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Share-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share-based compensation expense $ 3.4 $ 3.3
Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Other equity compensation, shares granted (in shares) 0 0
Options outstanding (in options) 863,000  
Weighted-average exercise price, options (in dollars per share) $ 17.80  
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period (in years) 3 years  
Other equity compensation, shares granted (in shares) 207,000  
Performance Shares [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Other equity compensation, shares granted (in shares) 73,000  
Market Restricted Stock Units (MRSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period (in years) 3 years  
Other equity compensation, shares granted (in shares) 73,000  
Weighted-average exercise price, shares granted during period (in dollars per share) $ 41.93  
Non-Vested Synovus Shares And Restricted Share Units [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Other equity compensation, non-vested shares outstanding (in shares) 1,000,000  
Weighted-average exercise price, non-vested shares outstanding (in dollars per share) $ 32.36  
Minimum [Member] | Market Restricted Stock Units (MRSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range based on shareholder return 75.00%  
Minimum [Member] | Performance Share Units (PSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range based on return on average assets (ROAA) 0.00%  
Maximum [Member] | Market Restricted Stock Units (MRSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range based on shareholder return 125.00%  
Maximum [Member] | Performance Share Units (PSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Range based on return on average assets (ROAA) 150.00%  
2013 Omnibus Plan [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equivalents authorized (in shares) 5,700,000  
Shares of authorized but unissued common stock reserved for future grants (in shares) 8,600,000  
Contractual term (years) 10 years  
2013 Omnibus Plan [Member] | Stock Options [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share equivalents ratio (in shares) 1  
2013 Omnibus Plan [Member] | Value Awards [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Share equivalents ratio (in shares) 2  
2013 Omnibus Plan [Member] | Minimum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period (in years) 3 years  
2013 Omnibus Plan [Member] | Maximum [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting period (in years) 5 years