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Long-term Debt and Short Term Borrowings (Narrative) (Details) - USD ($) | Dec. 11, 2020 | Dec. 31, 2020 | Oct. 29, 2020 | Feb. 12, 2020 | Dec. 31, 2019 | Feb. 07, 2019
--- | --- | --- | --- | --- | --- | ---
FHLB Advances |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Loss on early extinguishment of debt | $ (9,200,000) |  |  |  |  |
FHBL obligations terminated | 1,130,000,000 |  |  |  |  |
FHLB Advances | Synovus Bank Reporting Unit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
FHBL obligations terminated |  | $ 0 |  |  | $ 1,300,000,000 |
Loans Receivable |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Recorded balance loans receivable |  |  |  |  | 6,190,000,000 |
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%
5.90% Subordinated Notes, due February 7, 2029 | After February 7, 2029 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated percentage |  |  |  |  |  | 3.379%
2.289% Fixed-to-Floating Rate Senior Bank Notes due 2023 | Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, face amount |  |  |  | $ 400,000,000.0 |  |
Stated percentage |  |  |  | 228.90% |  |
2.289% Fixed-to-Floating Rate Senior Bank Notes due 2023 | Senior Notes | Synovus Bank Reporting Unit |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt |  | $ 398,594,000 |  |  | $ 0 |
Four Percent Subordinated Debt, Due 2030 | Subordinated Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, face amount |  |  | $ 200.0 |  |  |
Stated percentage |  |  | 400.00% |  |  |
5.75% Subordinated Notes Due 2025 | Subordinated Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt, face amount | $ 250,000,000.0 |  |  |  |  |
Stated percentage | 5.75% |  |  |  |  |
Loss on early extinguishment of debt | $ (1,300,000) |  |  |  |  |

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