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Summary of Significant Accounting Policies - Leases (Details) $ in Millions | Sep. 30, 2023 USD ($)
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Summary of Significant Accounting Policies |
Financing Receivable , Individually Evaluated for Losses ,Net Book Balance | $ 1

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- Definition The threshold amount of net book balance of financing receivable individually evaluated for losses. + References No definition available. + Details
Name: | ssb_FinancingReceivableIndividuallyEvaluatedForLossesThresholdNetBookBalance
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration