XML 86 R99.htm IDEA: XBRL DOCUMENT
v2.4.1.9

Shareholders' Equity, Dividends Restrictions and Other Regulatory Matters (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Tier 1 Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets | 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets |  |
Capital Required for Capital Adequacy to Risk Weighted Assets | 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets |  |
Leverage Capital Required Ratio To Tangible Assets | 3.00%fcnca_LeverageCapitalRequiredRatioToTangibleAssets |  |
Trust Preferred Securities | $ 128,500,000fcnca_TrustPreferredSecurities |  |
Percent Of Trust Preferred Securities Excluded From Tier One Starting In 2013 | 75.00%fcnca_PercentofTrustPreferredSecuritiesExcludedfromTierOneStartingIn2015 |  |
Remaining Percent of Trust Preferred Securities Excluded from Tier One After 2015 | 25.00%fcnca_RemainingPercentofTrustPreferredSecuritiesExcludedfromTierOneAfter2015 |  |
Tier 2 capital | 9,000,000us-gaap_TierTwoRiskBasedCapital | 25,000,000us-gaap_TierTwoRiskBasedCapital |
Amount Available for Dividend Distribution without Prior Approval from Regulatory Agency | 1,480,000,000us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval |  |
Maximum Undivided Profits Elgible For Dividend Payment Without Changing Well Capitalized Status | 672,400,000fcnca_MaximumUndividedProfitsElgibleForDividendPaymentWithoutChangingWellCapitalizedStatus |  |
Average Required Maintence Of Non Interst Bearing Reserve Balance | 382,700,000fcnca_AverageRequiredMaintenanceofNoninterestBearingReserveBalance |  |
Common Class A [Member] |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Votes per share of common stock | 1fcnca_Thenumberofvotesallowedforcommonstockdividends / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | 100,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |  |
Stock Repurchased During Period, Shares |  | 1,973us-gaap_StockRepurchasedDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember |
Class B Common Stock |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Votes per share of common stock | 16fcnca_Thenumberofvotesallowedforcommonstockdividends / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased | 25,000us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |
Stock Repurchased and Retired During Period, Shares | 45,900us-gaap_StockRepurchasedAndRetiredDuringPeriodShares / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember |  |
Parent |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Dividends from subsidiaries | 82,419,000us-gaap_DividendIncomeOperating / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 131,006,000us-gaap_DividendIncomeOperating / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | 179,588,000us-gaap_DividendIncomeOperating / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember
BancShares [Member] |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Tier 1 Capital for Capital Adequacy | 2,690,324,000us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = fcnca_BancSharesMember | 2,103,926,000us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = fcnca_BancSharesMember |
Capital Required for Capital Adequacy | 2,904,123,000us-gaap_Capital / dei_LegalEntityAxis = fcnca_BancSharesMember | 2,315,579,000us-gaap_Capital / dei_LegalEntityAxis = fcnca_BancSharesMember |
Leverage Capital Required for Capital Adequacy | 2,690,324,000us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = fcnca_BancSharesMember | 2,103,926,000us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = fcnca_BancSharesMember |
Tier 1 Risk Based Capital to Risk Weighted Assets | 13.61%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_BancSharesMember | 14.89%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_BancSharesMember |
Capital to Risk Weighted Assets | 14.69%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_BancSharesMember | 16.39%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_BancSharesMember |
Leverage Capital to Average Assets | 8.91%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = fcnca_BancSharesMember | 9.80%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = fcnca_BancSharesMember |
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_BancSharesMember | 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_BancSharesMember |
Capital Required to be Well Capitalized | 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_BancSharesMember | 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_BancSharesMember |
Leverage Capital Required to be Well Capitalized to Average Assets | 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = fcnca_BancSharesMember | 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = fcnca_BancSharesMember |
FCB-SC [Member] [Domain] |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Tier 1 Capital for Capital Adequacy | 653,515,000us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = fcnca_FCBSCMemberDomain | 734,218,000us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = fcnca_FCBSCMemberDomain |
Capital Required for Capital Adequacy | 657,475,000us-gaap_Capital / dei_LegalEntityAxis = fcnca_FCBSCMemberDomain | 787,962,000us-gaap_Capital / dei_LegalEntityAxis = fcnca_FCBSCMemberDomain |
Leverage Capital Required for Capital Adequacy | 653,515,000us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = fcnca_FCBSCMemberDomain | 734,218,000us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = fcnca_FCBSCMemberDomain |
Tier 1 Risk Based Capital to Risk Weighted Assets | 15.11%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_FCBSCMemberDomain | 17.09%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_FCBSCMemberDomain |
Capital to Risk Weighted Assets | 15.20%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_FCBSCMemberDomain | 18.34%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_FCBSCMemberDomain |
Leverage Capital to Average Assets | 7.89%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = fcnca_FCBSCMemberDomain | 9.12%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = fcnca_FCBSCMemberDomain |
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_FCBSCMemberDomain | 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_FCBSCMemberDomain |
Capital Required to be Well Capitalized | 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_FCBSCMemberDomain | 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_FCBSCMemberDomain |
Leverage Capital Required to be Well Capitalized to Average Assets | 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = fcnca_FCBSCMemberDomain | 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = fcnca_FCBSCMemberDomain |
FCB-SC [Member] [Domain] | Parent |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Dividends from subsidiaries | 52,397,000us-gaap_DividendIncomeOperating / dei_LegalEntityAxis = fcnca_FCBSCMemberDomain / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember |  |
FCB [Member] |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Tier 1 Capital for Capital Adequacy | 2,019,595,000us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = fcnca_FCBMember | 1,978,136,000us-gaap_TierOneRiskBasedCapital / dei_LegalEntityAxis = fcnca_FCBMember |
