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Regulatory Capital (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Capital conservation buffer | 2.50% |
CET1 capital |  |
CET1 capital, Actual | $ 4,034,865 | $ 3,743,459
CET1 capital, For Capital Adequacy Purposes | 1,879,551 | 1,882,424
Tier 1 risk-based capital |  |
Tier I risk-based capital, Actual | 4,572,010 | 4,280,604
Tier I risk-based capital, For Capital Adequacy Purposes | 2,506,068 | 2,509,899
Total risk-based capital |  |
Total risk-based capital, Actual | 5,604,230 | 5,123,381
Total risk-based capital, For Capital Adequacy Purposes | $ 3,341,425 | $ 3,346,531
CET1 capital ratio |  |
CET1 capital ratio, Actual | 9.66% | 8.95%
CET1 capital ratio, For Capital Adequacy Purposes | 4.50% | 4.50%
Tier 1 risk-based capital ratio |  |
Tier I risk-based capital ratio, Actual | 0.1095 | 0.1023
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 | 0.1342 | 0.1225
Total risk-based capital ratio, For Capital Adequacy Purposes | 0.0800 | 0.0800
Leverage ratio |  |
Leverage ratio, Actual | 0.0850 | 0.0916
Leverage ratio, For Capital Adequacy Purposes | 0.0400 | 0.0400
Synovus Bank Reporting Unit |  |
CET1 capital |  |
CET1 capital, Actual | $ 4,641,711 | $ 4,640,501
CET1 capital, For Capital Adequacy Purposes | 1,880,757 | 1,881,199
CET1 capital, To Be Well Capitalized Under Prompt Corrective Action Provisions | 2,716,650 | 2,717,287
Tier 1 risk-based capital |  |
Tier I risk-based capital, Actual | 4,641,711 | 4,640,501
Tier I risk-based capital, For Capital Adequacy Purposes | 2,507,677 | 2,508,265
Tier I risk-based capital, To Be Well Capitalized Under Prompt Corrective Action Provisions | 3,343,569 | 3,344,354
Total risk-based capital |  |
Total risk-based capital, Actual | 5,361,611 | 4,923,279
Total risk-based capital, For Capital Adequacy Purposes | 3,343,569 | 3,344,354
Total risk-based capital, To Be Well Capitalized Under Prompt Corrective Action Provisions | $ 4,179,461 | $ 4,180,442
CET1 capital ratio |  |
CET1 capital ratio, Actual | 11.11% | 11.10%
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 | 0.1111 | 0.1110
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 | 0.1283 | 0.1178
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 | 0.0873 | 0.0994
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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