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Regulatory Matters (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 31, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 01, 2019
Capital ratios                    
Capital conversion buffer common equity Tier 1 of risk-weighted assets (as a percent)                   2.50%
Additional allowance for credit losses for loans         $ 356,444 $ 301,807 $ 457,309   $ 56,927  
Deferred tax assets         177,801 64,964        
Retained earnings         $ 1,347,042 997,657        
Phasing out percentage         25.00%          
Trust preferred securities redeemed           39,900        
Common equity Tier 1 to risk-weighted assets                    
Actual, Capital Amount         $ 3,788,106 $ 3,201,644        
Actual, Ratio (as a percent)         0.1096% 0.1176%        
Required to be considered well capitalized, Capital Amount         $ 2,247,530 $ 1,769,049        
Required to be considered well capitalized, Ratio (as a percent)         0.065% 0.065%        
Tier I capital to risk-weighted assets                    
Actual, Capital Amount         $ 3,788,106 $ 3,201,644        
Actual, Ratio (as a percent)         0.1096 0.1176        
Minimum capital required, Capital Amount         $ 2,766,190 $ 2,177,291        
Minimum capital required, Ratio (as a percent)         0.0800 0.0800        
Total capital to risk-weighted assets                    
Actual, Capital Amount         $ 4,485,397 $ 3,692,674        
Actual, Ratio (as a percent)         0.1297 0.1357        
Required to be considered well capitalized, Capital Amount         $ 3,457,738 $ 2,721,613        
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         $ 3,788,106 $ 3,201,644        
Actual, Ratio (as a percent)         0.0872 0.0808        
Required to be considered well capitalized, Capital Amount         $ 2,171,239 $ 1,980,756        
Required to be considered well capitalized, Ratio (as a percent)         0.0500 0.0500        
Adjustments                    
Capital ratios                    
Additional allowance for credit losses for loans                 111,365  
Common equity Tier 1 to risk-weighted assets                    
Actual, Ratio (as a percent)           0.0001%        
Total capital to risk-weighted assets                    
Actual, Ratio (as a percent)           0.0001        
Tier I capital to average assets (leverage ratio)                    
Actual, Ratio (as a percent)           0.0003        
ASU 2016-13                    
Capital ratios                    
Additional allowance for credit losses for loans               $ 54,400    
Deferred tax assets               12,600    
Retained earnings               44,800    
ASU 2016-13 | Adjustments                    
Capital ratios                    
Additional allowance for credit losses for loans             $ 109,442   $ 51,030  
Additional reserve for unfunded commitments               $ 6,400    
Subordinated Debt.                    
Capital ratios                    
Trust preferred securities redeemed $ 13,000 $ 13,000   $ 25,000            
Amount of redemption of subordinated debt qualify for tier 2 capital     $ 13,000              
Atlantic Capital | Subordinated Debt.                    
Capital ratios                    
Amount of subordinated debt assumed qualify as Tier 2 capital     $ 75,000              
SouthState Bank (the Bank)                    
Common equity Tier 1 to risk-weighted assets                    
Actual, Capital Amount         $ 4,074,045 $ 3,431,069        
Actual, Ratio (as a percent)         0.118% 0.1263%        
Required to be considered well capitalized, Capital Amount         $ 2,244,481 $ 1,765,448        
Required to be considered well capitalized, Ratio (as a percent)         0.065% 0.065%        
Tier I capital to risk-weighted assets                    
Actual, Capital Amount         $ 4,074,045 $ 3,431,069        
Actual, Ratio (as a percent)         0.1180 0.1263        
Minimum capital required, Capital Amount         $ 2,762,438 $ 2,172,859        
Minimum capital required, Ratio (as a percent)         0.0800 0.0800        
Total capital to risk-weighted assets                    
Actual, Capital Amount         $ 4,381,336 $ 3,594,099        
Actual, Ratio (as a percent)         0.1269 0.1323        
Required to be considered well capitalized, Capital Amount         $ 3,453,047 $ 2,716,074        
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         $ 4,074,045 $ 3,431,069        
Actual, Ratio (as a percent)         0.0939 0.0868        
Required to be considered well capitalized, Capital Amount         $ 2,170,412 $ 1,977,216        
Required to be considered well capitalized, Ratio (as a percent)         0.0500 0.0500        
SouthState Bank (the Bank) | Adjustments                    
Common equity Tier 1 to risk-weighted assets                    
Actual, Ratio (as a percent)           0.0001%        
Total capital to risk-weighted assets                    
Actual, Ratio (as a percent)           0.0001        
Tier I capital to average assets (leverage ratio)                    
Actual, Ratio (as a percent)           0.0003        
Fully Phased-In                    
Common equity Tier 1 to risk-weighted assets                    
Minimum capital required, Capital Amount         $ 2,420,417 $ 1,905,129        
Minimum capital required, Ratio (as a percent)         0.07% 0.07%        
Tier I capital to risk-weighted assets                    
Required to be considered well capitalized, Capital Amount         $ 2,939,077 $ 2,313,371        
Required to be considered well capitalized, Ratio (as a percent)         0.0850 0.0850        
Total capital to risk-weighted assets                    
Minimum capital required, Capital Amount         $ 3,630,625 $ 2,857,694        
Minimum capital required, Ratio (as a percent)         0.1050 0.1050        
Tier I capital to average assets (leverage ratio)                    
Minimum capital required, Capital Amount         $ 1,736,991 $ 1,584,605        
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                    
Minimum capital required, Capital Amount         $ 2,417,133 $ 1,901,252        
Minimum capital required, Ratio (as a percent)         0.07% 0.07%        
Tier I capital to risk-weighted assets                    
Required to be considered well capitalized, Capital Amount         $ 2,935,090 $ 2,308,663        
Required to be considered well capitalized, Ratio (as a percent)         0.0850 0.0850        
Total capital to risk-weighted assets                    
Minimum capital required, Capital Amount         $ 3,625,700 $ 2,851,878        
Minimum capital required, Ratio (as a percent)         0.1050 0.1050        
Tier I capital to average assets (leverage ratio)                    
Minimum capital required, Capital Amount         $ 1,736,330 $ 1,581,773        
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)         4.50%          
Tier I capital to risk-weighted assets                    
Required to be considered well capitalized, 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