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Regulatory Matters (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 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%
Risk-weighted assets ratio | 6 |  |  |  |
Additional allowance for credit losses for loans | $ 301,807 | $ 457,309 | $ 54,400 | $ 56,927 |
Deferred tax assets | 64,964 | 110,946 |  |  |
Additional reserve for unfunded commitments |  |  | 6,400 |  |
Retained earnings | 997,657 | 657,451 |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |  |  |
Actual, Capital Amount | $ 3,201,644 | $ 3,010,174 |  |  |
Actual, Ratio (as a percent) | 11.75% | 11.77% |  |  |
Minimum capital required, Ratio (as a percent) | 4.50% |  |  |  |
Required to be considered well capitalized, Capital Amount | $ 1,770,629 | $ 1,662,122 |  |  |
Required to be considered well capitalized, Ratio (as a percent) | 6.50% | 6.50% |  |  |
Tier I capital to risk-weighted assets |  |  |  |  |
Actual, Capital Amount | $ 3,201,644 | $ 3,010,174 |  |  |
Actual, Ratio (as a percent) | 11.75 | 11.77 |  |  |
Minimum capital required, Ratio (as a percent) | 4 |  |  |  |
Required to be considered well capitalized, Capital Amount | $ 2,179,236 | $ 2,045,688 |  |  |
Required to be considered well capitalized, Ratio (as a percent) | 8.00 | 8.00 |  |  |
Total capital to risk-weighted assets |  |  |  |  |
Actual, Capital Amount | $ 3,692,674 | $ 3,642,039 |  |  |
Actual, Ratio (as a percent) | 13.56 | 14.24 |  |  |
Minimum capital required, Ratio (as a percent) | 8 |  |  |  |
Required to be considered well capitalized, Capital Amount | $ 2,724,045 | $ 2,557,110 |  |  |
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 | $ 3,201,644 | $ 3,010,174 |  |  |
Actual, Ratio (as a percent) | 8.05 | 8.27 |  |  |
Required to be considered well capitalized, Capital Amount | $ 1,987,556 | $ 1,818,924 |  |  |
Required to be considered well capitalized, Ratio (as a percent) | 5.00 | 5.00 |  |  |
Adjustments |  |  |  |  |
Capital ratios |  |  |  |  |
Additional allowance for credit losses for loans |  | $ 457,309 |  | 111,365 |
ASU 2016-13 |  |  |  |  |
Capital ratios |  |  |  |  |
Additional allowance for credit losses for loans |  |  | 54,438 |  |
Deferred tax assets |  |  | 12,639 |  |
Additional reserve for unfunded commitments |  |  | 6,400 |  |
Retained earnings | $ 44,800 |  | (44,820) |  |
ASU 2016-13 | Adjustments |  |  |  |  |
Capital ratios |  |  |  |  |
Additional allowance for credit losses for loans |  | 109,442 | 56,927 | $ 51,030 |
Deferred tax assets |  |  | 31,316 |  |
Retained earnings |  |  | $ 679,895 |  |
SouthState Bank (the Bank) |  |  |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |  |  |
Actual, Capital Amount | $ 3,431,069 | $ 3,157,098 |  |  |
Actual, Ratio (as a percent) | 12.62% | 12.39% |  |  |
Required to be considered well capitalized, Capital Amount | $ 1,767,029 | $ 1,656,677 |  |  |
Required to be considered well capitalized, Ratio (as a percent) | 6.50% | 6.50% |  |  |
Tier I capital to risk-weighted assets |  |  |  |  |
Actual, Capital Amount | $ 3,431,069 | $ 3,157,098 |  |  |
Actual, Ratio (as a percent) | 12.62 | 12.39 |  |  |
Required to be considered well capitalized, Capital Amount | $ 2,174,804 | $ 2,038,987 |  |  |
Required to be considered well capitalized, Ratio (as a percent) | 8.00 | 8.00 |  |  |
Total capital to risk-weighted assets |  |  |  |  |
Actual, Capital Amount | $ 3,594,099 | $ 3,397,463 |  |  |
Actual, Ratio (as a percent) | 13.22 | 13.33 |  |  |
Required to be considered well capitalized, Capital Amount | $ 2,718,505 | $ 2,548,733 |  |  |
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 | $ 3,431,069 | $ 3,157,098 |  |  |
Actual, Ratio (as a percent) | 8.65 | 8.71 |  |  |
Required to be considered well capitalized, Capital Amount | $ 1,984,015 | $ 1,813,255 |  |  |
Required to be considered well capitalized, Ratio (as a percent) | 5.00 | 5.00 |  |  |
Fully Phased-In |  |  |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |  |  |
Minimum capital required, Capital Amount | $ 1,906,831 | $ 1,789,977 |  |  |
Minimum capital required, Ratio (as a percent) | 7.00% | 7.00% |  |  |
Tier I capital to risk-weighted assets |  |  |  |  |
Minimum capital required, Capital Amount | $ 2,315,438 | $ 2,173,544 |  |  |
Minimum capital required, Ratio (as a percent) | 8.50 | 8.50 |  |  |
Total capital to risk-weighted assets |  |  |  |  |
Minimum capital required, Capital Amount | $ 2,860,247 | $ 2,684,966 |  |  |
Minimum capital required, Ratio (as a percent) | 10.50 | 10.50 |  |  |
Tier I capital to average assets (leverage ratio) |  |  |  |  |
Minimum capital required, Capital Amount | $ 1,590,045 | $ 1,455,139 |  |  |
Minimum capital required, Ratio (as a percent) | 4.00 | 4.00 |  |  |
Fully Phased-In | SouthState Bank (the Bank) |  |  |  |  |
Common equity Tier 1 to risk-weighted assets |  |  |  |  |
Minimum capital required, Capital Amount | $ 1,902,954 | $ 1,784,113 |  |  |
Minimum capital required, Ratio (as a percent) | 7.00% | 7.00% |  |  |
Tier I capital to risk-weighted assets |  |  |  |  |
Minimum capital required, Capital Amount | $ 2,310,730 | $ 2,166,423 |  |  |
Minimum capital required, Ratio (as a percent) | 8.50 | 8.50 |  |  |
Total capital to risk-weighted assets |  |  |  |  |
Minimum capital required, Capital Amount | $ 2,854,431 | $ 2,676,170 |  |  |
Minimum capital required, Ratio (as a percent) | 10.50 | 10.50 |  |  |
Tier I capital to average assets (leverage ratio) |  |  |  |  |
Minimum capital required, Capital Amount | $ 1,587,212 | $ 1,450,604 |  |  |
Minimum capital required, Ratio (as a percent) | 4.00 | 4.00 |  |  |

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