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Regulatory Capital (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Capital conservation buffer | 2.50% |
CET1 capital |  |
CET1 capital, actual | $ 5,206,521 | $ 4,926,194
CET1 capital, For capital adequacy purposes | 2,291,552 | 2,302,824
Tier 1 risk-based capital |  |
Tier I risk-based capital, actual | 5,743,666 | 5,463,339
Tier I risk-based capital, for capital adequacy purposes | 3,055,403 | 3,070,432
Total risk-based capital |  |
Total risk-based capital, actual | 6,654,224 | 6,415,681
Total risk-based capital, for capital adequacy purposes | $ 4,073,871 | $ 4,093,909
CET1 capital ratio |  |
CET1 capital ratio, actual | 10.22% | 9.63%
CET1 capital ratio, for capital adequacy purposes | 4.50% | 4.50%
Tier 1 risk-based capital ratio |  |
Tier I risk-based capital ratio, actual | 0.1128 | 0.1068
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 | 0.1307 | 0.1254
Total risk-based capital ratio, for capital adequacy purposes | 0.0800 | 0.0800
Leverage ratio |  |
Leverage ratio, actual | 0.0949 | 0.0907
Leverage ratio, for capital adequacy purposes | 0.0400 | 0.0400
Synovus Bank |  |
CET1 capital |  |
CET1 capital, actual | $ 5,559,624 | $ 5,446,703
CET1 capital, For capital adequacy purposes | 2,288,092 | 2,300,126
CET1 capital, to be well capitalized under prompt corrective action provisions | 3,305,022 | 3,322,404
Tier 1 risk-based capital |  |
Tier I risk-based capital, actual | 5,559,624 | 5,446,703
Tier I risk-based capital, for capital adequacy purposes | 3,050,789 | 3,066,835
Tier I risk-based capital, to be well capitalized under prompt corrective action provisions | 4,067,719 | 4,089,113
Total risk-based capital |  |
Total risk-based capital, actual | 6,249,947 | 6,079,152
Total risk-based capital, for capital adequacy purposes | 4,067,719 | 4,089,113
Total risk-based capital, to be well capitalized under prompt corrective action provisions | $ 5,084,649 | $ 5,111,391
CET1 capital ratio |  |
CET1 capital ratio, actual | 10.93% | 10.66%
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 | 0.1093 | 0.1066
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 | 0.1229 | 0.1189
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 | 0.0921 | 0.0906
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

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