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Fair Value - Mortgage Loans Held for Sale (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Fair Value. |  |  |  |  |
Fair value | $ 27,443 |  | $ 27,443 |  | $ 28,968
Unpaid principal balance | (26,921) |  | (26,921) |  | (27,937)
Fair value less aggregated unpaid principal balance | 522 |  | 522 |  | $ 1,031
Change in fair value of mortgage loans held for sale | $ (574) | $ (2,149) | $ (508) | $ (7,604) |

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- Definition Fair value portion of mortgage loans held-for-sale after deducting unpaid principal balance. + References No definition available. + Details
Name: | ssb_LoanMortgageHeldForSaleFairValueAfterUnpaidPrincipalBalance
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Unpaid principal balance of mortgage loans held-for-sale. + References No definition available. + Details
Name: | ssb_LoanMortgageHeldForSaleUnpaidPrincipalBalance
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_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The increase (decrease) during the reporting period in the value of mortgage loans that are held with the intention to sell or be securitized in the near future. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-28 + Details
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Period Type: | duration

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- Definition Fair value portion of mortgage loans held-for-sale. + References No definition available. + Details
Name: | us-gaap_MortgagesHeldForSaleFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant