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Loans - Changes in Status of Loans (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) loan
Loans Designated as TDRs |
Paying under restructured terms - Number of Loans | loan | 4
Paying under restructured terms - Amortized Cost | $ | $ 831
Converted to Nonaccrual - Number of Loans | loan | 1
Converted to Nonaccrual - Amortized Cost | $ | $ 38
Interest rate modification |
Loans Designated as TDRs |
Paying under restructured terms - Number of Loans | loan | 3
Paying under restructured terms - Amortized Cost | $ | $ 515
Term modification |
Loans Designated as TDRs |
Paying under restructured terms - Number of Loans | loan | 1
Paying under restructured terms - Amortized Cost | $ | $ 316
Converted to Nonaccrual - Number of Loans | loan | 1
Converted to Nonaccrual - Amortized Cost | $ | $ 38

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings and converted to nonaccrual. + References No definition available. + Details
Name: | ssb_FinancingReceivableModificationsNumberOfContractsConvertedToNonaccrual
Namespace Prefix: | ssb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings and paying under restructured terms. + References No definition available. + Details
Name: | ssb_FinancingReceivableModificationsNumberOfContractsUnderRestructuredTerms
Namespace Prefix: | ssb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after troubled debt restructuring, of modified financing receivable under restructured terms. + References No definition available. + Details
Name: | ssb_FinancingReceivableTroubledDebtRestructuringPostModificationAmortizedCostUnderRestructuredTerms
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount, after troubled debt restructuring, of modified financing receivable converted to nonaccrual. + References No definition available. + Details
Name: | ssb_FinancingReceivableTroubledDebtRestructuringPostmodificationAmortizedCostConvertedToNonaccrual
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- 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
Name: | us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_ContractualInterestRateReductionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |