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Retirement Plans - Expenses Incurred And Charged Against Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]
Employee savings plan/ 401(k)	$ 15,357	$ 14,991	$ 10,962
Supplemental executive retirement plan	(1,510)	3,475	2,862
Post-retirement benefits	(108)	67	43
Non-contributory defined benefit pension plan
Defined Benefit Plan Disclosure [Line Items]
Expenses incurred and charged against operations	$ 13,739	$ 18,533	$ 13,867

X

- Definition

Represents the total amount of net periodic benefit cost related to post retirement benefits, for 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

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

+ Details

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Balance Type:	debit
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- Definition

Amount of cost (reversal of cost) for other postretirement benefits. Excludes pension benefits.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of cost (reversal of cost) for pension and other postretirement benefits.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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- Details

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Balance Type:
Period Type: