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Deposits - Certificates of deposits and Scheduled maturities of time deposits (Details) - USD ($) $ in Billions | Sep. 30, 2025 | Dec. 31, 2024
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Deposits |  |
Aggregate amounts of certificates of deposits in denominations of $250,000 or more | $ 1.9 | $ 1.1

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- Definition The aggregate amount of certificates of deposits liabilities in denominations of $250,000 or more. + References No definition available. + Details
Name: | ssb_CertificatesOfDeposit250000OrMore
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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