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Capital Ratios (Details) - USD ($) $ in Thousands | Jan. 01, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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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 |  |  | $ 144,785 | $ 56,927 | $ 56,522 |  | $ 55,798
Deferred tax assets |  |  | 46,365 | $ 31,316 | $ 31,884 |  |
Additional reserve for unfunded commitments |  |  | $ 8,600 |  |  |  |
Tier One Risk Based Capital to Risk Weighted Assets |  |  | 12.03% | 12.25% | 12.85% |  |
Capital to Risk Weighted Assets (as a percent) |  |  | 12.72% | 12.78% | 13.35% |  |
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets (as a percent) |  |  | 8.00% | 8.00% | 8.00% |  |
Common equity Tier 1 to risk-weighted assets |  |  |  |  |  |  |
Actual, Capital Amount |  |  | $ 1,325,607 | $ 1,326,725 | $ 1,338,085 |  |
Actual, Ratio (as a percent) |  |  | 11.09% | 11.30% | 11.86% |  |
Minimum capital required, Ratio (as a percent) |  |  | 4.50% |  |  |  |
Required to be considered well capitalized, Capital Amount |  |  | $ 777,190 | $ 763,495 | $ 733,481 |  |
Required to be considered well capitalized, Ratio (as a percent) |  |  | 6.50% | 6.50% | 6.50% |  |
Tier I capital to risk-weighted assets |  |  |  |  |  |  |
Actual, Capital Amount |  |  | $ 1,438,043 | $ 1,438,995 | $ 1,449,854 |  |
Actual, Ratio (as a percent) |  |  | 12.03% | 12.25% | 12.85% |  |
Minimum capital required, Ratio (as a percent) |  |  | 6.00% | 4.00% |  |  |
Required to be considered well capitalized, Capital Amount |  |  | $ 956,542 | $ 939,686 | $ 902,746 |  |
Required to be considered well capitalized, Ratio (as a percent) |  |  | 8.00% | 8.00% | 8.00% |  |
Total capital to risk-weighted assets |  |  |  |  |  |  |
Actual, Capital Amount |  |  | $ 1,520,966 | $ 1,501,321 | $ 1,506,710 |  |
Actual, Ratio (as a percent) |  |  | 12.72% | 12.78% | 13.35% |  |
Minimum capital required, Ratio (as a percent) |  |  | 8.00% |  |  |  |
Required to be considered well capitalized, Capital Amount |  |  | $ 1,195,677 | $ 1,174,607 | $ 1,128,433 |  |
Required to be considered well capitalized, Ratio (as a percent) |  |  | 10.00% | 10.00% | 10.00% |  |
Tier I capital to average assets (leverage ratio) |  |  |  |  |  |  |
Actual, Capital Amount |  |  | $ 1,438,043 | $ 1,438,995 | $ 1,449,854 |  |
Actual, Ratio (as a percent) |  |  | 9.56% | 9.73% | 10.52% |  |
Minimum capital required, Ratio (as a percent) |  |  | 4.00% |  |  |  |
Required to be considered well capitalized, Capital Amount |  |  | $ 752,114 | $ 739,664 | $ 689,207 |  |
Required to be considered well capitalized, Ratio (as a percent) |  |  | 5.00% | 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 |  |  |  |  |
Adjustment to retained earnings |  | $ 44,800 |  |  |  |  |
Phase-In Schedule | ASU 2016-13 |  |  |  |  |  |  |
Capital ratios |  |  |  |  |  |  |
Tier One Risk Based Capital to Risk Weighted Assets |  |  | 11.56% |  |  |  |
Capital to Risk Weighted Assets (as a percent) |  |  | 12.81% |  |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |  |  |  |  |
Actual, Ratio (as a percent) |  |  | 10.62% |  |  |  |
Tier I capital to risk-weighted assets |  |  |  |  |  |  |
Actual, Ratio (as a percent) |  |  | 11.56% |  |  |  |
Total capital to risk-weighted assets |  |  |  |  |  |  |
Actual, Ratio (as a percent) |  |  | 12.81% |  |  |  |
Tier I capital to average assets (leverage ratio) |  |  |  |  |  |  |
Actual, Ratio (as a percent) |  |  | 9.23% |  |  |  |
Fully Phased-In |  |  |  |  |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |  |  |  |  |
Minimum capital required, Capital Amount |  |  | $ 836,974 | $ 822,225 | $ 789,903 |  |
Minimum capital required, Ratio (as a percent) |  |  | 7.00% | 7.00% | 7.00% |  |
Tier I capital to risk-weighted assets |  |  |  |  |  |  |
Minimum capital required, Capital Amount |  |  | $ 1,016,325 | $ 998,416 | $ 959,168 |  |
Minimum capital required, Ratio (as a percent) |  |  | 8.50% | 8.50% | 8.50% |  |
Total capital to risk-weighted assets |  |  |  |  |  |  |
Minimum capital required, Capital Amount |  |  | $ 1,255,461 | $ 1,233,338 | $ 1,184,855 |  |
Minimum capital required, Ratio (as a percent) |  |  | 10.50% | 10.50% | 10.50% |  |
Tier I capital to average assets (leverage ratio) |  |  |  |  |  |  |
Minimum capital required, Capital Amount |  |  | $ 601,691 | $ 591,731 | $ 551,366 |  |
Minimum capital required, Ratio (as a percent) |  |  | 4.00% | 4.00% | 4.00% |  |
South State Bank (the Bank) |  |  |  |  |  |  |
Capital ratios |  |  |  |  |  |  |
Tier One Risk Based Capital to Risk Weighted Assets |  |  | 11.62% | 12.07% | 12.67% |  |
Capital to Risk Weighted Assets (as a percent) |  |  | 12.31% | 12.60% | 13.17% |  |
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets (as a percent) |  |  | 8.00% | 8.00% | 8.00% |  |
Common equity Tier 1 to risk-weighted assets |  |  |  |  |  |  |
Actual, Capital Amount |  |  | $ 1,388,822 | $ 1,417,616 | $ 1,429,219 |  |
Actual, Ratio (as a percent) |  |  | 11.62% | 12.07% | 12.67% |  |
Required to be considered well capitalized, Capital Amount |  |  | $ 777,137 | $ 763,488 | $ 733,448 |  |
Required to be considered well capitalized, Ratio (as a percent) |  |  | 6.50% | 6.50% | 6.50% |  |
Tier I capital to risk-weighted assets |  |  |  |  |  |  |
Actual, Capital Amount |  |  | $ 1,388,822 | $ 1,417,616 | $ 1,429,219 |  |
Actual, Ratio (as a percent) |  |  | 11.62% | 12.07% | 12.67% |  |
Required to be considered well capitalized, Capital Amount |  |  | $ 956,476 | $ 939,677 | $ 902,706 |  |
Required to be considered well capitalized, Ratio (as a percent) |  |  | 8.00% | 8.00% | 8.00% |  |
Total capital to risk-weighted assets |  |  |  |  |  |  |
Actual, Capital Amount |  |  | $ 1,471,745 | $ 1,479,942 | $ 1,486,075 |  |
Actual, Ratio (as a percent) |  |  | 12.31% | 12.60% | 13.17% |  |
Required to be considered well capitalized, Capital Amount |  |  | $ 1,195,595 | $ 1,174,597 | $ 1,128,382 |  |
Required to be considered well capitalized, Ratio (as a percent) |  |  | 10.00% | 10.00% | 10.00% |  |
Tier I capital to average assets (leverage ratio) |  |  |  |  |  |  |
Actual, Capital Amount |  |  | $ 1,388,822 | $ 1,417,616 | $ 1,429,219 |  |
Actual, Ratio (as a percent) |  |  | 9.24% | 9.59% | 10.37% |  |
Required to be considered well capitalized, Capital Amount |  |  | $ 751,912 | $ 739,490 | $ 689,022 |  |
Required to be considered well capitalized, Ratio (as a percent) |  |  | 5.00% | 5.00% | 5.00% |  |
South State Bank (the Bank) | Fully Phased-In |  |  |  |  |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |  |  |  |  |
Minimum capital required, Capital Amount |  |  | $ 836,917 | $ 822,218 | $ 789,867 |  |
Minimum capital required, Ratio (as a percent) |  |  | 7.00% | 7.00% | 7.00% |  |
Tier I capital to risk-weighted assets |  |  |  |  |  |  |
Minimum capital required, Capital Amount |  |  | $ 1,016,256 | $ 998,407 | $ 959,125 |  |
Minimum capital required, Ratio (as a percent) |  |  | 8.50% | 8.50% | 8.50% |  |
Total capital to risk-weighted assets |  |  |  |  |  |  |
Minimum capital required, Capital Amount |  |  | $ 1,255,375 | $ 1,233,327 | $ 1,184,801 |  |
Minimum capital required, Ratio (as a percent) |  |  | 10.50% | 10.50% | 10.50% |  |
Tier I capital to average assets (leverage ratio) |  |  |  |  |  |  |
Minimum capital required, Capital Amount |  |  | $ 601,530 | $ 591,592 | $ 551,218 |  |
Minimum capital required, Ratio (as a percent) |  |  | 4.00% | 4.00% | 4.00% |  |
[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.

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- Definition The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 + Details
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