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Trading Securities (Details) - USD ($)		12 Months Ended
	Jul. 07, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Trading Securities
Purchases	$ 201,095,000	$ (201,095,000)
Proceeds from sale	190,907,000	(190,907,000)
Net realized gain	338,000	$ 50,000	$ 2,711,000	$ (655,000)
Net unrealized gains	148,000
Ending balance	$ 10,674,000

X

- Definition

The amount of debt securities available for sale realized loss on exclusion of certain shares.

+ References

No definition available.

+ Details

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X

- Definition

The amount of debt securities net unrealized gains

+ References

No definition available.

+ Details

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Namespace Prefix:	ssb_
Data Type:	xbrli:monetaryItemType
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X

- Definition

Represents the amount of cash outflow for purchases of trading securities.

+ References

No definition available.

+ Details

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Namespace Prefix:	ssb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of unrealized and 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/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27476-111563

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X

- Definition

Amount of 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/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121553693&loc=d3e26610-111562

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