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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 |  |  |

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