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Commitments and Contingent Liabilities (Details) $ in Millions | Sep. 30, 2021 USD ($)
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Commitments and Contingent Liabilities |
Commitments to extend credit and standby letters of credit | $ 7,000.0
Liability Recorded for Expected Credit Losses on Unfunded Commitments | $ 28.3

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- Definition The total amount outstanding of the commitments to extend credit and standby letters of credit as of the reporting date. + References No definition available. + Details
Name: | ssb_CommitmentsToExtendCreditAndStandbyLettersOfCredit
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of liability recorded for expected credit losses on unfunded commitments. + References No definition available. + Details
Name: | ssb_LiabilityRecordedForExpectedCreditLossesOnUnfundedCommitments
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_CommitmentsAndContingenciesDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration