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Loan Servicing, Mortgage Origination, and Loans Held for Sale - Mandatory cash forwards (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020
Mortgage loan securitizations, mandatory cash forwards, and whole loan sales |  |  |
Loan sales | $ 774,400 | $ 228,300 |
Loan securitizations and loan sales | $ 621,700 | $ 194,500 |
Percentage of loan securitizations and loan sales | 80.30% | 85.20% |
Loans held for sale | $ 352,997 |  | $ 290,467
Minimum |  |  |
Mortgage loan securitizations, mandatory cash forwards, and whole loan sales |  |  |
Loans held for sale, settlement period | 15 days |  |
Maximum |  |  |
Mortgage loan securitizations, mandatory cash forwards, and whole loan sales |  |  |
Loans held for sale, settlement period | 45 days |  |

X
- Definition Represent the settlement period of loan held for sale. + References No definition available. + Details
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Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of mortgage loan securitized and sold during the period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
Name: | ssb_MortgageLoanSecuritizationsAndSalesAbstract
Namespace Prefix: | ssb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the amount of mortgage loan sold during the period. + References No definition available. + Details
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Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Represents the percentage of mortgage loan securitized and sold during the period with servicing rights retained by the company. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
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X
- Definition Amount, after valuation allowance, of financing receivable held for sale and not part of disposal group. Excludes loan covered under loss sharing agreement and loan classified as investment in debt security. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=120238483&loc=d3e48678-111004 + Details
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Balance Type: | debit
Period Type: | instant

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- Details
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Period Type: |

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- Details
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