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Deposits - Certificates of deposits and Scheduled maturities of time deposits (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Deposits
Aggregate amounts of certificates of deposits in denominations of $250,000 or more	$ 1,000.0	$ 927.2

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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