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Regulatory Matters (Details) - USD ($)
$ in Thousands
Dec. 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%
Risk-weighted assets ratio 6      
Tier One Risk Based Capital to Risk Weighted Assets 11.77   12.25  
Capital to Risk Weighted Assets (as a percent) 14.24   12.78  
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets (as a percent) 8.00   8.00  
Additional allowance for credit losses for loans $ 457,309 $ 54,400 $ 56,927  
Deferred tax assets 110,946   31,316  
Additional reserve for unfunded commitments   6,400    
Retained earnings 657,451   679,895  
Common equity Tier 1 to risk-weighted assets        
Actual, Capital Amount $ 3,010,174   $ 1,326,725  
Actual, Ratio (as a percent) 11.77%   11.30%  
Minimum capital required, Ratio (as a percent) 4.50%      
Required to be considered well capitalized, Capital Amount $ 1,662,128   $ 763,495  
Required to be considered well capitalized, Ratio (as a percent) 6.50%   6.50%  
Tier I capital to risk-weighted assets        
Actual, Capital Amount $ 3,010,174   $ 1,438,995  
Actual, Ratio (as a percent) 11.77   12.25  
Minimum capital required, Ratio (as a percent) 4      
Required to be considered well capitalized, Capital Amount $ 2,045,696   $ 939,686  
Required to be considered well capitalized, Ratio (as a percent) 8.00   8.00  
Total capital to risk-weighted assets        
Actual, Capital Amount $ 3,642,039   $ 1,501,321  
Actual, Ratio (as a percent) 14.24   12.78  
Minimum capital required, Ratio (as a percent) 8      
Required to be considered well capitalized, Capital Amount $ 2,557,120   $ 1,174,607  
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 $ 3,010,174   $ 1,438,995  
Actual, Ratio (as a percent) 8.27   9.73  
Required to be considered well capitalized, Capital Amount $ 1,818,919   $ 739,664  
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   54,438    
Deferred tax assets   12,639    
Additional reserve for unfunded commitments   6,400    
Retained earnings $ 44,800 $ (44,820)    
Fully Phased-In        
Common equity Tier 1 to risk-weighted assets        
Minimum capital required, Capital Amount $ 1,789,984   $ 822,225  
Minimum capital required, Ratio (as a percent) 7.00%   7.00%  
Tier I capital to risk-weighted assets        
Minimum capital required, Capital Amount $ 2,173,552   $ 998,416  
Minimum capital required, Ratio (as a percent) 8.50   8.50  
Total capital to risk-weighted assets        
Minimum capital required, Capital Amount $ 2,684,976   $ 1,233,338  
Minimum capital required, Ratio (as a percent) 10.50   10.50  
Tier I capital to average assets (leverage ratio)        
Minimum capital required, Capital Amount $ 1,455,135   $ 591,731  
Minimum capital required, Ratio (as a percent) 4.00   4.00  
South State Bank (the Bank)        
Capital ratios        
Tier One Risk Based Capital to Risk Weighted Assets 12.39   12.07  
Capital to Risk Weighted Assets (as a percent) 13.33   12.60  
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets (as a percent) 8.00   8.00  
Common equity Tier 1 to risk-weighted assets        
Actual, Capital Amount $ 3,157,098   $ 1,417,616  
Actual, Ratio (as a percent) 12.39%   12.07%  
Required to be considered well capitalized, Capital Amount $ 1,656,683   $ 763,488  
Required to be considered well capitalized, Ratio (as a percent) 6.50%   6.50%  
Tier I capital to risk-weighted assets        
Actual, Capital Amount $ 3,157,098   $ 1,417,616  
Actual, Ratio (as a percent) 12.39   12.07  
Required to be considered well capitalized, Capital Amount $ 2,038,994   $ 939,677  
Required to be considered well capitalized, Ratio (as a percent) 8.00   8.00  
Total capital to risk-weighted assets        
Actual, Capital Amount $ 3,397,463   $ 1,479,942  
Actual, Ratio (as a percent) 13.33   12.60  
Required to be considered well capitalized, Capital Amount $ 2,548,743   $ 1,174,597  
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 $ 3,157,098   $ 1,417,616  
Actual, Ratio (as a percent) 8.71   9.59  
Required to be considered well capitalized, Capital Amount $ 1,813,250   $ 739,490  
Required to be considered well capitalized, Ratio (as a percent) 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 $ 1,784,120   $ 822,218  
Minimum capital required, Ratio (as a percent) 7.00%   7.00%  
Tier I capital to risk-weighted assets        
Minimum capital required, Capital Amount $ 2,166,432   $ 998,407  
Minimum capital required, Ratio (as a percent) 8.50   8.50  
Total capital to risk-weighted assets        
Minimum capital required, Capital Amount $ 2,676,180   $ 1,233,327  
Minimum capital required, Ratio (as a percent) 10.50   10.50  
Tier I capital to average assets (leverage ratio)        
Minimum capital required, Capital Amount $ 1,450,600   $ 591,592  
Minimum capital required, Ratio (as a percent) 4.00   4.00