Capital Required for Capital Adequacy | 2,212,163,000us-gaap_Capital / dei_LegalEntityAxis = fcnca_FCBMember | 2,179,248,000us-gaap_Capital / dei_LegalEntityAxis = fcnca_FCBMember |
Leverage Capital Required for Capital Adequacy | 2,019,595,000us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = fcnca_FCBMember | 1,978,136,000us-gaap_TierOneLeverageCapital / dei_LegalEntityAxis = fcnca_FCBMember |
Tier 1 Risk Based Capital to Risk Weighted Assets | 13.12%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_FCBMember | 14.10%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_FCBMember |
Capital to Risk Weighted Assets | 14.37%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_FCBMember | 15.54%us-gaap_CapitalToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_FCBMember |
Leverage Capital to Average Assets | 9.30%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = fcnca_FCBMember | 9.34%us-gaap_TierOneLeverageCapitalToAverageAssets / dei_LegalEntityAxis = fcnca_FCBMember |
Tier 1 Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets | 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_FCBMember | 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_FCBMember |
Capital Required to be Well Capitalized | 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_FCBMember | 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets / dei_LegalEntityAxis = fcnca_FCBMember |
Leverage Capital Required to be Well Capitalized to Average Assets | 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = fcnca_FCBMember | 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets / dei_LegalEntityAxis = fcnca_FCBMember |
FCB [Member] | Parent |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |
Dividends from subsidiaries | $ 30,022,000us-gaap_DividendIncomeOperating / dei_LegalEntityAxis = fcnca_FCBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | $ 131,006,000us-gaap_DividendIncomeOperating / dei_LegalEntityAxis = fcnca_FCBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember | $ 179,588,000us-gaap_DividendIncomeOperating / dei_LegalEntityAxis = fcnca_FCBMember / us-gaap_StatementEquityComponentsAxis = us-gaap_ParentMember

X
- Definition Average Required Maintenance of Noninterest-Bearing Reserve Balance + References No definition available. + Details
Name: | fcnca_AverageRequiredMaintenanceofNoninterestBearingReserveBalance
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Leverage Capital Required Ratio To Tangible Assets + References No definition available. + Details
Name: | fcnca_LeverageCapitalRequiredRatioToTangibleAssets
Namespace Prefix: | fcnca_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Maximum Undivided Profits Elgible For Dividend Payment Without Changing Well Capitalized Status + References No definition available. + Details
Name: | fcnca_MaximumUndividedProfitsElgibleForDividendPaymentWithoutChangingWellCapitalizedStatus
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Percent of Trust Preferred Securities Excluded from Tier One Starting In 2015 + References No definition available. + Details
Name: | fcnca_PercentofTrustPreferredSecuritiesExcludedfromTierOneStartingIn2015
Namespace Prefix: | fcnca_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Remaining Percent of Trust Preferred Securities Excluded from Tier One After 2015 + References No definition available. + Details
Name: | fcnca_RemainingPercentofTrustPreferredSecuritiesExcludedfromTierOneAfter2015
Namespace Prefix: | fcnca_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The number of votes allowed for common stock dividends + References No definition available. + Details
Name: | fcnca_Thenumberofvotesallowedforcommonstockdividends
Namespace Prefix: | fcnca_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Trust Preferred Securities + References No definition available. + Details
Name: | fcnca_TrustPreferredSecurities
Namespace Prefix: | fcnca_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of total capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 + Details
Name: | us-gaap_Capital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
Name: | us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
Name: | us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Total Capital divided by risk weighted assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
Name: | us-gaap_CapitalToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_ComplianceWithRegulatoryCapitalRequirementsUnderBankingRegulationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of operating dividend income on securities. + 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 210.9-04.2) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 2 -Article 9 + Details
Name: | us-gaap_DividendIncomeOperating
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of dividends that can be declared or paid without approval of regulatory agency. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(e)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph e -Article 4 + Details
Name: | us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Number of shares that have been repurchased and retired during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
Name: | us-gaap_StockRepurchasedAndRetiredDuringPeriodShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Article 3 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 29, 30 -Article 5 + Details
Name: | us-gaap_StockRepurchasedDuringPeriodShares
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan. + References No definition available. + Details
Name: | us-gaap_StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased
Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneLeverageCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Tier 1 Leverage Capital divided by average assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneLeverageCapitalToAverageAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Tier 1 Risk Based Capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneRiskBasedCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958570-112826 + Details
Name: | us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Tier 1 capital divided by risk weighted assets as defined by regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=35709795&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=35709795&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Tier 2 risk-based capital as defined in the regulations. + References No definition available. + Details
Name: | us-gaap_TierTwoRiskBasedCapital
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | dei_LegalEntityAxis=fcnca_BancSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fcnca_FCBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=fcnca_FCBSCMemberDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementClassOfStockAxis=us-gaap_CommonClassBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementEquityComponentsAxis=us-gaap_ParentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |