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v3.25.3

Summary of Significant Accounting Policies - Loans (Details) $ in Millions | Sep. 30, 2025 USD ($)
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Summary of Significant Accounting Policies |
Net book balance | $ 1
Net book balance, purchased credit deteriorated loans | $ 1

X
- Definition Represents the net book balance for non-accrual loan to be individually evaluated for loss. + References No definition available. + Details
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Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the net book balance for purchased credit deteriorated loans to be individually evaluated for loss. + References No definition available. + Details
Name: | ssb_NetBookBalanceForPurchasedCreditDeterioratedLoansToBeEvaluatedIndividuallyForLoss
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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