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Capital Ratios (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Jan. 01, 2019
Capital Ratios      
Minimum capital required, capital amount $ 3,565,394 $ 2,522,926  
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 $ 5,847,433 $ 4,547,314  
Actual, ratio (as a percent) 11.48% 12.62%  
Minimum capital required, capital amount $ 4,329,408 $ 3,063,552  
Minimum capital required, ratio (as a percent) 0.07% 7.00%  
Required to be considered well capitalized, capital amount $ 3,310,723 $ 2,342,717  
Required to be considered well capitalized, ratio (as a percent) 0.065% 0.065%  
Tier I capital to risk-weighted assets      
Actual, capital amount $ 5,847,433 $ 4,547,314  
Actual, ratio (as a percent) 0.1148 0.1262  
Minimum capital required, capital amount $ 4,329,408 $ 3,063,552  
Minimum capital required, ratio (as a percent) 0.085 0.085  
Required to be considered well capitalized, capital amount $ 4,074,737 $ 2,883,343  
Required to be considered well capitalized, ratio (as a percent) 0.08 0.08  
Total capital to risk-weighted assets      
Actual, capital amount $ 7,123,149 $ 5,391,194  
Actual, ratio (as a percent) 0.1398 0.1496  
Minimum capital required, capital amount $ 5,348,092 $ 3,784,388  
Minimum capital required, ratio (as a percent) 0.105 0.105  
Required to be considered well capitalized, capital amount $ 5,093,421 $ 3,604,179  
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 $ 5,847,433 $ 4,547,314  
Actual, ratio (as a percent) 0.0936 0.1004  
Minimum capital required, capital amount $ 2,500,222 $ 1,810,985  
Minimum capital required, ratio (as a percent) 0.04 0.04  
Required to be considered well capitalized, capital amount $ 3,125,277 $ 2,263,732  
Required to be considered well capitalized, ratio (as a percent) 0.05 0.05  
SouthState Bank (the Bank)      
Capital Ratios      
Minimum capital required, capital amount $ 3,561,851 $ 2,520,065  
Common equity Tier 1 to risk-weighted assets      
Actual, capital amount $ 6,421,904 $ 4,817,945  
Actual, ratio (as a percent) 12.62% 13.38%  
Minimum capital required, capital amount $ 4,325,104 $ 3,060,079  
Minimum capital required, ratio (as a percent) 0.07% 7.00%  
Required to be considered well capitalized, capital amount $ 3,307,433 $ 2,340,060  
Required to be considered well capitalized, ratio (as a percent) 0.065% 0.065%  
Tier I capital to risk-weighted assets      
Actual, capital amount $ 6,421,904 $ 4,817,945  
Actual, ratio (as a percent) 0.1262 0.1338  
Minimum capital required, capital amount $ 4,325,104 $ 3,060,079  
Minimum capital required, ratio (as a percent) 0.085 0.085  
Required to be considered well capitalized, capital amount $ 4,070,686 $ 2,880,074  
Required to be considered well capitalized, ratio (as a percent) 0.08 0.08  
Total capital to risk-weighted assets      
Actual, capital amount $ 7,002,021 $ 5,271,725  
Actual, ratio (as a percent) 0.1376 0.1464  
Minimum capital required, capital amount $ 5,342,776 $ 3,780,097  
Minimum capital required, ratio (as a percent) 0.105 0.105  
Required to be considered well capitalized, capital amount $ 5,088,358 $ 3,600,093  
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 $ 6,421,904 $ 4,817,945  
Actual, ratio (as a percent) 0.1028 0.1064  
Minimum capital required, capital amount $ 2,499,168 $ 1,810,497  
Minimum capital required, ratio (as a percent) 0.04 0.04  
Required to be considered well capitalized, capital amount $ 3,123,960 $ 2,263,121  
Required to be considered well capitalized, ratio (as a percent) 0.05 0.05  
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