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Regulatory Capital (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital conservation buffer 2.50%  
CET1 capital    
CET1 capital, actual $ 4,388,618 $ 4,034,865
CET1 capital, For capital adequacy purposes 2,079,435 1,879,551
Tier 1 risk-based capital    
Tier I risk-based capital, actual 4,925,763 4,572,010
Tier I risk-based capital, for capital adequacy purposes 2,772,581 2,506,068
Total risk-based capital    
Total risk-based capital, actual 5,827,196 5,604,230
Total risk-based capital, for capital adequacy purposes $ 3,696,774 $ 3,341,425
CET1 capital ratio    
CET1 capital ratio, actual 9.50% 9.66%
CET1 capital ratio, for capital adequacy purposes 4.50% 4.50%
Tier 1 risk-based capital ratio    
Tier I risk-based capital ratio, actual 0.1066 0.1095
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 0.1261 0.1342
Total risk-based capital ratio, for capital adequacy purposes 0.0800 0.0800
Leverage ratio    
Leverage ratio, actual 0.0872 0.0850
Leverage ratio, for capital adequacy purposes 0.0400 0.0400
Synovus Bank    
CET1 capital    
CET1 capital, actual $ 4,998,698 $ 4,641,711
CET1 capital, For capital adequacy purposes 2,076,515 1,880,757
CET1 capital, to be well capitalized under prompt corrective action provisions 2,999,410 2,716,650
Tier 1 risk-based capital    
Tier I risk-based capital, actual 4,998,698 4,641,711
Tier I risk-based capital, for capital adequacy purposes 2,768,686 2,507,677
Tier I risk-based capital, to be well capitalized under prompt corrective action provisions 3,691,581 3,343,569
Total risk-based capital    
Total risk-based capital, actual 5,587,757 5,361,611
Total risk-based capital, for capital adequacy purposes 3,691,581 3,343,569
Total risk-based capital, to be well capitalized under prompt corrective action provisions $ 4,614,477 $ 4,176,461
CET1 capital ratio    
CET1 capital ratio, actual 10.83% 11.11%
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 0.1083 0.1111
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 0.1211 0.1283
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 0.0886 0.0873
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