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Mergers and Acquisitions - Atlantic Capital (Details)	May 20, 2024
Atlantic Capital
Mergers and Acquisitions
Shares of the common stock in exchange for each share	0.6

X

- Definition

Represents the fixed exchange ratio per share of acquirer's shares to be received in exchange for shares of acquiree entity.

+ References

No definition available.

+ Details

Name:	ssb_BusinessAcquisitionEquityInterestsIssuedOrIssuableNumberOfSharesIssuedExchangeRatio
Namespace Prefix:	ssb_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-5

+ Details

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

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=ssb_AtlanticCapitalBancsharesIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: