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Regulatory Capital (Details) - USD ($) $ in Thousands | Dec. 31, 2025 | Dec. 31, 2024
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CET1 capital |  |
CET1 capital, actual capital | $ 5,596,120 | $ 5,199,950
CET1 capital, Minimum requirement for capital adequacy | 2,232,968 | 2,158,439
Tier 1 risk-based capital |  |
Tier I risk-based capital, actual capital | 6,133,265 | 5,737,095
Tier I risk-based capital, Minimum requirement for capital adequacy | 2,977,291 | 2,877,919
Total risk-based capital |  |
Total risk-based capital, actual capital | 7,282,394 | 6,622,462
Total risk-based capital, Minimum requirement for capital adequacy | $ 3,969,721 | $ 3,837,226
CET1 capital ratio |  |
CET1 capital ratio, actual capital | 11.28% | 10.84%
CET1 capital ratio, Minimum requirement for capital adequacy | 4.50% | 4.50%
Tier 1 risk-based capital ratio |  |
Tier I risk-based capital ratio, actual capital | 0.1236 | 0.1196
Tier I risk-based capital ratio, Minimum requirement for capital adequacy | 0.0600 | 0.0600
Total risk-based capital ratio |  |
Total risk-based capital ratio, actual capital | 0.1468 | 0.1381
Total risk-based capital ratio, Minimum requirement for capital adequacy | 0.0800 | 0.0800
Leverage ratio |  |
Leverage ratio, actual capital | 0.1012 | 0.0955
Leverage ratio, Minimum requirement for capital adequacy | 0.0400 | 0.0400
Capital conservation buffer | 2.50% |
Synovus Bank |  |
CET1 capital |  |
CET1 capital, actual capital | $ 5,953,376 | $ 5,657,947
CET1 capital, Minimum requirement for capital adequacy | 2,228,165 | 2,155,437
CET1 capital, to be well capitalized under prompt corrective action provisions | 3,218,460 | 3,113,409
Tier 1 risk-based capital |  |
Tier I risk-based capital, actual capital | 5,953,376 | 5,657,947
Tier I risk-based capital, Minimum requirement for capital adequacy | 2,970,886 | 2,873,916
Tier I risk-based capital, to be well capitalized under prompt corrective action provisions | 3,961,182 | 3,831,887
Total risk-based capital |  |
Total risk-based capital, actual capital | 6,970,441 | 6,373,618
Total risk-based capital, Minimum requirement for capital adequacy | 3,961,182 | 3,831,887
Total risk-based capital, to be well capitalized under prompt corrective action provisions | $ 4,951,477 | $ 4,789,859
CET1 capital ratio |  |
CET1 capital ratio, actual capital | 12.02% | 11.81%
CET1 capital ratio, Minimum requirement for capital adequacy | 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 capital | 0.1202 | 0.1181
Tier I risk-based capital ratio, Minimum requirement for capital adequacy | 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 capital | 0.1408 | 0.1331
Total risk-based capital ratio, Minimum requirement for capital adequacy | 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 capital | 0.0984 | 0.0944
Leverage ratio, Minimum requirement for capital adequacy | 0.0400 | 0.0400
Leverage ratio, to be well capitalized under prompt corrective action provisions | 0.0500 | 0.0500

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