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Regulatory Capital (Tables) | 12 Months Ended
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Dec. 31, 2025
Regulatory Capital Disclosure [Abstract] |
Schedule of Regulatory Capital Information | The following table summarizes regulatory capital information at December 31, 2025 and 2024 for Synovus and Synovus Bank.
| Actual Capital |  | Minimum Requirement For Capital Adequacy |  | To Be Well-Capitalized Under Prompt Corrective Action Provisions(1)
(dollars in thousands) | 2025 |  | 2024 |  | 2025 |  | 2024 |  | 2025 |  | 2024
Synovus Financial Corp. |  |  |  |  |  |  |  |  |  |  |
CET1 capital | $ | 5,596,120 |  |  | $ | 5,199,950 |  |  | $ | 2,232,968 |  |  | $ | 2,158,439 |  |  | N/A |  | N/A
Tier 1 risk-based capital | 6,133,265 |  |  | 5,737,095 |  |  | 2,977,291 |  |  | 2,877,919 |  |  | N/A |  | N/A
Total risk-based capital | 7,282,394 |  |  | 6,622,462 |  |  | 3,969,721 |  |  | 3,837,226 |  |  | N/A |  | N/A
CET1 capital ratio | 11.28 | % |  | 10.84 | % |  | 4.50 | % |  | 4.50 | % |  | N/A |  | N/A
Tier 1 risk-based capital ratio | 12.36 |  |  | 11.96 |  |  | 6.00 |  |  | 6.00 |  |  | N/A |  | N/A
Total risk-based capital ratio | 14.68 |  |  | 13.81 |  |  | 8.00 |  |  | 8.00 |  |  | N/A |  | N/A
Leverage ratio | 10.12 |  |  | 9.55 |  |  | 4.00 |  |  | 4.00 |  |  | N/A |  | N/A
Synovus Bank |  |  |  |  |  |  |  |  |  |  |
CET1 capital | $ | 5,953,376 |  |  | $ | 5,657,947 |  |  | $ | 2,228,165 |  |  | $ | 2,155,437 |  |  | $ | 3,218,460 |  |  | $ | 3,113,409 |
Tier 1 risk-based capital | 5,953,376 |  |  | 5,657,947 |  |  | 2,970,886 |  |  | 2,873,916 |  |  | 3,961,182 |  |  | 3,831,887 |
Total risk-based capital | 6,970,441 |  |  | 6,373,618 |  |  | 3,961,182 |  |  | 3,831,887 |  |  | 4,951,477 |  |  | 4,789,859 |
CET1 capital ratio | 12.02 | % |  | 11.81 | % |  | 4.50 | % |  | 4.50 | % |  | 6.50 | % |  | 6.50 | %
Tier 1 risk-based capital ratio | 12.02 |  |  | 11.81 |  |  | 6.00 |  |  | 6.00 |  |  | 8.00 |  |  | 8.00 |
Total risk-based capital ratio | 14.08 |  |  | 13.31 |  |  | 8.00 |  |  | 8.00 |  |  | 10.00 |  |  | 10.00 |
Leverage ratio | 9.84 |  |  | 9.44 |  |  | 4.00 |  |  | 4.00 |  |  | 5.00 |  |  | 5.00 |
(1) The prompt corrective action provisions are applicable at the bank level only.

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- Definition Regulatory Capital Disclosure [Abstract] + References No definition available. + Details
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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B + Details
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