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v3.25.4

Long-term Debt - Schedule of Long-Term Debt (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2025 | Dec. 31, 2024
Debt Instrument [Line Items] |  |
Long-term debt | $ 2,456,442,000 | $ 1,733,109,000
Synovus Bank |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,739,387,000 | 686,159,000
5.625% Senior Bank Notes due February 15, 2028 | Senior Notes | Synovus Bank |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage (as a percent) | 5.625% |
Debt, face amount | $ 500,000,000.0 |
Long-term debt, gross | $ 493,466,000 | 490,283,000
4.00% Subordinated Notes, Due October 29, 2030 | Synovus Bank |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage (as a percent) | 4.00% |
Debt, face amount | $ 200,000,000.0 |
Interest rate period | 5 years |
Subordinated notes | $ 0 | 195,876,000
4.00% Subordinated Notes, Due October 29, 2030 | US Treasury Rate | Synovus Bank |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 3.625% |
5.957% Subordinated Notes, Due January 15, 2036 | Synovus Bank |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage (as a percent) | 5.957% |
Debt, face amount | $ 500,000,000.0 |
Interest rate period | 5 years |
Subordinated notes | $ 495,921,000 | 0
5.957% Subordinated Notes, Due January 15, 2036 | US Treasury Rate | Synovus Bank |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 2.30% |
Federal Home Loan Bank Advance | Synovus Bank |  |
Debt Instrument [Line Items] |  |
Weighted average interest rate (as a percent) | 3.88% |
Other long-term debt | $ 750,000,000 | 0
Parent Company |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 717,055,000 | 1,046,950,000
Parent Company | 6.168% Senior Notes, Due November 01, 2030 |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage (as a percent) | 6.168% |
Debt, face amount | $ 500,000,000.0 |
Interest rate period | 5 years |
Subordinated notes | $ 503,615,000 | 490,415,000
Parent Company | 6.168% Senior Notes, Due November 01, 2030 | Secured Overnight Financing Rate (SOFR) |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 2.347% |
Parent Company | 5.90% Subordinated Notes, due February 7, 2029 |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage (as a percent) | 5.90% |
Debt, face amount | $ 300,000,000.0 |
Interest rate period | 5 years |
Subordinated notes | $ 203,440,000 | 199,621,000
Parent Company | 5.90% Subordinated Notes, due February 7, 2029 | Five-Year Mid Swap Rate |  |
Debt Instrument [Line Items] |  |
Basis spread on variable rate (as a percent) | 3.379% |
Parent Company | 5.200% Senior Notes due August 11, 2025 | Senior Notes |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage (as a percent) | 5.20% |
Debt, face amount | $ 350,000,000.0 |
Long-term debt, gross | $ 0 | $ 346,914,000
Parent Company | SOFR Plus Spread of 2.06% Debentures, due June 15, 2035 |  |
Debt Instrument [Line Items] |  |
Interest rate, stated percentage (as a percent) | 2.06% |
Debt, face amount | $ 10,000,000.0 |
Interest rate at period end (as a percent) | 5.78% | 6.42%
Unsecured debt | $ 10,000,000 | $ 10,000,000

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