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Regulatory Capital (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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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

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