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Employee Benefit Plans (Narrative) (Details) (USD $)
12 Months Ended 3 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2014
Dec. 31, 2007
Dec. 31, 2014
Defined Benefit Plan Disclosure [Line Items]          
Defined Contribution Plan, Cost Recognized $ 14,900,000us-gaap_DefinedContributionPlanCostRecognized $ 14,100,000us-gaap_DefinedContributionPlanCostRecognized      
BancShares Plan          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Accumulated Benefit Obligation 448,716,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
  536,956,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
  536,956,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
Return On Plan Assets Over Last 15 Years     7.16%fcnca_ReturnOnPlanAssetsOverLast15Years
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
  7.16%fcnca_ReturnOnPlanAssetsOverLast15Years
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
Employer contributions 0us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
  0us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
   
Assumed discount rate (percent) 4.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
4.75%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
4.90%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
   
Assumed rate of salary increases 4.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
4.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
4.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
   
Expected long-term rate of return on plan assets (percent) 7.25%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
7.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
7.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
   
Return On Plan Assets Over Last 10 Years     8.24%fcnca_ReturnOnPlanAssetsOverLast10Years
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
  8.24%fcnca_ReturnOnPlanAssetsOverLast10Years
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
Return Plan Assets Over Last 5 Years     10.48%fcnca_ReturnPlanAssetsOverLast5Years
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
  10.48%fcnca_ReturnPlanAssetsOverLast5Years
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
Percent of employer match     75.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
 
Percentage of employee compensation matched     6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
 
Additional contribution if employed at end of year       3.00%fcnca_DefinedContributionPlanEmployerMatchingContributionAdditionalPercentofEmployeesGrossPayIfEmployedatYearEnd
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancSharesPlanMember
 
Bancorporation Plan          
Defined Benefit Plan Disclosure [Line Items]          
Defined Benefit Plan, Accumulated Benefit Obligation     136,425,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancorporationPlanMember
  136,425,000us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancorporationPlanMember
Employer contributions     0us-gaap_DefinedBenefitPlanContributionsByEmployer
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancorporationPlanMember
   
Assumed discount rate (percent)     4.35%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancorporationPlanMember
   
Assumed rate of salary increases     4.00%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancorporationPlanMember
   
Expected long-term rate of return on plan assets (percent)     7.50%us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancorporationPlanMember
   
Percent of employer match         100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancorporationPlanMember
Percentage of employee compensation matched         6.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancorporationPlanMember
Employee profit sharing contribution percentage         3.00%fcnca_DefinedContributionPlanEmployerMatchingContributionProfitSharingPercentofEmployeesGrossPay
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancorporationPlanMember
Bancorporation Plan          
Defined Benefit Plan Disclosure [Line Items]          
Defined Contribution Plan, Cost Recognized     1,100,000us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedContributionPlanNameAxis
= fcnca_BancorporationPlanMember
   
BancShares Plan          
Defined Benefit Plan Disclosure [Line Items]          
Defined Contribution Plan, Cost Recognized     $ 16,400,000us-gaap_DefinedContributionPlanCostRecognized
/ us-gaap_DefinedContributionPlanNameAxis
= fcnca_BancSharesPlanMember
   
401(k) Matching Range 1 [Member] | Bancorporation Plan          
Defined Benefit Plan Disclosure [Line Items]          
Percent of employer match         100.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancorporationPlanMember
/ us-gaap_DefinedContributionPlanNameAxis
= fcnca_A401KMatchingRange1Member
Percentage of employee compensation matched         3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancorporationPlanMember
/ us-gaap_DefinedContributionPlanNameAxis
= fcnca_A401KMatchingRange1Member
401(k) Matching Range 2 [Member] | Bancorporation Plan          
Defined Benefit Plan Disclosure [Line Items]          
Percent of employer match         50.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancorporationPlanMember
/ us-gaap_DefinedContributionPlanNameAxis
= fcnca_A401KMatchingRange2Member
Percentage of employee compensation matched         3.00%us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
/ us-gaap_DefinedBenefitPlansDisclosuresDefinedBenefitPlansAxis
= fcnca_BancorporationPlanMember
/ us-gaap_DefinedContributionPlanNameAxis
= fcnca_A401KMatchingRange2Member