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v3.23.2

Commitments and Contingent Liabilities (Details) - USD ($) $ in Millions | 3 Months Ended | 24 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Dec. 31, 2024 | Jun. 30, 2023
Commitments to extend credit and standby letters of credit |  |  | $ 11,100.0
Liability recorded for expected credit losses on unfunded commitments |  |  | $ 63.4
Forecast |  |  |
FDIC quarterly special assessment | $ 2.8 |  |
Total FDIC special assessment |  | $ 22.7 |

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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 Amount of quarterly expense for Federal Deposit Insurance Corporation (FDIC) special assessment. + References No definition available. + Details
Name: | ssb_FederalDepositInsuranceCorporationQuarterlySpecialAssessmentExpense
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

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- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |