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Restrictions on Subsidiary Dividends, Loans, or Advances (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Maximum amount available for transfer in the form of loans or advances	$ 616.1	$ 579.8
Outstanding loans or advances	0.0	$ 0.0
Announced stock repurchase program
Amount available for special dividend distribution without approval from SCBFI	168.0
Special dividend for general operating liquidity	$ 161.6

X

- Definition

Represents the maximum amount available in the form of loans or advances under regulatory requirements.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of outstanding loans and advances relating to insider loans.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of dividends available for payment after computation of statutory restrictions on capital surplus.

+ References

No definition available.

+ Details

Name:	us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPayments
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of dividends that can be declared or paid without approval of regulatory agency.

+ References

No definition available.

+ Details

Name:	us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Details

Name:	srt_ShareRepurchaseProgramAxis=ssb_AnnouncedStockRepurchaseProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: