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Employee Benefit Plans (Narrative) (Details) (USD $) | 12 Months Ended | 3 Months Ended
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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

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- Definition Defined Contribution Plan, Employer Matching Contribution, Additional Percent of Employees' Gross Pay If Employed at Year End + References No definition available. + Details
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- Definition Defined Contribution Plan, Employer Matching Contribution, Profit Sharing, Percent of Employees' Gross Pay + References No definition available. + Details
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- Definition Return On Plan Assets Over Last 10 Years + References No definition available. + Details
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- Definition Return On Plan Assets Over Last 15 Years + References No definition available. + Details
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- Definition Return Plan Assets Over Last 5 Years + References No definition available. + Details
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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Expected Long-Term Rate of Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512013 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Percentage employer matches of the employee's percentage contribution matched. + References No definition available. + Details
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