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Basis of Presentation and Accounting Policies (Details)
Jul. 24, 2025
$ / shares
shares
Sep. 30, 2025
$ / shares
Dec. 31, 2024
$ / shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Common stock, par value (in dollars per share) | $ / shares $ 1.00 $ 1.00 $ 1.00
Fixed-Rate Non-Cumulative Perpetual Preferred Stock      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Preferred stock, dividend rate 6.75%    
Newco | Synovus Financial Corp      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Exchange ratio 0.5237    
Shares issues upon conversion (in shares) | shares 1    
Synovus Shareholders | Newco      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Ownership interest 48.50%    
Pinnacle Shareholders | Newco      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Ownership interest 51.50%