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Regulatory Matters (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Capital ratios      
Capital conversion buffer common equity Tier 1 of risk-weighted assets (as a percent)   2.50%  
Common equity Tier 1 to risk-weighted assets      
Actual, Capital Amount $ 1,326,725   $ 1,335,826
Actual, Ratio (as a percent) 11.30%   12.05%
Required to be considered well capitalized, Capital Amount $ 763,495   $ 720,844
Required to be considered well capitalized, Ratio (as a percent) 6.50%   6.50%
Tier I capital to risk-weighted assets      
Actual, Capital Amount $ 1,438,995   $ 1,447,428
Actual, Ratio (as a percent) 12.25%   13.05%
Minimum capital required, Ratio (as a percent) 6.00%   4.00%
Required to be considered well capitalized, Capital Amount $ 939,686   $ 887,192
Required to be considered well capitalized, Ratio (as a percent) 8.00%   8.00%
Total capital to risk-weighted assets      
Actual, Capital Amount $ 1,501,321   $ 1,503,561
Actual, Ratio (as a percent) 12.78%   13.56%
Minimum capital required, Ratio (as a percent) 8.00%    
Required to be considered well capitalized, Capital Amount $ 1,174,607   $ 1,108,990
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 $ 1,438,995   $ 1,447,428
Actual, Ratio (as a percent) 9.73%   10.65%
Minimum capital required, Ratio (as a percent) 4.00%    
Required to be considered well capitalized, Capital Amount $ 739,664   $ 679,383
Required to be considered well capitalized, Ratio (as a percent) 5.00%   5.00%
Phase-In Schedule      
Common equity Tier 1 to risk-weighted assets      
Minimum capital required, Capital Amount $ 822,225   $ 706,981
Minimum capital required, Ratio (as a percent) 7.00%   6.38%
Tier I capital to risk-weighted assets      
Minimum capital required, Capital Amount $ 998,416   $ 873,330
Minimum capital required, Ratio (as a percent) 8.50%   7.88%
Total capital to risk-weighted assets      
Minimum capital required, Capital Amount $ 1,233,338   $ 1,095,128
Minimum capital required, Ratio (as a percent) 10.50%   9.88%
Tier I capital to average assets (leverage ratio)      
Minimum capital required, Capital Amount $ 591,731   $ 543,506
Minimum capital required, Ratio (as a percent) 4.00%   4.00%
Fully Phased-In      
Common equity Tier 1 to risk-weighted assets      
Minimum capital required, Capital Amount $ 822,225   $ 776,293
Minimum capital required, Ratio (as a percent) 7.00%   7.00%
Tier I capital to risk-weighted assets      
Minimum capital required, Capital Amount $ 998,416   $ 942,642
Minimum capital required, Ratio (as a percent) 8.50%   8.50%
Total capital to risk-weighted assets      
Minimum capital required, Capital Amount $ 1,233,338   $ 1,164,440
Minimum capital required, Ratio (as a percent) 10.50%   10.50%
Tier I capital to average assets (leverage ratio)      
Minimum capital required, Capital Amount $ 591,731   $ 543,506
Minimum capital required, Ratio (as a percent) 4.00%   4.00%
South State Bank (the Bank)      
Common equity Tier 1 to risk-weighted assets      
Actual, Capital Amount $ 1,417,616   $ 1,427,764
Actual, Ratio (as a percent) 12.07%   12.87%
Required to be considered well capitalized, Capital Amount $ 763,488   $ 720,902
Required to be considered well capitalized, Ratio (as a percent) 6.50%   6.50%
Tier I capital to risk-weighted assets      
Actual, Capital Amount $ 1,417,616   $ 1,427,764
Actual, Ratio (as a percent) 12.07%   12.87%
Required to be considered well capitalized, Capital Amount $ 939,677   $ 887,264
Required to be considered well capitalized, Ratio (as a percent) 8.00%   8.00%
Total capital to risk-weighted assets      
Actual, Capital Amount $ 1,479,942   $ 1,483,897
Actual, Ratio (as a percent) 12.60%   13.38%
Required to be considered well capitalized, Capital Amount $ 1,174,597   $ 1,109,080
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 $ 1,417,616   $ 1,427,764
Actual, Ratio (as a percent) 9.59%   10.51%
Required to be considered well capitalized, Capital Amount $ 739,490   $ 679,234
Required to be considered well capitalized, Ratio (as a percent) 5.00%   5.00%
South State Bank (the Bank) | Phase-In Schedule      
Common equity Tier 1 to risk-weighted assets      
Minimum capital required, Capital Amount $ 822,218   $ 707,039
Minimum capital required, Ratio (as a percent) 7.00%   6.38%
Tier I capital to risk-weighted assets      
Minimum capital required, Capital Amount $ 998,407   $ 873,401
Minimum capital required, Ratio (as a percent) 8.50%   7.88%
Total capital to risk-weighted assets      
Minimum capital required, Capital Amount $ 1,233,327   $ 1,095,217
Minimum capital required, Ratio (as a percent) 10.50%   9.88%
Tier I capital to average assets (leverage ratio)      
Minimum capital required, Capital Amount $ 591,592   $ 543,387
Minimum capital required, Ratio (as a percent) 4.00%   4.00%
South State Bank (the Bank) | Fully Phased-In      
Common equity Tier 1 to risk-weighted assets      
Minimum capital required, Capital Amount $ 822,218   $ 776,356
Minimum capital required, Ratio (as a percent) 7.00%   7.00%
Tier I capital to risk-weighted assets      
Minimum capital required, Capital Amount $ 998,407   $ 942,718
Minimum capital required, Ratio (as a percent) 8.50%   8.50%
Total capital to risk-weighted assets      
Minimum capital required, Capital Amount $ 1,233,327   $ 1,164,534
Minimum capital required, Ratio (as a percent) 10.50%   10.50%
Tier I capital to average assets (leverage ratio)      
Minimum capital required, Capital Amount $ 591,592   $ 543,387
Minimum capital required, Ratio (as a percent) 4.00%   4.00%
Minimum      
Common equity Tier 1 to risk-weighted assets      
Actual, Ratio (as a percent) 4.50%