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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]      
Net income, income tax $ (228,893) $ (110,970) $ (201,235)
Net income 760,467 373,695 563,780
Reclassification adjustment for net losses (gains) realized in net income on investment securities available for sale, before-tax amount 799 (78,931) 7,659
Reclassification adjustment for net losses (gains) realized in net income on investment securities available for sale, income tax (202) 20,443 (1,984)
Reclassification adjustment for realized (gains) losses included in net income 597 (58,488) 5,675
Other comprehensive income (loss), before-tax amount (324,561) 125,505 216,010
Other comprehensive income (loss), income tax 83,605 (32,511) (55,949)
Net current period other comprehensive income (loss) (240,956) 92,994 160,061
Comprehensive income 519,511 466,689 723,841
Parent Company      
Condensed Financial Statements, Captions [Line Items]      
Net income, before-tax amount 989,360 484,665 765,015
Net income, income tax (228,893) (110,970) (201,235)
Net income 760,467 373,695 563,780
Reclassification adjustment for net losses (gains) realized in net income on investment securities available for sale, before-tax amount 0 0 (22)
Reclassification adjustment for net losses (gains) realized in net income on investment securities available for sale, income tax 0 0 6
Reclassification adjustment for realized (gains) losses included in net income 0 0 (16)
Other comprehensive (loss) gain of bank subsidiary, before-tax amount (324,561) 125,505 216,032
Other comprehensive (loss) gain of bank subsidiary, income tax 83,605 (32,511) (55,955)
Other comprehensive (loss) gain of bank subsidiary, net of tax amount (240,956) 92,994 160,077
Other comprehensive income (loss), before-tax amount (324,561) 125,505 216,010
Other comprehensive income (loss), income tax 83,605 (32,511) (55,949)
Net current period other comprehensive income (loss) (240,956) 92,994 160,061
Comprehensive income $ 519,511 $ 466,689 $ 723,841