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Securities - Net gains (losses) on trading securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Securities
Net gains (losses) on sales transaction	$ 54	$ (139)
Net mark to mark gains (losses)	12	(6)
Net gains (losses) on trading securities	$ 66	$ (145)

X

- Definition

Amount of gain losses on mark to market debt securities trading.

+ References

No definition available.

+ Details

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X

- Definition

Amount of gain losses on sale of debt securities trading.

+ References

No definition available.

+ Details

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Namespace Prefix:	ssb_
Data Type:	xbrli:monetaryItemType
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X

- References

No definition available.

+ Details

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X

- Definition

Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 14
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481800/320-10-50-14

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03(7)(c))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

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