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Condensed Financial Information of Synovus Financial Corp. (Parent Company only) - Schedule of Condensed Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Condensed Financial Statements, Captions [Line Items]      
Net income $ 791,980 $ 482,460 $ 543,705
Total other comprehensive income 342,504 146,308 325,044
Comprehensive income attributable to Synovus Financial Corp. 1,134,484 628,768 868,749
Parent Company      
Condensed Financial Statements, Captions [Line Items]      
Net income 791,980 482,460 543,705
Other comprehensive gain (loss) of bank subsidiary 342,504 146,308 325,044
Total other comprehensive income 342,504 146,308 325,044
Comprehensive income attributable to Synovus Financial Corp. $ 1,134,484 $ 628,768 $ 868,749