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Cover - USD ($)
 12 Months Ended
Dec. 31, 2025
Feb. 13, 2026
Jun. 30, 2025
Document Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Document Transition Report false    
Entity File Number 001-16715    
Entity Registrant Name FIRST CITIZENS BANCSHARES INC /DE/    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 56-1528994    
Entity Address, Address Line One 4300 Six Forks Road    
Entity Address, City or Town Raleigh    
Entity Address, State or Province NC    
Entity Address, Postal Zip Code 27609    
City Area Code (919)    
Local Phone Number 716-7000    
Title of 12(g) Security Class B Common Stock, Par Value $1    
Entity Well-known Seasoned Issuer Yes    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Large Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Document Financial Statement Error Correction false    
Entity Shell Company false    
Entity Public Float     $ 17,263,599,044
Documents Incorporated by Reference
Portions of the Registrant’s definitive Proxy Statement for the 2026 Annual Meeting of Stockholders are incorporated by reference into Part III of this report.
    
Entity Central Index Key 0000798941    
Document Period End Date --12-31    
Document Fiscal Year Focus 2025    
Document Fiscal Period Focus FY    
Amendment Flag false    
Class A Common Stock, Par Value $1      
Document Information [Line Items]      
Title of 12(b) Security Class A Common Stock, Par Value $1    
Trading Symbol FCNCA    
Security Exchange Name NASDAQ    
Entity Common Stock, Shares Outstanding   10,931,991  
Depositary Shares, Each Representing a 1/40th Interest in a Share of 5.375% Non-Cumulative Perpetual Preferred Stock, Series A      
Document Information [Line Items]      
Title of 12(b) Security Depositary Shares, Each Representing a 1/40th Interest in a Share of 5.375% Non-Cumulative Perpetual Preferred Stock, Series A    
Trading Symbol FCNCP    
Security Exchange Name NASDAQ    
5.625% Non-Cumulative Perpetual Preferred Stock, Series C      
Document Information [Line Items]      
Title of 12(b) Security 5.625% Non-Cumulative Perpetual Preferred Stock, Series C    
Trading Symbol FCNCO    
Security Exchange Name NASDAQ    
Depository Shares, Each Representing 1/40th Interest in a Share of 6.625% Non-Cumulative Perpetual Preferred Stock, Series E      
Document Information [Line Items]      
Title of 12(b) Security Depository Shares, Each Representing 1/40th Interest in a Share of 6.625% Non-Cumulative Perpetual Preferred Stock, Series E    
Trading Symbol FCNCN    
Security Exchange Name NASDAQ    
Class B      
Document Information [Line Items]      
Entity Common Stock, Shares Outstanding   1,005,185