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Capital Ratios (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Jan. 01, 2019
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Capital ratios |  |  |  |  |  |  |
Capital conversion buffer common equity Tier 1 of risk-weighted assets (as a percent) |  |  |  |  |  |  | 2.50%
Additional allowance for credit losses for loans |  | $ 406,460 | $ 457,309 | $ 144,785 |  | $ 56,927 |
Deferred tax assets |  | 105,087 | 110,946 |  |  |  |
Additional reserve for unfunded commitments |  | 35,800 |  |  |  |  |
Retained earnings |  | 770,952 | 657,451 |  |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |  |  |  |  |
Actual, Capital Amount |  | $ 3,096,859 | $ 3,010,174 |  |  |  |
Actual, Ratio (as a percent) |  | 12.13% | 11.77% |  |  |  |
Minimum capital required, Capital Amount |  | $ 1,781,504 | $ 1,789,984 |  |  |  |
Minimum capital required, Ratio (as a percent) |  | 7.00% | 7.00% |  |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 1,654,253 | $ 1,662,128 |  |  |  |
Required to be considered well capitalized, Ratio (as a percent) |  | 6.50% | 6.50% |  |  |  |
Tier I capital to risk-weighted assets |  |  |  |  |  |  |
Actual, Capital Amount |  | $ 3,096,859 | $ 3,010,174 |  |  |  |
Actual, Ratio (as a percent) |  | 12.13 | 11.77 |  |  |  |
Minimum capital required, Capital Amount |  | $ 2,163,254 | $ 2,173,552 |  |  |  |
Minimum capital required, Ratio (as a percent) |  | 8.50 | 8.50 |  |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 2,036,004 | $ 2,045,696 |  |  |  |
Required to be considered well capitalized, Ratio (as a percent) |  | 8.00 | 8.00 |  |  |  |
Total capital to risk-weighted assets |  |  |  |  |  |  |
Actual, Capital Amount |  | $ 3,699,651 | $ 3,642,039 |  |  |  |
Actual, Ratio (as a percent) |  | 14.49 | 14.24 |  |  |  |
Minimum capital required, Capital Amount |  | $ 2,672,255 | $ 2,684,976 |  |  |  |
Minimum capital required, Ratio (as a percent) |  | 10.50 | 10.50 |  |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 2,545,005 | $ 2,557,120 |  |  |  |
Required to be considered well capitalized, Ratio (as a percent) |  | 10.00 | 10.00 |  |  |  |
Tier I capital to average assets (leverage ratio) |  |  |  |  |  |  |
Actual, Capital Amount |  | $ 3,096,859 | $ 3,010,174 |  |  |  |
Actual, Ratio (as a percent) |  | 8.47 | 8.27 |  |  |  |
Minimum capital required, Capital Amount |  | $ 1,463,005 | $ 1,455,135 |  |  |  |
Minimum capital required, Ratio (as a percent) |  | 4.00 | 4.00 |  |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 1,828,756 | $ 1,818,919 |  |  |  |
Required to be considered well capitalized, Ratio (as a percent) |  | 5.00 | 5.00 |  |  |  |
ASU 2016-13 |  |  |  |  |  |  |
Capital ratios |  |  |  |  |  |  |
Additional allowance for credit losses for loans | [1] |  |  |  | $ 54,438 |  |
Deferred tax assets | [2] |  |  |  | 12,639 |  |
Additional reserve for unfunded commitments |  |  |  |  | 6,400 |  |
Retained earnings | [3] |  |  |  | (44,820) |  |
ASU 2016-13 | Cumulative Effect of Adoption of ASU |  |  |  |  |  |  |
Capital ratios |  |  |  |  |  |  |
Additional allowance for credit losses for loans |  |  |  |  |  | $ 51,030 |
Retained earnings |  |  |  |  | $ (44,800) |  |
South State Bank (the Bank) |  |  |  |  |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |  |  |  |  |
Actual, Capital Amount |  | $ 3,275,890 | $ 3,157,098 |  |  |  |
Actual, Ratio (as a percent) |  | 12.87% | 12.39% |  |  |  |
Minimum capital required, Capital Amount |  | $ 1,776,040 | $ 1,784,120 |  |  |  |
Minimum capital required, Ratio (as a percent) |  | 7.00% | 7.00% |  |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 1,649,180 | $ 1,656,683 |  |  |  |
Required to be considered well capitalized, Ratio (as a percent) |  | 6.50% | 6.50% |  |  |  |
Tier I capital to risk-weighted assets |  |  |  |  |  |  |
Actual, Capital Amount |  | $ 3,275,890 | $ 3,157,098 |  |  |  |
Actual, Ratio (as a percent) |  | 12.87 | 12.39 |  |  |  |
Minimum capital required, Capital Amount |  | $ 2,156,620 | $ 2,166,432 |  |  |  |
Minimum capital required, Ratio (as a percent) |  | 8.50 | 8.50 |  |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 2,029,760 | $ 2,038,994 |  |  |  |
Required to be considered well capitalized, Ratio (as a percent) |  | 8.00 | 8.00 |  |  |  |
Total capital to risk-weighted assets |  |  |  |  |  |  |
Actual, Capital Amount |  | $ 3,487,182 | $ 3,397,463 |  |  |  |
Actual, Ratio (as a percent) |  | 13.70 | 13.33 |  |  |  |
Minimum capital required, Capital Amount |  | $ 2,664,060 | $ 2,676,180 |  |  |  |
Minimum capital required, Ratio (as a percent) |  | 10.50 | 10.50 |  |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 2,537,200 | $ 2,548,743 |  |  |  |
Required to be considered well capitalized, Ratio (as a percent) |  | 10.00 | 10.00 |  |  |  |
Tier I capital to average assets (leverage ratio) |  |  |  |  |  |  |
Actual, Capital Amount |  | $ 3,275,890 | $ 3,157,098 |  |  |  |
Actual, Ratio (as a percent) |  | 8.99 | 8.71 |  |  |  |
Minimum capital required, Capital Amount |  | $ 1,458,191 | $ 1,450,600 |  |  |  |
Minimum capital required, Ratio (as a percent) |  | 4.00 | 4.00 |  |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 1,822,739 | $ 1,813,250 |  |  |  |
Required to be considered well capitalized, Ratio (as a percent) |  | 5.00 | 5.00 |  |  |  |
Minimum |  |  |  |  |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |  |  |  |  |
Actual, Ratio (as a percent) |  | 4.50% |  |  |  |  |
Tier I capital to risk-weighted assets |  |  |  |  |  |  |
Actual, Ratio (as a percent) |  | 6 |  |  |  |  |
Total capital to risk-weighted assets |  |  |  |  |  |  |
Actual, Ratio (as a percent) |  | 4 |  |  |  |  |
Tier I capital to average assets (leverage ratio) |  |  |  |  |  |  |
Actual, Ratio (as a percent) |  | 8 |  |  |  |  |
[1] | This is the calculated adjustment to the ACL related to the adoption of ASC 326. Additional reserve related to non-acquired loans was $34,049, to acquired loans was $16,981 and to purchased credit deteriorated loans was $3,408.
[2] | This is the effect of deferred tax assets related to the adjustment to the ACL from the adoption of ASC 326 using a 22% tax rate.
[3] | This is the net adjustment to retained earnings related to the adoption of ASC 326.

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