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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2023
Feb. 20, 2024
Jun. 30, 2023
Entity Information [Line Items]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Entity File Number 1-10312    
Entity Registrant Name SYNOVUS FINANCIAL CORP    
Entity Incorporation, State or Country Code GA    
Entity Tax Identification Number 58-1134883    
Entity Address, Address Line One 1111 Bay Avenue    
Entity Address, Address Line Two Suite 500,    
Entity Address, City or Town Columbus,    
Entity Address, State or Province GA    
Entity Address, Postal Zip Code 31901    
City Area Code 706    
Local Phone Number 641-6500    
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 [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 4,215,933,879
Entity Common Stock, Shares Outstanding   146,399,324  
Documents Incorporated by Reference
Incorporated DocumentsForm 10-K Reference Locations
Portions of the Proxy Statement for the Annual Meeting of Shareholders to be held April 24, 2024 (“Proxy Statement”)Part III
    
Entity Central Index Key 0000018349    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY    
Amendment Flag false    
Document Transition Report false    
Common Stock, $1.00 Par Value      
Entity Information [Line Items]      
Title of 12(b) Security Common Stock, $1.00 Par Value    
Trading Symbol SNV    
Security Exchange Name NYSE    
Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D      
Entity Information [Line Items]      
Title of 12(b) Security Fixed-to-Floating Rate Non-Cumulative Perpetual Preferred Stock, Series D    
Trading Symbol SNV - PrD    
Security Exchange Name NYSE    
Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E      
Entity Information [Line Items]      
Title of 12(b) Security Fixed-Rate Reset Non-Cumulative Perpetual Preferred Stock, Series E    
Trading Symbol SNV - PrE    
Security Exchange Name NYSE