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Small Business Administration ("SBA") Loans Held for Sale (Details) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2025 USD ($)	Sep. 30, 2025 USD ($)
Small Business Administration ("SBA") Loans Held for Sale
Purchase of guaranteed portions of SBA loans	$ 217,000	$ 903,500
Guaranteed portions of SBA loans pooled into securities	139,700	646,800
Securities sold in the secondary market	159,600	640,800
Sale of individual loans	32,300	91,100
Guaranteed portion of SBA loans for sale	278,300	278,300
Guaranteed portions of SBA loans sold	8,600	51,200
Gain on sale of guaranteed portions of SBA loans	$ 758	$ 4,500

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

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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

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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

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Namespace Prefix:	ssb_
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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

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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

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Namespace Prefix:	ssb_
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Balance Type:	debit
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X

- Definition

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

+ References

No definition available.

+ Details

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

No definition available.

+ Details

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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

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