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Share-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 3.5 $ 3.0 $ 6.8 $ 6.3
Stock Options [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Other equity compensation, shares granted     0 0
Options outstanding 1,500,000   1,500,000  
Weighted-average exercise price, options $ 34.10   $ 34.10  
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     342,000  
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Other equity compensation, shares granted     84,000  
Market Restricted Stock Units (MRSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years)     3 years  
Weighted-average exercise price, shares granted during period     $ 26.22  
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 1,100,000   1,100,000  
Weighted-average exercise price, non-vested shares outstanding $ 26.30   $ 26.30  
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%   0.00%  
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%   75.00%  
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%   150.00%  
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%   125.00%  
2013 Omnibus Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Equivalents authorized 6,200,000   6,200,000  
Shares of authorized but unissued common stock reserved for future grants 8,600,000   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 1   1  
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