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Capital Ratios (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Mar. 31, 2023
Dec. 31, 2022
Jan. 31, 2020
Jan. 01, 2019
Regulatory Matters            
Capital conversion buffer common equity Tier 1 of risk-weighted assets (as a percent)           0.025%
Additional allowance for credit losses for loans $ 469,654 $ 456,573 $ 370,645 $ 356,444    
Deferred tax assets 170,818 164,354        
Additional reserve for unfunded commitments 53,200          
Retained earnings $ 1,749,215 1,685,166        
Phasing out percentage 25.00%          
Common equity Tier 1 to risk-weighted assets            
Actual, Capital Amount $ 4,203,524 $ 4,159,187        
Actual, Ratio (as a percent) 0.1195% 11.75%        
Required to be considered well capitalized, Capital Amount $ 2,285,534 $ 2,300,003        
Required to be considered well capitalized, Ratio (as a percent) 0.065% 6.50%        
Tier I capital to risk-weighted assets            
Actual, Capital Amount $ 4,203,524 $ 4,159,187        
Actual, Ratio (as a percent) 0.1195 0.1175        
Required to be considered well capitalized, Capital Amount $ 2,812,965 $ 2,830,773        
Required to be considered well capitalized, Ratio (as a percent) 0.0800 0.0800        
Total capital to risk-weighted assets            
Actual, Capital Amount $ 5,036,477 $ 4,983,012        
Actual, Ratio (as a percent) 0.1432 0.1408        
Required to be considered well capitalized, Capital Amount $ 3,516,206 $ 3,538,466        
Required to be considered well capitalized, Ratio (as a percent) 0.1000 0.1000        
Tier I capital to average assets (leverage ratio)            
Actual, Capital Amount $ 4,203,524 $ 4,159,187        
Actual, Ratio (as a percent) 0.0958 0.0942        
Required to be considered well capitalized, Capital Amount $ 2,193,216 $ 2,206,619        
Required to be considered well capitalized, Ratio (as a percent) 0.0500 0.0500        
ASU 2016-13            
Regulatory Matters            
Additional allowance for credit losses for loans         $ 54,400  
Deferred tax assets         12,600  
Retained earnings         44,800  
ASU 2016-13 | Adjustments            
Regulatory Matters            
Additional reserve for unfunded commitments         $ 6,400  
SouthState Bank (the Bank)            
Common equity Tier 1 to risk-weighted assets            
Actual, Capital Amount $ 4,447,788 $ 4,424,466        
Actual, Ratio (as a percent) 0.1267% 12.52%        
Required to be considered well capitalized, Capital Amount $ 2,282,481 $ 2,297,250        
Required to be considered well capitalized, Ratio (as a percent) 0.065% 6.50%        
Tier I capital to risk-weighted assets            
Actual, Capital Amount $ 4,447,788 $ 4,424,466        
Actual, Ratio (as a percent) 0.1267 0.1252        
Required to be considered well capitalized, Capital Amount $ 2,809,208 $ 2,827,384        
Required to be considered well capitalized, Ratio (as a percent) 0.0800 0.0800        
Total capital to risk-weighted assets            
Actual, Capital Amount $ 4,890,571 $ 4,858,292        
Actual, Ratio (as a percent) 0.1393 0.1375        
Required to be considered well capitalized, Capital Amount $ 3,511,510 $ 3,534,230        
Required to be considered well capitalized, Ratio (as a percent) 0.1000 0.1000        
Tier I capital to average assets (leverage ratio)            
Actual, Capital Amount $ 4,447,788 $ 4,424,466        
Actual, Ratio (as a percent) 0.1014 0.1003        
Required to be considered well capitalized, Capital Amount $ 2,192,423 $ 2,205,921        
Required to be considered well capitalized, Ratio (as a percent) 0.0500 0.0500        
Fully Phased-In            
Common equity Tier 1 to risk-weighted assets            
Actual, Capital Amount $ 2,461,344 $ 2,476,926        
Minimum capital required, Capital Amount $ 2,988,775 $ 3,007,696        
Minimum capital required, Ratio (as a percent) 0.07% 7.00%        
Tier I capital to risk-weighted assets            
Minimum capital required, Capital Amount $ 2,988,775 $ 3,007,696        
Minimum capital required, Ratio (as a percent) 0.0850 0.0850        
Total capital to risk-weighted assets            
Minimum capital required, Capital Amount $ 3,692,016 $ 3,715,389        
Minimum capital required, Ratio (as a percent) 0.1050 0.1050        
Tier I capital to average assets (leverage ratio)            
Minimum capital required, Capital Amount $ 1,754,572 $ 1,765,295        
Minimum capital required, Ratio (as a percent) 0.0400 0.0400        
Fully Phased-In | SouthState Bank (the Bank)            
Common equity Tier 1 to risk-weighted assets            
Actual, Capital Amount $ 2,458,057 $ 2,473,961        
Minimum capital required, Capital Amount $ 2,984,783 $ 3,004,096        
Minimum capital required, Ratio (as a percent) 0.07% 7.00%        
Tier I capital to risk-weighted assets            
Minimum capital required, Capital Amount $ 2,984,783 $ 3,004,096        
Minimum capital required, Ratio (as a percent) 0.0850 0.0850        
Total capital to risk-weighted assets            
Minimum capital required, Capital Amount $ 3,687,085 $ 3,710,942        
Minimum capital required, Ratio (as a percent) 0.1050 0.1050        
Tier I capital to average assets (leverage ratio)            
Minimum capital required, Capital Amount $ 1,753,939 $ 1,764,736        
Minimum capital required, Ratio (as a percent) 0.0400 0.0400        
Minimum            
Common equity Tier 1 to risk-weighted assets            
Actual, Ratio (as a percent) 0.045%          
Tier I capital to risk-weighted assets            
Minimum capital required, Ratio (as a percent) 0.06          
Total capital to risk-weighted assets            
Actual, Ratio (as a percent) 0.04          
Tier I capital to average assets (leverage ratio)            
Actual, Ratio (as a percent) 0.08