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Regulatory Capital (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital conservation buffer 2.50%  
CET1 capital    
CET1 capital, actual $ 5,199,950 $ 5,206,521
CET1 capital, For capital adequacy purposes 2,158,439 2,291,552
Tier 1 risk-based capital    
Tier I risk-based capital, actual 5,737,095 5,743,666
Tier I risk-based capital, for capital adequacy purposes 2,877,919 3,055,403
Total risk-based capital    
Total risk-based capital, actual 6,622,462 6,654,224
Total risk-based capital, for capital adequacy purposes $ 3,837,226 $ 4,073,871
CET1 capital ratio    
CET1 capital ratio, actual 10.84% 10.22%
CET1 capital ratio, for capital adequacy purposes 4.50% 4.50%
Tier 1 risk-based capital ratio    
Tier I risk-based capital ratio, actual 0.1196 0.1128
Tier I risk-based capital ratio, for capital adequacy purposes 0.0600 0.0600
Total risk-based capital ratio    
Total risk-based capital ratio, actual 0.1381 0.1307
Total risk-based capital ratio, for capital adequacy purposes 0.0800 0.0800
Leverage ratio    
Leverage ratio, actual 0.0955 0.0949
Leverage ratio, for capital adequacy purposes 0.0400 0.0400
Synovus Bank    
CET1 capital    
CET1 capital, actual $ 5,657,947 $ 5,559,624
CET1 capital, For capital adequacy purposes 2,155,437 2,288,092
CET1 capital, to be well capitalized under prompt corrective action provisions 3,113,409 3,305,022
Tier 1 risk-based capital    
Tier I risk-based capital, actual 5,657,947 5,559,624
Tier I risk-based capital, for capital adequacy purposes 2,873,916 3,050,789
Tier I risk-based capital, to be well capitalized under prompt corrective action provisions 3,831,887 4,067,719
Total risk-based capital    
Total risk-based capital, actual 6,373,618 6,249,947
Total risk-based capital, for capital adequacy purposes 3,831,887 4,067,719
Total risk-based capital, to be well capitalized under prompt corrective action provisions $ 4,789,859 $ 5,084,649
CET1 capital ratio    
CET1 capital ratio, actual 11.81% 10.93%
CET1 capital ratio, for capital adequacy purposes 4.50% 4.50%
CET1 capital ratio, to be well capitalized under prompt corrective action provisions 6.50% 6.50%
Tier 1 risk-based capital ratio    
Tier I risk-based capital ratio, actual 0.1181 0.1093
Tier I risk-based capital ratio, for capital adequacy purposes 0.0600 0.0600
Tier I risk-based capital ratio, to be well capitalized under prompt corrective action provisions 0.0800 0.0800
Total risk-based capital ratio    
Total risk-based capital ratio, actual 0.1331 0.1229
Total risk-based capital ratio, for capital adequacy purposes 0.0800 0.0800
Total risk-based capital ratio, to be well capitalized under prompt corrective action provisions 0.1000 0.1000
Leverage ratio    
Leverage ratio, actual 0.0944 0.0921
Leverage ratio, for capital adequacy purposes 0.0400 0.0400
Leverage ratio, to be well capitalized under prompt corrective action provisions 0.0500 0.0500