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Deposits - Certificates of deposits and Scheduled maturities of time deposits (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Deposits
Aggregate amounts of certificates of deposits in denominations of $250,000 or more	$ 764,700	$ 814,200
Traditional, out-of-market brokered deposits	475,000	600,000
Other Time Deposits	$ 3,479,727	$ 3,748,605

X

- Definition

The aggregate amount of certificates of deposits liabilities in denominations of $250,000 or more.

+ References

No definition available.

+ Details

Name:	ssb_CertificatesOfDeposit250000OrMore
Namespace Prefix:	ssb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	ssb_DepositsDisclosureAbstract
Namespace Prefix:	ssb_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Represents the amount of other time deposits, not otherwise specified in the taxonomy, that cannot be withdrawn before a set date without penalty or for which notice of withdrawal is required.

+ References

No definition available.

+ Details

Name:	ssb_OtherTimeDeposits
Namespace Prefix:	ssb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of interest-bearing domestic third-party deposits placed by or through the assistance of a deposit broker, also known as brokered deposit liabilities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.12)
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

+ Details

Name:	us-gaap_InterestBearingDomesticDepositBrokered
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant