Cover Page - shares	6 Months Ended
	Jun. 30, 2020	Aug. 04, 2020
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Jun. 30, 2020
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, 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 Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		147,312,937
Entity Central Index Key	0000018349
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Amendment Flag	false
Common Stock
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