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Commitments and Contingent Liabilities (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2024 | Sep. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Commitments and Contingent Liabilities |  |  |  |
Commitments to extend credit and standby letters of credit |  | $ 9,000.0 |  |
Liability recorded for expected credit losses on unfunded commitments |  | 41.5 |  |
FDIC base annual rate | 13.40% |  |  |
Amount of uninsured deposits adjusted to exclude over assessment periods |  |  | $ 25.7 | $ 5,000.0
Period for special assessment |  |  | 2 years |
FDIC special assessment additional expense |  | 4.5 |  |
FDIC special assessment |  | $ 30.2 |  |

X
- Definition Amount of uninsured deposits adjusted to exclude over assessment periods. + References No definition available. + Details
Name: | ssb_AmountOfUninsuredDepositsAdjustedToExclude
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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

X
- Definition Amount of additional expense for Federal Deposit Insurance Corporation (FDIC) special assessment. + References No definition available. + Details
Name: | ssb_FederalDepositInsuranceCorporationSpecialAssessmentAdditionalExpense
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expense for Federal Deposit Insurance Corporation (FDIC) special assessment. + References No definition available. + Details
Name: | ssb_FederalDepositInsuranceCorporationSpecialAssessmentExpense
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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

X
- Definition Period for special assessment. + References No definition available. + Details
Name: | ssb_SpecialAssessmentPeriod
Namespace Prefix: | ssb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of base annual rate of uninsured deposits. + References No definition available. + Details
Name: | ssb_UninsuredDepositsBaseAnnualRate
Namespace Prefix: | ssb_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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