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Summary of Significant Accounting Policies - Loans (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Summary of Significant Accounting Policies |  |
Net book balance | $ 1 | $ 1

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- 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

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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