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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Statement of Comprehensive Income [Abstract]      
Net income before-tax amount $ 1,018,680 $ 604,953 $ 696,162
Net income, tax (228,488) (125,502) (154,021)
Net income 790,192 479,451 542,141
Before-tax Amount      
Net unamortized unrealized holding losses on available for sale investment securities transferred to held to maturity 0 (708,549) 0
Reclassification adjustment for amortization of unrealized holding losses on held to maturity investment securities 72,659 58,808 0
Net change 72,659 (649,741) 0
Income Tax      
Net unamortized unrealized holding losses on available for sale investment securities transferred to held to maturity 0 171,115 0
Reclassification adjustment for amortization of unrealized holding losses on held to maturity investment securities (17,547) (14,202) 0
Net change (17,547) 156,913 0
Net of Tax Amount      
Net unamortized unrealized holding losses on available for sale investment securities transferred to held to maturity 0 (537,434) 0
Reclassification adjustment for amortization of unrealized holding losses on held to maturity investment securities 55,112 44,606 0
Net change 55,112 (492,828) 0
Before-tax Amount      
Net unrealized gains (losses) arising during the period 278,135 517,032 215,914
Reclassification adjustment for realized (gains) losses included in net income (704) 256,660 76,718
Net change 277,431 773,692 292,632
Income Tax      
Net unrealized gains (losses) arising during the period (67,170) (124,863) (52,101)
Reclassification adjustment for realized (gains) losses included in net income 170 (61,983) (18,527)
Net change (67,000) (186,846) (70,628)
Net of Tax Amount      
Net unrealized gains (losses) arising during the period 210,965 392,169 163,813
Reclassification adjustment for realized (gains) losses included in net income (534) 194,677 58,191
Net change 210,431 586,846 222,004
Before-tax Amount      
Net unrealized gains (losses) arising during the period 43,600 (70,101) (40,606)
Reclassification adjustment for realized (gains) losses included in net income 57,864 139,041 176,442
Net change 101,464 68,940 135,836
Income Tax      
Net unrealized gains (losses) arising during the period (10,529) 16,928 9,815
Reclassification adjustment for realized (gains) losses included in net income (13,974) (33,578) (42,611)
Net change (24,503) (16,650) (32,796)
Net of Tax Amount      
Net unrealized gains (losses) arising during the period 33,071 (53,173) (30,791)
Reclassification adjustment for realized (gains) losses included in net income 43,890 105,463 133,831
Net change 76,961 52,290 103,040
Total other comprehensive income 451,554 192,891 428,468
Total other comprehensive income (109,050) (46,583) (103,424)
Total other comprehensive income 342,504 146,308 325,044
Comprehensive income 1,132,696 625,759 867,185
Less: comprehensive income (loss) attributable to noncontrolling interest (1,788) (3,009) (1,564)
Comprehensive income attributable to Synovus Financial Corp. $ 1,134,484 $ 628,768 $ 868,749