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Commitments and Contingent Liabilities (Details) $ in Millions	Jun. 30, 2021 USD ($)
Commitments and Contingent Liabilities
Commitments to extend credit and standby letters of credit	$ 6,700.0
Liability Recorded for Expected Credit Losses on Unfunded Commitments	$ 31.0

X

- Definition

The total amount outstanding of the commitments to extend credit and standby letters of credit as of the reporting date.

+ References

No definition available.

+ Details

Name:	ssb_CommitmentsToExtendCreditAndStandbyLettersOfCredit
Namespace Prefix:	ssb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of liability recorded for expected credit losses on unfunded commitments.

+ References

No definition available.

+ Details

Name:	ssb_LiabilityRecordedForExpectedCreditLossesOnUnfundedCommitments
Namespace Prefix:	ssb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration