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Capital Ratios (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Jan. 01, 2019
Capital Ratios      
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 $ 5,993,557 $ 5,885,568  
Actual, ratio (as a percent) 0.1127% 11.36%  
Required to be considered well capitalized, capital amount $ 3,456,856 $ 3,366,948  
Required to be considered well capitalized, ratio (as a percent) 0.065% 6.50%  
Tier I capital to risk-weighted assets      
Actual, capital amount $ 5,993,557 $ 5,885,568  
Actual, ratio (as a percent) 0.1127 0.1136  
Required to be considered well capitalized, capital amount $ 4,254,592 $ 4,143,936  
Required to be considered well capitalized, ratio (as a percent) 0.08 0.08  
Total capital to risk-weighted assets      
Actual, capital amount $ 7,279,005 $ 7,166,829  
Actual, ratio (as a percent) 0.1369 0.1384  
Required to be considered well capitalized, capital amount $ 5,318,240 $ 5,179,920  
Required to be considered well capitalized, ratio (as a percent) 0.10 0.10  
Tier I capital to average assets (leverage ratio)      
Actual, capital amount $ 5,993,557 $ 5,885,568  
Actual, ratio (as a percent) 0.0938 0.0926  
Required to be considered well capitalized, capital amount $ 3,196,366 $ 3,179,117  
Required to be considered well capitalized, ratio (as a percent) 0.05 0.05  
SouthState Bank (the Bank)      
Common equity Tier 1 to risk-weighted assets      
Actual, capital amount $ 6,553,175 $ 6,496,379  
Actual, ratio (as a percent) 0.1233% 12.54%  
Required to be considered well capitalized, capital amount $ 3,455,369 $ 3,366,142  
Required to be considered well capitalized, ratio (as a percent) 0.065% 6.50%  
Tier I capital to risk-weighted assets      
Actual, capital amount $ 6,553,175 $ 6,496,379  
Actual, ratio (as a percent) 0.1233 0.1254  
Required to be considered well capitalized, capital amount $ 4,252,762 $ 4,142,944  
Required to be considered well capitalized, ratio (as a percent) 0.08 0.08  
Total capital to risk-weighted assets      
Actual, capital amount $ 7,143,023 $ 7,082,039  
Actual, ratio (as a percent) 0.1344 0.1368  
Required to be considered well capitalized, capital amount $ 5,315,953 $ 5,178,680  
Required to be considered well capitalized, ratio (as a percent) 0.10 0.10  
Tier I capital to average assets (leverage ratio)      
Actual, capital amount $ 6,553,175 $ 6,496,379  
Actual, ratio (as a percent) 0.1027 0.1022  
Required to be considered well capitalized, capital amount $ 3,191,950 $ 3,178,111  
Required to be considered well capitalized, ratio (as a percent) 0.05 0.05  
Fully Phased-In      
Common equity Tier 1 to risk-weighted assets      
Actual, capital amount $ 3,722,768 $ 3,625,944  
Minimum capital required, capital amount $ 4,520,504 $ 4,402,932  
Minimum capital required, ratio (as a percent) 0.07% 7.00%  
Tier I capital to risk-weighted assets      
Minimum capital required, capital amount $ 4,520,504 $ 4,402,932  
Minimum capital required, ratio (as a percent) 0.085 0.085  
Total capital to risk-weighted assets      
Minimum capital required, capital amount $ 5,584,152 $ 5,438,915  
Minimum capital required, ratio (as a percent) 0.105 0.105  
Tier I capital to average assets (leverage ratio)      
Minimum capital required, capital amount $ 2,557,093 $ 2,543,294  
Minimum capital required, ratio (as a percent) 0.04 0.04  
Fully Phased-In | SouthState Bank (the Bank)      
Common equity Tier 1 to risk-weighted assets      
Actual, capital amount $ 3,721,167 $ 3,625,076  
Minimum capital required, capital amount $ 4,518,560 $ 4,401,878  
Minimum capital required, ratio (as a percent) 0.07% 7.00%  
Tier I capital to risk-weighted assets      
Minimum capital required, capital amount $ 4,518,560 $ 4,401,878  
Minimum capital required, ratio (as a percent) 0.085 0.085  
Total capital to risk-weighted assets      
Minimum capital required, capital amount $ 5,581,750 $ 5,437,614  
Minimum capital required, ratio (as a percent) 0.105 0.105  
Tier I capital to average assets (leverage ratio)      
Minimum capital required, capital amount $ 2,553,560 $ 2,542,489  
Minimum capital required, ratio (as a percent) 0.04 0.04  
Minimum      
Common equity Tier 1 to risk-weighted assets      
Actual, ratio (as a percent) 4.50%    
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