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Capital Ratios (Details) - USD ($) $ in Thousands | 6 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Jan. 01, 2019
Capital ratios |  |  |  |  |  |  |  |  |
Capital conversion buffer common equity Tier 1 of risk-weighted assets (as a percent) |  |  |  |  |  |  |  |  | 2.50%
Decrease in capital due to redemption of debt |  | $ 63,500 |  |  |  |  |  |  |
Additional allowance for credit losses for loans |  | 350,401 | $ 406,460 | $ 457,309 | $ 434,608 | $ 144,785 |  | $ 56,927 |
Deferred tax assets |  | 36,714 |  | 110,946 |  |  |  |  |
Additional reserve for unfunded commitments |  | 31,000 |  |  |  |  |  |  |
Retained earnings |  | 836,584 |  | 657,451 |  |  |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |  |  |  |  |  |  |
Actual, Capital Amount |  | $ 3,102,963 |  | $ 3,010,174 |  |  |  |  |
Actual, Ratio (as a percent) |  | 12.14% |  | 11.77% |  |  |  |  |
Minimum capital required, Capital Amount |  | $ 1,789,798 |  | $ 1,789,984 |  |  |  |  |
Minimum capital required, Ratio (as a percent) |  | 7.00% |  | 7.00% |  |  |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 1,661,955 |  | $ 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 |  | $ 3,102,963 |  | $ 3,010,174 |  |  |  |  |
Actual, Ratio (as a percent) |  | 12.14 |  | 11.77 |  |  |  |  |
Minimum capital required, Capital Amount |  | $ 2,173,326 |  | $ 2,173,552 |  |  |  |  |
Minimum capital required, Ratio (as a percent) |  | 8.50 |  | 8.50 |  |  |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 2,045,483 |  | $ 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 |  | $ 3,609,452 |  | $ 3,642,039 |  |  |  |  |
Actual, Ratio (as a percent) |  | 14.12 |  | 14.24 |  |  |  |  |
Minimum capital required, Capital Amount |  | $ 2,684,696 |  | $ 2,684,976 |  |  |  |  |
Minimum capital required, Ratio (as a percent) |  | 10.50 |  | 10.50 |  |  |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 2,556,854 |  | $ 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 |  | $ 3,102,963 |  | $ 3,010,174 |  |  |  |  |
Actual, Ratio (as a percent) |  | 8.13 |  | 8.27 |  |  |  |  |
Minimum capital required, Capital Amount |  | $ 1,526,815 |  | $ 1,455,135 |  |  |  |  |
Minimum capital required, Ratio (as a percent) |  | 4.00 |  | 4.00 |  |  |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 1,908,518 |  | $ 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 |  |  |  |  |  |  |  |  |
Retained earnings |  |  |  |  |  |  | $ (44,800) |  |
Subordinated Debt |  |  |  |  |  |  |  |  |
Capital ratios |  |  |  |  |  |  |  |  |
Original Principal amount |  | $ 25,000 |  |  |  |  |  |  |
Trust Preferred Securities |  |  |  |  |  |  |  |  |
Capital ratios |  |  |  |  |  |  |  |  |
Original Principal amount |  | 38,500 |  |  |  |  |  |  |
South State Bank (the Bank) |  |  |  |  |  |  |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |  |  |  |  |  |  |
Actual, Capital Amount |  | $ 3,308,073 |  | $ 3,157,098 |  |  |  |  |
Actual, Ratio (as a percent) |  | 12.98% |  | 12.39% |  |  |  |  |
Minimum capital required, Capital Amount |  | $ 1,784,618 |  | $ 1,784,120 |  |  |  |  |
Minimum capital required, Ratio (as a percent) |  | 7.00% |  | 7.00% |  |  |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 1,657,145 |  | $ 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 |  | $ 3,308,073 |  | $ 3,157,098 |  |  |  |  |
Actual, Ratio (as a percent) |  | 12.98 |  | 12.39 |  |  |  |  |
Minimum capital required, Capital Amount |  | $ 2,167,036 |  | $ 2,166,432 |  |  |  |  |
Minimum capital required, Ratio (as a percent) |  | 8.50 |  | 8.50 |  |  |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 2,039,563 |  | $ 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 |  | $ 3,486,562 |  | $ 3,397,463 |  |  |  |  |
Actual, Ratio (as a percent) |  | 13.68 |  | 13.33 |  |  |  |  |
Minimum capital required, Capital Amount |  | $ 2,676,927 |  | $ 2,676,180 |  |  |  |  |
Minimum capital required, Ratio (as a percent) |  | 10.50 |  | 10.50 |  |  |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 2,549,454 |  | $ 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 |  | $ 3,308,073 |  | $ 3,157,098 |  |  |  |  |
Actual, Ratio (as a percent) |  | 8.69 |  | 8.71 |  |  |  |  |
Minimum capital required, Capital Amount |  | $ 1,522,405 |  | $ 1,450,600 |  |  |  |  |
Minimum capital required, Ratio (as a percent) |  | 4.00 |  | 4.00 |  |  |  |  |
Required to be considered well capitalized, Capital Amount |  | $ 1,903,006 |  | $ 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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