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Employee Benefit Plans (Present Value of Accrued Liability) (Details) (Executives Directors And Officer Of Acquired Entities [Member], USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Executives Directors And Officer Of Acquired Entities [Member] |  |
Present Value Of Accrued Liabilitiy [Roll Forward] |  |
Present value of accrued liability as of January 1 | $ 23,960fcnca_DefinedBenefitPlanPresentValueOfAccruedLiability / us-gaap_TitleOfIndividualAxis = fcnca_ExecutivesDirectorsAndOfficerOfAcquiredEntitiesMember | $ 25,851fcnca_DefinedBenefitPlanPresentValueOfAccruedLiability / us-gaap_TitleOfIndividualAxis = fcnca_ExecutivesDirectorsAndOfficerOfAcquiredEntitiesMember
Executive compensation liability acquired from 1st Financial | 1,455fcnca_ExecutiveCompensationLiabilityAcquiredFrom1stFinancial / us-gaap_TitleOfIndividualAxis = fcnca_ExecutivesDirectorsAndOfficerOfAcquiredEntitiesMember | 0fcnca_ExecutiveCompensationLiabilityAcquiredFrom1stFinancial / us-gaap_TitleOfIndividualAxis = fcnca_ExecutivesDirectorsAndOfficerOfAcquiredEntitiesMember
Executive compensation liability acquired from Bancorporation | 10,288fcnca_ExecutiveCompensationLiabilityAcquiredFromBancorporation / us-gaap_TitleOfIndividualAxis = fcnca_ExecutivesDirectorsAndOfficerOfAcquiredEntitiesMember | 0fcnca_ExecutiveCompensationLiabilityAcquiredFromBancorporation / us-gaap_TitleOfIndividualAxis = fcnca_ExecutivesDirectorsAndOfficerOfAcquiredEntitiesMember
Benefit expense | 2,682us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_TitleOfIndividualAxis = fcnca_ExecutivesDirectorsAndOfficerOfAcquiredEntitiesMember | 1,151us-gaap_DefinedBenefitPlanNetPeriodicBenefitCost / us-gaap_TitleOfIndividualAxis = fcnca_ExecutivesDirectorsAndOfficerOfAcquiredEntitiesMember
Benefits paid | (2,431)us-gaap_DefinedBenefitPlanBenefitsPaid / us-gaap_TitleOfIndividualAxis = fcnca_ExecutivesDirectorsAndOfficerOfAcquiredEntitiesMember | (3,042)us-gaap_DefinedBenefitPlanBenefitsPaid / us-gaap_TitleOfIndividualAxis = fcnca_ExecutivesDirectorsAndOfficerOfAcquiredEntitiesMember
Benefits forfeited | 0fcnca_DefinedBenefitPlanBenefitsForfeited / us-gaap_TitleOfIndividualAxis = fcnca_ExecutivesDirectorsAndOfficerOfAcquiredEntitiesMember | 0fcnca_DefinedBenefitPlanBenefitsForfeited / us-gaap_TitleOfIndividualAxis = fcnca_ExecutivesDirectorsAndOfficerOfAcquiredEntitiesMember
Present value of accrued liability as of December 31 | $ 35,954fcnca_DefinedBenefitPlanPresentValueOfAccruedLiability / us-gaap_TitleOfIndividualAxis = fcnca_ExecutivesDirectorsAndOfficerOfAcquiredEntitiesMember | $ 23,960fcnca_DefinedBenefitPlanPresentValueOfAccruedLiability / us-gaap_TitleOfIndividualAxis = fcnca_ExecutivesDirectorsAndOfficerOfAcquiredEntitiesMember

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- Definition Defined Benefit Plan, Benefits Forfeited + References No definition available. + Details
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- Definition Defined Benefit Plan, Present Value Of Accrued Liability + References No definition available. + Details
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- Definition Executive Compensation Liability Acquired From 1st Financial + References No definition available. + Details
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- Definition Executive Compensation Liability Acquired From Bancorporation + References No definition available. + Details
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- Details
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- Definition The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Postretirement Benefits -URI http://asc.fasb.org/extlink&oid=6521376 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=6506267 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Glossary Benefits -URI http://asc.fasb.org/extlink&oid=6506309 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + 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 (j) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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