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Acquisitions (Narrative) (Details)
$ / shares in Units, $ in Thousands, shares in Millions
 12 Months Ended
Jan. 01, 2019
USD ($)
$ / shares
shares
Dec. 31, 2020
$ / shares
Dec. 31, 2019
$ / shares
Dec. 31, 2018
$ / shares
Business Acquisition [Line Items]        
Assumed in acquisition (in dollars per share) | $ / shares   $ 0 $ 23.22 $ 0
Stock price (Synovus' closing stock price on December 31, 2018) (in dollars per share) | $ / shares       $ 31.99
FCB Financial Holdings, Inc.        
Business Acquisition [Line Items]        
Consideration transferred $ 1,630,000      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Loans 9,290,000      
Deposits 10,930,000      
Cash paid 173      
Synovus common stock issued and reissued from treasury $ 1,580,000      
Stock issued in acquisitions (in shares) | shares 49.5      
Assumed in acquisition (in dollars per share) | $ / shares $ 44,000,000.0      
FCB Financial Holdings, Inc. | FCB Financial Holdings, Inc.        
Business Acquisition [Line Items]        
Merger exchange ratio 1.055