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Summary of Significant Accounting Policies - Reclassification and Correction (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Assets:        
Effect to deposits in other financial institutions (restricted cash) $ 237,808   $ 251,520  
Net effect to total assets 45,144,838   44,902,024  
Liabilities:        
Effect to derivative liabilities 954,788   804,486  
Net effect to total liabilities 39,597,829   39,368,926  
Shareholders' equity:        
Effect to shareholders' equity 5,547,009 $ 5,249,004 5,533,098 $ 5,074,927
Liabilities and shareholders' equity 45,144,838   $ 44,902,024  
Interest income:        
Effect to interest income on federal funds sold and interest-earning deposits with banks 8,254 8,921    
Net effect to interest income 517,255 450,409    
Net effect to net interest income 343,936 381,263    
Noninterest income:        
Net effect to noninterest income 71,558 71,355    
Net effect to net income $ 115,056 139,926    
Effect to Tier 1 leverage ratio 0.0958   0.0942  
Effect to CET 1 risk-based capital ratio 0.1195%   11.75%  
Effect to Total risk-based capital ratio 0.1432   0.1408  
SouthState Bank (the Bank)        
Noninterest income:        
Effect to Tier 1 leverage ratio 0.1014   0.1003  
Effect to CET 1 risk-based capital ratio 0.1267%   12.52%  
Effect to Total risk-based capital ratio 0.1393   0.1375  
Correspondent banking and capital markets income        
Noninterest income:        
Noninterest income $ 4,311 $ 13,594