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Long-term Debt and Short-term Borrowings (Schedule of Long-term Debt Instruments) (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Nov. 01, 2017
Dec. 31, 2016
Debt Instrument [Line Items]        
Long-term debt $ 1,657,157,000 $ 1,606,138,000    
Interest rate at period end 1.93% 0.65%   0.08%
3.125% Senior Notes due November 1, 2022        
Debt Instrument [Line Items]        
Stated percentage 3.125%   3.125%  
Debt, face amount $ 300,000,000   $ 300,000,000.0  
Synovus Bank Reporting Unit        
Debt Instrument [Line Items]        
Long-term debt 1,101,453,000 $ 1,051,549,000    
Synovus Bank Reporting Unit | FHLB Advances        
Debt Instrument [Line Items]        
FHLB advances with interest and principal payments due at various maturity dates through 2018 $ 1,100,000,000 $ 1,050,000,000    
Weighted average interest rate 2.53% 1.43%    
Synovus Bank Reporting Unit | FHLB Advances | Minimum        
Debt Instrument [Line Items]        
Stated percentage 2.49%      
Synovus Bank Reporting Unit | FHLB Advances | Maximum        
Debt Instrument [Line Items]        
Stated percentage 2.56%      
Synovus Bank Reporting Unit | Other Notes Payable and Capital Leases        
Debt Instrument [Line Items]        
Other notes payable and capital leases with interest and principal payments due at various maturity dates through 2031 $ 1,453,000 $ 1,549,000    
Weighted average interest rate 1.59%      
Parent Company        
Debt Instrument [Line Items]        
Long-term debt $ 555,704,000 554,589,000    
Parent Company | 5.75% Subordinated Notes, due December 15, 2025        
Debt Instrument [Line Items]        
Subordinated notes $ 248,101,000 247,618,000    
Stated percentage 5.75%      
Debt, face amount $ 250,000,000      
Parent Company | 5.75% Subordinated Notes, due December 15, 2025 | LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable rate 4.182%      
Parent Company | LIBOR 1.80% debentures, due April 19, 2035        
Debt Instrument [Line Items]        
Unsecured debt $ 10,000,000 $ 10,000,000    
Debt, face amount $ 10,000,000      
Interest rate at period end 4.59% 3.39%    
Parent Company | LIBOR 1.80% debentures, due April 19, 2035 | LIBOR        
Debt Instrument [Line Items]        
Basis spread on variable rate 1.80%      
Parent Company | Senior Notes | 3.125% Senior Notes due November 1, 2022        
Debt Instrument [Line Items]        
Long-term debt $ 297,603,000 $ 296,971,000