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Loan Servicing, Mortgage Origination, and Loans Held for Sale - Mandatory cash forwards (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Mortgage loan securitizations, mandatory cash forwards, and whole loan sales |  |
Loan sales | $ 812,300 | $ 645,700
Loan securitizations and loan sales | $ 660,600 | $ 498,700
Percentage of loan securitizations and loan sales | 81.30% | 77.20%
Loans held for sale | $ 59,363 | $ 22,925
Residential mortgage loans awaiting sale in secondary market | Minimum |  |
Mortgage loan securitizations, mandatory cash forwards, and whole loan sales |  |
Loans held for sale, settlement period | 15 days |
Residential mortgage loans awaiting sale in secondary market | Maximum |  |
Mortgage loan securitizations, mandatory cash forwards, and whole loan sales |  |
Loans held for sale, settlement period | 45 days |

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- Definition Represent the settlement period of loan held for sale. + References No definition available. + Details
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Namespace Prefix: | ssb_
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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Namespace Prefix: | ssb_
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

X
- 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

X
- 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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Namespace Prefix: | ssb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after allowance for bad debt, of loan receivables held-for-sale that are not part of a disposal group. Excludes loans and leases covered under loss sharing agreements and loans classified as debt securities. + 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=118952595&loc=d3e4428-111522 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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