  |  |
Other Noninterest Expense | 39,874,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_MerchantProcessingMember | 35,279,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_MerchantProcessingMember | 33,313,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_MerchantProcessingMember
Collection |  |  |
Other Operating Cost and Expense [Line Items] |  |  |
Other Noninterest Expense | 11,595,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_CollectionMember | 21,209,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_CollectionMember | 25,591,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_CollectionMember
Consultant |  |  |
Other Operating Cost and Expense [Line Items] |  |  |
Other Noninterest Expense | 10,168,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_ConsultantMember | 9,740,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_ConsultantMember | 3,914,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = fcnca_ConsultantMember
Advertising |  |  |
Other Operating Cost and Expense [Line Items] |  |  |
Other Noninterest Expense | 11,461,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = sic_Z7310 | 8,286,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = sic_Z7310 | 3,897,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = sic_Z7310
Other Expense |  |  |
Other Operating Cost and Expense [Line Items] |  |  |
Other Noninterest Expense | $ 83,436,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = us-gaap_OtherExpenseMember | $ 73,326,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = us-gaap_OtherExpenseMember | $ 70,874,000us-gaap_OtherNoninterestExpense / us-gaap_NatureOfExpenseAxis = us-gaap_OtherExpenseMember

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- Definition Other noninterest expenses that are not separately presented in any other noninterest expense category. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition The cash inflow from loans reinstated and recovered that were previously deemed uncollectible. + References No definition available. + Details
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