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Fair Value - Loans (Details)	12 Months Ended
	Dec. 31, 2021
Fair Value.
Percentage of individually evaluated loans	55.00%

X

- Definition

Represents the percentage of loans evaluated based on fair value of collateral security.

+ References

No definition available.

+ Details

Name:	ssb_PercentageOfEvaluatedLoansBasedOnFairValueOfCollateralSecurity
Namespace Prefix:	ssb_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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