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Regulatory Matters (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Jan. 31, 2020
Regulatory Matters            
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   $ 4,547,314 $ 4,159,187      
Actual, Ratio (as a percent)   0.1262% 0.1175%      
Required to be considered well capitalized, Capital Amount   $ 2,342,717 $ 2,300,003      
Required to be considered well capitalized, Ratio (as a percent)   0.065% 0.065%      
Tier One Risk Based Capital to Risk Weighted Assets [Abstract]            
Actual, Capital Amount   $ 4,547,314 $ 4,159,187      
Actual, Ratio (as a percent)   0.1262 0.1175      
Tier One Risk Based Capital Required to be Well Capitalized   $ 2,883,343 $ 2,830,773      
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets (as a percent)   0.08 0.08      
Total capital to risk-weighted assets            
Actual, Capital Amount   $ 5,391,194 $ 4,983,012      
Capital to Risk Weighted Assets (as a percent)   0.1496 0.1408      
Required to be considered well capitalized, Capital Amount   $ 3,604,179 $ 3,538,466      
Required to be considered well capitalized, Ratio (as a percent)   0.10 0.10      
Tier One Leverage Capital to Average Assets [Abstract]            
Tier One Leverage Capital   $ 4,547,314 $ 4,159,187      
Tier One Leverage Capital to Average Assets (as a percent)   0.1004 0.0942      
Tier One Leverage Capital Required to be Well Capitalized   $ 2,263,732 $ 2,206,619      
Tier One Leverage Capital Required to be Well Capitalized to Average Assets (as a percent)   0.05 0.05      
Additional allowance for credit losses for loans   $ 465,280 $ 456,573 $ 356,444 $ 301,807  
Deferred tax assets   179,884 164,354      
Retained earnings   $ 2,046,809 $ 1,685,166      
Phasing out percentage 25.00%          
Fully Phased-In            
Common equity Tier 1 to risk-weighted assets            
Minimum capital required, Ratio (as a percent)   0.07% 0.07%      
Minimum capital required, Capital Amount   $ 2,522,926 $ 2,476,926      
Tier One Risk Based Capital to Risk Weighted Assets [Abstract]            
Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy With Buffer, Minimum   $ 3,063,552 $ 3,007,696      
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy With Buffer, Minimum   0.085 0.085      
Total capital to risk-weighted assets            
Minimum capital required, Capital Amount   $ 3,784,388 $ 3,715,389      
Minimum capital required, Ratio (as a percent)   0.105 0.105      
Tier One Leverage Capital to Average Assets [Abstract]            
Tier One Leverage Capital Required for Capital Adequacy   $ 1,810,985 $ 1,765,295      
Minimum capital required, Ratio (as a percent)   0.04 0.04      
ASU 2016-13            
Tier One Leverage Capital to Average Assets [Abstract]            
Additional allowance for credit losses for loans           $ 54,400
Deferred tax assets           12,600
Retained earnings           44,800
ASU 2016-13 | Adjustments            
Tier One Leverage Capital to Average Assets [Abstract]            
Additional reserve for unfunded commitments           $ 6,400
Minimum            
Common equity Tier 1 to risk-weighted assets            
Actual, Ratio (as a percent)   4.50%        
Tier One Risk Based Capital to Risk Weighted Assets [Abstract]            
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy With Buffer, Minimum   6        
Total capital to risk-weighted assets            
Capital to Risk Weighted Assets (as a percent)   0.04        
Tier One Leverage Capital to Average Assets [Abstract]            
Tier One Leverage Capital to Average Assets (as a percent)   0.08        
SouthState Bank (the Bank)            
Common equity Tier 1 to risk-weighted assets            
Actual, Capital Amount   $ 4,817,945 $ 4,424,466      
Actual, Ratio (as a percent)   0.1338% 0.1252%      
Required to be considered well capitalized, Capital Amount   $ 2,340,060 $ 2,297,250      
Required to be considered well capitalized, Ratio (as a percent)   0.065% 0.065%      
Tier One Risk Based Capital to Risk Weighted Assets [Abstract]            
Actual, Capital Amount   $ 4,817,945 $ 4,424,466      
Actual, Ratio (as a percent)   0.1338 0.1252      
Tier One Risk Based Capital Required to be Well Capitalized   $ 2,880,074 $ 2,827,384      
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets (as a percent)   0.08 0.08      
Total capital to risk-weighted assets            
Actual, Capital Amount   $ 5,271,725 $ 4,858,292      
Capital to Risk Weighted Assets (as a percent)   0.1464 0.1375      
Required to be considered well capitalized, Capital Amount   $ 3,600,093 $ 3,534,230      
Required to be considered well capitalized, Ratio (as a percent)   0.10 0.10      
Tier One Leverage Capital to Average Assets [Abstract]            
Tier One Leverage Capital   $ 4,817,945 $ 4,424,466      
Tier One Leverage Capital to Average Assets (as a percent)   0.1064 0.1003      
Tier One Leverage Capital Required to be Well Capitalized   $ 2,263,121 $ 2,205,921      
Tier One Leverage Capital Required to be Well Capitalized to Average Assets (as a percent)   0.05 0.05      
SouthState Bank (the Bank) | Fully Phased-In            
Common equity Tier 1 to risk-weighted assets            
Minimum capital required, Ratio (as a percent)   0.07% 0.07%      
Minimum capital required, Capital Amount   $ 2,520,065 $ 2,473,961      
Tier One Risk Based Capital to Risk Weighted Assets [Abstract]            
Banking Regulation, Tier 1 Risk-Based Capital, Capital Adequacy With Buffer, Minimum   $ 3,060,079 $ 3,004,096      
Banking Regulation, Tier 1 Risk-Based Capital Ratio, Capital Adequacy With Buffer, Minimum   0.085 0.085      
Total capital to risk-weighted assets            
Minimum capital required, Capital Amount   $ 3,780,097 $ 3,710,942      
Minimum capital required, Ratio (as a percent)   0.105 0.105      
Tier One Leverage Capital to Average Assets [Abstract]            
Tier One Leverage Capital Required for Capital Adequacy   $ 1,810,497 $ 1,764,736      
Minimum capital required, Ratio (as a percent)   0.04 0.04