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Capital Ratios (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Mar. 31, 2020
Jan. 01, 2020
Dec. 31, 2019
Jan. 01, 2019
Capital ratios                
Capital conversion buffer common equity Tier 1 of risk-weighted assets (as a percent)               2.50%
Decrease in capital due to redemption of debt $ 63,500              
Additional allowance for credit losses for loans 350,401 $ 406,460 $ 457,309 $ 434,608 $ 144,785   $ 56,927  
Deferred tax assets 36,714   110,946          
Additional reserve for unfunded commitments 31,000              
Retained earnings 836,584   657,451          
Common equity Tier 1 to risk-weighted assets                
Actual, Capital Amount $ 3,102,963   $ 3,010,174          
Actual, Ratio (as a percent) 12.14%   11.77%          
Minimum capital required, Capital Amount $ 1,789,798   $ 1,789,984          
Minimum capital required, Ratio (as a percent) 7.00%   7.00%          
Required to be considered well capitalized, Capital Amount $ 1,661,955   $ 1,662,128          
Required to be considered well capitalized, Ratio (as a percent) 6.50%   6.50%          
Tier I capital to risk-weighted assets                
Actual, Capital Amount $ 3,102,963   $ 3,010,174          
Actual, Ratio (as a percent) 12.14   11.77          
Minimum capital required, Capital Amount $ 2,173,326   $ 2,173,552          
Minimum capital required, Ratio (as a percent) 8.50   8.50          
Required to be considered well capitalized, Capital Amount $ 2,045,483   $ 2,045,696          
Required to be considered well capitalized, Ratio (as a percent) 8.00   8.00          
Total capital to risk-weighted assets                
Actual, Capital Amount $ 3,609,452   $ 3,642,039          
Actual, Ratio (as a percent) 14.12   14.24          
Minimum capital required, Capital Amount $ 2,684,696   $ 2,684,976          
Minimum capital required, Ratio (as a percent) 10.50   10.50          
Required to be considered well capitalized, Capital Amount $ 2,556,854   $ 2,557,120          
Required to be considered well capitalized, Ratio (as a percent) 10.00   10.00          
Tier I capital to average assets (leverage ratio)                
Actual, Capital Amount $ 3,102,963   $ 3,010,174          
Actual, Ratio (as a percent) 8.13   8.27          
Minimum capital required, Capital Amount $ 1,526,815   $ 1,455,135          
Minimum capital required, Ratio (as a percent) 4.00   4.00          
Required to be considered well capitalized, Capital Amount $ 1,908,518   $ 1,818,919          
Required to be considered well capitalized, Ratio (as a percent) 5.00   5.00          
ASU 2016-13                
Capital ratios                
Additional allowance for credit losses for loans [1]           $ 54,438    
Deferred tax assets [2]           12,639    
Additional reserve for unfunded commitments           6,400    
Retained earnings [3]           (44,820)    
ASU 2016-13 | Cumulative Effect of Adoption of ASU                
Capital ratios                
Retained earnings           $ (44,800)    
Subordinated Debt                
Capital ratios                
Original Principal amount $ 25,000              
Trust Preferred Securities                
Capital ratios                
Original Principal amount 38,500              
South State Bank (the Bank)                
Common equity Tier 1 to risk-weighted assets                
Actual, Capital Amount $ 3,308,073   $ 3,157,098          
Actual, Ratio (as a percent) 12.98%   12.39%          
Minimum capital required, Capital Amount $ 1,784,618   $ 1,784,120          
Minimum capital required, Ratio (as a percent) 7.00%   7.00%          
Required to be considered well capitalized, Capital Amount $ 1,657,145   $ 1,656,683          
Required to be considered well capitalized, Ratio (as a percent) 6.50%   6.50%          
Tier I capital to risk-weighted assets                
Actual, Capital Amount $ 3,308,073   $ 3,157,098          
Actual, Ratio (as a percent) 12.98   12.39          
Minimum capital required, Capital Amount $ 2,167,036   $ 2,166,432          
Minimum capital required, Ratio (as a percent) 8.50   8.50          
Required to be considered well capitalized, Capital Amount $ 2,039,563   $ 2,038,994          
Required to be considered well capitalized, Ratio (as a percent) 8.00   8.00          
Total capital to risk-weighted assets                
Actual, Capital Amount $ 3,486,562   $ 3,397,463          
Actual, Ratio (as a percent) 13.68   13.33          
Minimum capital required, Capital Amount $ 2,676,927   $ 2,676,180          
Minimum capital required, Ratio (as a percent) 10.50   10.50          
Required to be considered well capitalized, Capital Amount $ 2,549,454   $ 2,548,743          
Required to be considered well capitalized, Ratio (as a percent) 10.00   10.00          
Tier I capital to average assets (leverage ratio)                
Actual, Capital Amount $ 3,308,073   $ 3,157,098          
Actual, Ratio (as a percent) 8.69   8.71          
Minimum capital required, Capital Amount $ 1,522,405   $ 1,450,600          
Minimum capital required, Ratio (as a percent) 4.00   4.00          
Required to be considered well capitalized, Capital Amount $ 1,903,006   $ 1,813,250          
Required to be considered well capitalized, Ratio (as a percent) 5.00   5.00          
Minimum                
Common equity Tier 1 to risk-weighted assets                
Actual, Ratio (as a percent) 4.50%              
Tier I capital to risk-weighted assets                
Actual, Ratio (as a percent) 6              
Total capital to risk-weighted assets                
Actual, Ratio (as a percent) 4              
Tier I capital to average assets (leverage ratio)                
Actual, Ratio (as a percent) 8              
[1] This is the calculated adjustment to the ACL related to the adoption of ASC 326. Additional reserve related to non-acquired loans was $34,049, to acquired loans was $16,981 and to purchased credit deteriorated loans was $3,408.
[2] This is the effect of deferred tax assets related to the adjustment to the ACL from the adoption of ASC 326 using a 22% tax rate.
[3] This is the net adjustment to retained earnings related to the adoption of ASC 326.