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Long-term Debt and Short-term Borrowings (Schedule of Long-term Debt Instruments) (Details) - USD ($) | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 | Dec. 11, 2020 | Feb. 12, 2020 | Dec. 31, 2019 | Feb. 07, 2019 | Dec. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 1,202,494,000 |  |  | $ 2,153,897,000 |  |
Interest rate at period end | 0.11% |  |  | 1.60% |  | 1.93%
3.125% Senior Notes due November 1, 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, face amount | $ 300,000,000.0 |  |  |  |  |
Stated percentage | 3.125% |  |  |  |  |
5.90% Subordinated Notes, due February 7, 2029 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, face amount |  |  |  |  | $ 300,000,000.0 |
Stated percentage |  |  |  |  | 5.90% |
Senior Notes | 2.289% Fixed-to-Floating Rate Senior Bank Notes due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, face amount |  |  | $ 400,000,000.0 |  |  |
Stated percentage |  |  | 228.90% |  |  |
FHLB Advances |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
FHLB advances with interest and principal payments due at various maturity dates through 2018 |  | $ 1,130,000,000 |  |  |  |
Synovus Bank Reporting Unit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Other Long-term Debt | $ 145,000 |  |  | $ 0 |  |
Long-term debt | 596,088,000 |  |  | 1,300,000,000 |  |
Synovus Bank Reporting Unit | Four Percent Subordinated Notes, Due October 29, 2030 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subordinated notes | 197,349,000 |  |  | 0 |  |
Synovus Bank Reporting Unit | Senior Notes | 2.289% Fixed-to-Floating Rate Senior Bank Notes due 2023 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | 398,594,000 |  |  | 0 |  |
Synovus Bank Reporting Unit | FHLB Advances |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
FHLB advances with interest and principal payments due at various maturity dates through 2018 | $ 0 |  |  | $ 1,300,000,000 |  |
Weighted average interest rate | 1.76% |  |  | 2.53% |  |
Synovus Bank Reporting Unit | FHLB Advances | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated percentage | 1.66% |  |  |  |  |
Synovus Bank Reporting Unit | FHLB Advances | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated percentage | 1.97% |  |  |  |  |
Parent Company |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 606,406,000 |  |  | $ 853,897,000 |  |
Parent Company | 5.90% Subordinated Notes, due February 7, 2029 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subordinated notes | 297,553,000 |  |  | 297,250,000 |  |
Debt, face amount | $ 300,000,000 |  |  |  |  |
Stated percentage | 5.90% |  |  |  |  |
Parent Company | 5.90% Subordinated Notes, due February 7, 2029 | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 3.379% |  |  |  |  |
Parent Company | LIBOR 1.80% debentures, due April 19, 2035 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Unsecured debt | $ 10,000,000 |  |  | $ 10,000,000 |  |
Debt, face amount | $ 10,000,000 |  |  |  |  |
Interest rate at period end | 3.69% |  |  | 4.59% |  |
Parent Company | LIBOR 1.80% debentures, due April 19, 2035 | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 1.80% |  |  |  |  |
Parent Company | 5.75% Subordinated Notes, due December 15, 2025 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Subordinated notes | $ 0 |  |  | $ 248,419,000 |  |
Debt, face amount | $ 250,000,000 |  |  |  |  |
Stated percentage | 5.75% |  |  |  |  |
Parent Company | 5.75% Subordinated Notes, due December 15, 2025 | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate | 4.182% |  |  |  |  |
Parent Company | Senior Notes | 3.125% Senior Notes due November 1, 2022 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt | $ 298,853,000 |  |  | $ 298,228,000 |  |

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