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Regulatory Capital (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital conservation buffer 2.50%  
CET1 capital    
CET1 capital, actual $ 4,926,194 $ 4,388,618
CET1 capital, For capital adequacy purposes 2,302,824 2,079,435
Tier 1 risk-based capital    
Tier I risk-based capital, actual 5,463,339 4,925,763
Tier I risk-based capital, for capital adequacy purposes 3,070,432 2,772,581
Total risk-based capital    
Total risk-based capital, actual 6,415,681 5,827,196
Total risk-based capital, for capital adequacy purposes $ 4,093,909 $ 3,696,774
CET1 capital ratio    
CET1 capital ratio, actual 9.63% 9.50%
CET1 capital ratio, for capital adequacy purposes 4.50% 4.50%
Tier 1 risk-based capital ratio    
Tier I risk-based capital ratio, actual 0.1068 0.1066
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 0.1254 0.1261
Total risk-based capital ratio, for capital adequacy purposes 0.0800 0.0800
Leverage ratio    
Leverage ratio, actual 0.0907 0.0872
Leverage ratio, for capital adequacy purposes 0.0400 0.0400
Synovus Bank    
CET1 capital    
CET1 capital, actual $ 5,446,703 $ 4,998,698
CET1 capital, For capital adequacy purposes 2,300,126 2,076,515
CET1 capital, to be well capitalized under prompt corrective action provisions 3,322,404 2,999,410
Tier 1 risk-based capital    
Tier I risk-based capital, actual 5,446,703 4,998,698
Tier I risk-based capital, for capital adequacy purposes 3,066,835 2,768,686
Tier I risk-based capital, to be well capitalized under prompt corrective action provisions 4,089,113 3,691,581
Total risk-based capital    
Total risk-based capital, actual 6,079,152 5,587,757
Total risk-based capital, for capital adequacy purposes 4,089,113 3,691,581
Total risk-based capital, to be well capitalized under prompt corrective action provisions $ 5,111,391 $ 4,614,477
CET1 capital ratio    
CET1 capital ratio, actual 10.66% 10.83%
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 0.1066 0.1083
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 0.1189 0.1211
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 0.0906 0.0886
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