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Small Business Administration ("SBA") Loans Held for Sale (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2025
Small Business Administration ("SBA") Loans Held for Sale
Purchase of guaranteed portions of SBA loans	$ 346.7	$ 450.9
Guaranteed portions of SBA loans pooled into securities	285.8	312.9
Securities sold in the secondary market	294.2	321.0
Sale of individual loans	34.6	15.4
Guaranteed portion of SBA loans for sale	279.8		$ 283.9
Guaranteed portions of SBA loans sold	8.3	22.6
Gain on sale of guaranteed portions of SBA loans	$ 748,000.0	$ 2.0

X

- Definition

The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of Small Business Administration loans made to finance real estate acquisitions.

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

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.

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- Definition

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

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

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

+ References

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

+ Details

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Balance Type:	debit
Period Type:	instant