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Long-term Debt and Short-term Borrowings - Schedule of Long-term Debt Instruments (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Feb. 10, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 1,204,229,000 | $ 1,202,494,000 |
Repayments of long-term debt, net |  | 0 | 2,408,939,000 | $ 157,226,000
Synovus Bank |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Other long-term debt |  | 0 | 145,000 |
Long-term debt |  | 596,895,000 | 596,088,000 |
Synovus Bank | 2.289% Fixed-to-Floating Rate Senior Bank Notes due 2023 | Subsequent Event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of long-term debt, net | $ 405,300,000 |  |  |
Stated percentage | 2.289% |  |  |
Debt, face amount | $ 400,000,000 |  |  |
Synovus Bank | Four Percent Subordinated Notes, Due October 29, 2030 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Subordinated notes |  | $ 197,626,000 | 197,349,000 |
Stated percentage |  | 4.00% |  |
Debt, face amount |  | $ 200,000,000.0 |  |
Interest rate period |  | 5 years |  |
Synovus Bank | Four Percent Subordinated Notes, Due October 29, 2030 | US Treasury Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 3.625% |  |
Synovus Bank | Senior Notes | 2.289% Fixed-to-Floating Rate Senior Bank Notes due 2023 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 399,269,000 | 398,594,000 |
Stated percentage |  | 2.289% |  |
Debt, face amount |  | $ 400,000,000.0 |  |
Interest rate period |  | 2 years |  |
Synovus Bank | Senior Notes | 2.289% Fixed-to-Floating Rate Senior Bank Notes due 2023 | Secured Overnight Financing Rate (SOFR) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 0.945% |  |
Parent Company |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 607,334,000 | 606,406,000 |
Repayments of long-term debt, net |  | 0 | 250,000,000 | $ 0
Parent Company | 5.90% Subordinated Notes, due February 7, 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Subordinated notes |  | $ 297,855,000 | 297,553,000 |
Stated percentage |  | 5.90% |  |
Debt, face amount |  | $ 300,000,000.0 |  |
Interest rate period |  | 5 years |  |
Parent Company | 5.90% Subordinated Notes, due February 7, 2029 | Five-Year Mid Swap Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 3.379% |  |
Parent Company | LIBOR 1.80% debentures, due June 15, 2035 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unsecured debt |  | $ 10,000,000 | $ 10,000,000 |
Stated percentage |  | 1.80% |  |
Debt, face amount |  | $ 10,000,000.0 |  |
Interest rate at period end |  | 2.00% | 2.02% |
Parent Company | Senior Notes | 3.125% Senior Notes due November 1, 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 299,479,000 | $ 298,853,000 |
Stated percentage |  | 3.125% |  |
Debt, face amount |  | $ 300,000,000.0 |  |

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