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Other Short-term Borrowings and Long-term Debt - Schedule of Long-term Debt Instruments (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Feb. 10, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | $ 4,109,597,000 | $ 1,204,229,000 |
Repayments of long-term debt, net |  | 700,000,000 | 0 | $ 2,408,939,000
Synovus Bank |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt |  | 3,465,107,000 | 596,895,000 |
2.289% Fixed-to-Floating Rate Senior Bank Notes due 2023 | Synovus Bank |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayments of long-term debt, net | $ 405,300,000 |  |  |
4.00% Subordinated Notes, Due October 29, 2030 | Synovus Bank |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Subordinated notes |  | $ 190,107,000 | 197,626,000 |
Stated percentage |  | 4.00% |  |
Debt, face amount |  | $ 200,000,000.0 |  |
Interest rate period |  | 5 years |  |
4.00% Subordinated Notes, Due October 29, 2030 | Synovus Bank | US Treasury Rate |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Basis spread on variable rate |  | 3.625% |  |
Federal Home Loan Bank Advance | Synovus Bank |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Other long-term debt |  | $ 3,275,000,000 | 0 |
Weighted average interest rate |  | 4.56% |  |
Senior Notes | 2.289% Fixed-to-Floating Rate Senior Bank Notes due 2023 | Synovus Bank |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 0 | 399,269,000 |
Stated percentage |  | 2.289% |  |
Debt, face amount |  | $ 400,000,000.0 |  |
Interest rate period |  | 2 years |  |
Senior Notes | 2.289% Fixed-to-Floating Rate Senior Bank Notes due 2023 | Synovus Bank | 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 |  | $ 644,490,000 | 607,334,000 |
Repayments of long-term debt, net |  | 300,000,000 | 0 | $ 250,000,000
Parent Company | 5.90% Subordinated Notes, due February 7, 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Subordinated notes |  | $ 298,158,000 | 297,855,000 |
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 |  | 6.57% | 2.00% |
Parent Company | Senior Notes | 3.125% Senior Notes due November 1, 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 0 | $ 299,479,000 |
Stated percentage |  | 3.125% |  |
Debt, face amount |  | $ 300,000,000.0 |  |
Parent Company | Senior Notes | 5.200% Senior Notes due August 11, 2025 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Long-term debt, gross |  | $ 336,332,000 | $ 0 |
Stated percentage |  | 5.20% |  |
Debt, face amount |  | $ 350,000,000.0 |  |

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