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v3.21.1

Loans - Changes in Status of Loans (Details) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 USD ($) loan
Loans Designated as TDRs |
Paying under restructured terms - Number of Loans | loan | 18
Paying under restructured terms - Amortized Cost | $ | $ 8,829
Interest rate modification |
Loans Designated as TDRs |
Paying under restructured terms - Number of Loans | loan | 10
Paying under restructured terms - Amortized Cost | $ | $ 7,620
Term modification |
Loans Designated as TDRs |
Paying under restructured terms - Number of Loans | loan | 8
Paying under restructured terms - Amortized Cost | $ | $ 1,209

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

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- Definition Amount, after troubled debt restructuring, of modified financing receivable under restructured terms. + References No definition available. + Details
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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