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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Statement of Comprehensive Income [Abstract]      
Net income before-tax amount $ 604,953 $ 696,162 $ 964,177
Net income, income tax (125,502) (154,021) (206,275)
Net income 479,451 542,141 757,902
Before-tax Amount      
Net unamortized unrealized holding (losses) gains on available for sale investment securities transferred to held to maturity (708,549) 0 0
Reclassification adjustment for the change in unamortized holding (losses) gains on held to maturity investment securities 58,808 0 0
Net change (649,741) 0 0
Income Tax      
Net unamortized unrealized holding (losses) gains on available for sale investment securities transferred to held to maturity 171,115 0 0
Reclassification adjustment for the change in unamortized holding (losses) gains on held to maturity investment securities (14,202) 0 0
Net change 156,913 0 0
Net of Tax Amount      
Net unamortized unrealized holding (losses) gains on available for sale investment securities transferred to held to maturity (537,434) 0 0
Reclassification adjustment for the change in unamortized holding (losses) gains on held to maturity investment securities 44,606 0 0
Net change (492,828) 0 0
Before-tax Amount      
Net unrealized gains (losses) arising during the period 517,032 215,914 (1,522,047)
Reclassification adjustment for realized (gains) losses included in net income 256,660 76,718 0
Net change 773,692 292,632 (1,522,047)
Income Tax      
Net unrealized gains (losses) arising during the period (124,863) (52,101) 369,764
Reclassification adjustment for realized (gains) losses included in net income (61,983) (18,527) 0
Net change (186,846) (70,628) 369,764
Net of Tax Amount      
Net unrealized gains (losses) arising during the period 392,169 163,813 (1,152,283)
Reclassification adjustment for realized (gains) losses included in net income 194,677 58,191 0
Net change 586,846 222,004 (1,152,283)
Before-tax Amount      
Net unrealized gains (losses) arising during the period (70,101) (40,606) (298,289)
Reclassification adjustment for realized (gains) losses included in net income 139,041 176,442 24,057
Net change 68,940 135,836 (274,232)
Income Tax      
Net unrealized gains (losses) arising during the period 16,928 9,815 72,574
Reclassification adjustment for realized (gains) losses included in net income (33,578) (42,611) (5,855)
Net change (16,650) (32,796) 66,719
Net of Tax Amount      
Net unrealized gains (losses) arising during the period (53,173) (30,791) (225,715)
Reclassification adjustment for realized (gains) losses included in net income 105,463 133,831 18,202
Net change 52,290 103,040 (207,513)
Total other comprehensive income (loss), before-tax amount 192,891 428,468 (1,796,279)
Other comprehensive income (loss), income tax (46,583) (103,424) 436,483
Other comprehensive income (loss) 146,308 325,044 (1,359,796)
Comprehensive income (loss) 625,759 867,185 (601,894)
Less: comprehensive income (loss) attributable to noncontrolling interest (3,009) (1,564) 0
Comprehensive income (loss) attributable to Synovus Financial Corp. $ 628,768 $ 868,749 $ (601,894)