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Financial Instruments with Off-Balance Sheet Risk (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
Standby letters of credit |  |
Financial instruments, whose contract amounts represent credit risk |  |
Expiration period of standby letters of credit | 1 year |
South State Bank (the Bank) |  |
Financial instruments, whose contract amounts represent credit risk |  |
Off balance sheet financial instruments | $ 2,934,869 | $ 2,781,626
South State Bank (the Bank) | Commitments to extend credit |  |
Financial instruments, whose contract amounts represent credit risk |  |
Off balance sheet financial instruments | 2,902,000 | 2,748,901
South State Bank (the Bank) | Standby letters of credit and financial guarantees |  |
Financial instruments, whose contract amounts represent credit risk |  |
Off balance sheet financial instruments | $ 32,869 | $ 32,725

X
- Definition Represents the term of borrowing under standby letters of credit. + References No definition available. + Details
Name: | ssb_MaximumTermOfStandbyLettersOfCredit
Namespace Prefix: | ssb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of contractual obligation, including but not limited to, long-term debt, capital lease obligations, operating lease obligations, purchase obligations, and other commitments. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- 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

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

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_SubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommitmentsToExtendCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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