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Related Party Transactions (Details) - South State Bank (the Bank) - Directors and executive officers, their immediate families and their business interests - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Related Party Transactions    
Loans outstanding $ 37.5 $ 23.5
Additional loans made 32.5  
Repayments received 18.5  
Related party deposits $ 21.8 $ 17.7