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Condensed Financial Information of Synovus Financial Corp. (Parent Company only) - Condensed Statements of Comprehensive Income (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Condensed Financial Statements, Captions [Line Items]      
Net income (loss) $ 543,705 $ 757,902 $ 760,467
Other comprehensive income (loss) 325,044 (1,359,796) (240,956)
Comprehensive income (loss) attributable to Synovus Financial Corp. 868,749 (601,894) 519,511
Parent Company      
Condensed Financial Statements, Captions [Line Items]      
Net income (loss) 543,705 757,902 760,467
Other comprehensive gain (loss) of bank subsidiary 325,044 (1,359,796) (240,956)
Other comprehensive income (loss) 325,044 (1,359,796) (240,956)
Comprehensive income (loss) attributable to Synovus Financial Corp. $ 868,749 $ (601,894) $ 519,511