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Mortgage Loan Servicing, Origination, and Loans Held for Sale - Mandatory cash forwards (Details) - USD ($)	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Mortgage loan securitizations, mandatory cash forwards, and whole loan sales
Loan sales	$ 1,100,000,000	$ 859,900,000
Loan securitizations and loan sales	$ 776,700,000	$ 679,800,000
Percentage of loan securitizations and loan sales	72.60%	79.10%
Repurchase of principal balance	$ 1,900,000	$ 1,600,000
Loss reimbursement and settlement claims paid	28,000	8,000
Loans held for sale	279,426,000	50,888,000
Residential mortgage loans
Mortgage loan securitizations, mandatory cash forwards, and whole loan sales
Loans held for sale	$ 98,100,000	$ 50,900,000
Residential mortgage loans awaiting sale in secondary market | Minimum
Mortgage loan securitizations, mandatory cash forwards, and whole loan sales
Loans held for sale, settlement period	15 days
Residential mortgage loans awaiting sale in secondary market | Maximum
Mortgage loan securitizations, mandatory cash forwards, and whole loan sales
Loans held for sale, settlement period	45 days

X

- Definition

The amount of cash paid for the loss reimbursement and settlement.

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Represent the settlement period of loan held for sale.

+ References

No definition available.

+ Details

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- Definition

Represents the loans repurchased.

+ References

No definition available.

+ Details

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X

- Definition

Represents the amount of mortgage loan securitized and sold during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	ssb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- References

No definition available.

+ Details

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X

- Definition

Represents the amount of mortgage loan sold during the period.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the percentage of mortgage loan securitized and sold during the period with servicing rights retained by the company.

+ References

No definition available.

+ Details

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

X

- Definition

Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security.

+ 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
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- Details

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