Name:	ssb_GainLossOnSaleOfSmallBusinessAdministrationLoansHeldForSale
Namespace Prefix:	ssb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The cash outflow used to purchase guaranteed portions of SBA loans that are held with the intention to resell in the near future.

No definition available.

Name:	ssb_PaymentForPurchaseGuaranteedPortionOfLoanSmallBusinessAdministrationHeldForSale
Namespace Prefix:	ssb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

The non-cash amount of Small Business Administration loan held for sale pooled during the period.

No definition available.

Name:	ssb_PoolingOfSmallBusinessAdministrationLoansHeldForSale
Namespace Prefix:	ssb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The cash inflow resulting from the sale of guaranteed portions small business administration loans that are held with the intention to resell in the near future.

No definition available.

Name:	ssb_ProceedsFromSaleGuaranteedPortionOfLoanSmallBusinessAdministrationHeldForSale
Namespace Prefix:	ssb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The cash inflow associated with sale of individual SBA loans during the period.

No definition available.

Name:	ssb_ProceedsFromSaleOfIndividualSmallBusinessAdministrationLoans
Namespace Prefix:	ssb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

The cash inflow associated with sale of individual SBA loans into the secondary market.

No definition available.

Name:	ssb_ProceedsFromSaleOfSmallBusinessAdministrationLoansSecondaryMarket
Namespace Prefix:	ssb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- References

No definition available.

Name:	ssb_SmallBusinessAdministrationLoansHeldForSaleDisclosuresAbstract
Namespace Prefix:	ssb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Amount, before valuation allowance, of financing receivable classified as held-for-sale.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 948
-SubTopic 310
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477011/948-310-45-1