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Share-based Compensation (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 4,400 $ 3,500 $ 8,300 $ 6,800
Accelerated compensation cost $ 30   $ 200  
Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Other equity compensation, shares granted (in shares)     0  
Options outstanding (in options) 655,000   655,000  
Weighted-average exercise price, options (in dollars per share) $ 16.92   $ 16.92  
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years)     3 years  
Other equity compensation, shares granted (in shares)     234,000  
Weighted-average exercise price, shares granted during period (in dollars per share)     $ 47.67  
Performance Shares        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Other equity compensation, shares granted (in shares)     87,000  
Weighted-average exercise price, shares granted during period (in dollars per share)     $ 47.67  
Market Restricted Stock Units (MRSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years)     3 years  
Other equity compensation, shares granted (in shares)     58,000  
Weighted-average exercise price, shares granted during period (in dollars per share)     $ 47.67  
Non-Vested Synovus Shares And Restricted Share Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Other equity compensation, non-vested shares outstanding (in shares) 910,000   910,000  
Weighted-average exercise price, non-vested shares outstanding (in dollars per share) $ 40.82   $ 40.82  
Minimum | Market Restricted Stock Units (MRSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range based on shareholder return 75.00%   75.00%  
Minimum | Performance Share Units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range based on return on average assets (ROAA) 0.00%   0.00%  
Maximum | Market Restricted Stock Units (MRSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range based on shareholder return 125.00%   125.00%  
Maximum | Performance Share Units (PSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Range based on return on average assets (ROAA) 150.00%   150.00%  
2013 Omnibus Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares of authorized but unissued common stock reserved for future grants (in shares) 8,600,000   8,600,000  
Equivalents authorized (in shares) 4,900,000   4,900,000  
Contractual term (years)     10 years  
Minimum age of plan participants     65 years  
Plan participants, minimum period of service     10 years  
2013 Omnibus Plan | Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share equivalents ratio (in shares) 1   1  
2013 Omnibus Plan | Value Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share equivalents ratio (in shares) 2   2  
2013 Omnibus Plan | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years)     3 years  
2013 Omnibus Plan | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years)     5 years