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Summary of Significant Accounting Policies - Leases (Details) $ in Millions	Mar. 31, 2023 USD ($)
Summary of Significant Accounting Policies
Financing Receivable , Individually Evaluated for Losses ,Net Book Balance	$ 1

X

- Definition

The threshold amount of net book balance of financing receivable individually evaluated for losses.

+ References

No definition available.

+ Details

Name:	ssb_FinancingReceivableIndividuallyEvaluatedForLossesThresholdNetBookBalance
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