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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