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Small Business Administration ("SBA") Loans Held for Sale (Details) - USD ($) $ in Millions | 3 Months Ended |
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Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025
Small Business Administration ("SBA") Loans Held for Sale |  |  |
Purchase of guaranteed portions of SBA loans | $ 346.7 | $ 450.9 |
Guaranteed portions of SBA loans pooled into securities | 285.8 | 312.9 |
Securities sold in the secondary market | 294.2 | 321.0 |
Sale of individual loans | 34.6 | 15.4 |
Guaranteed portion of SBA loans for sale | 279.8 |  | $ 283.9
Guaranteed portions of SBA loans sold | 8.3 | 22.6 |
Gain on sale of guaranteed portions of SBA loans | $ 748,000.0 | $ 2.0 |

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- Definition The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of Small Business Administration loans made to finance real estate acquisitions. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The cash outflow used to purchase guaranteed portions of SBA loans that are held with the intention to resell in the near future. + References No definition available. + Details
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Namespace Prefix: | ssb_
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Balance Type: | credit
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- Definition The non-cash amount of Small Business Administration loan held for sale pooled during the period. + References No definition available. + Details
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Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The cash inflow resulting from the sale of guaranteed portions small business administration loans that are held with the intention to resell in the near future. + References No definition available. + Details
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Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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- Definition The cash inflow associated with sale of individual SBA loans during the period. + References No definition available. + Details
Name: | ssb_ProceedsFromSaleOfIndividualSmallBusinessAdministrationLoans
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The cash inflow associated with sale of individual SBA loans into the secondary market. + References No definition available. + Details
Name: | ssb_ProceedsFromSaleOfSmallBusinessAdministrationLoansSecondaryMarket
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | ssb_SmallBusinessAdministrationLoansHeldForSaleDisclosuresAbstract
Namespace Prefix: | ssb_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount, before valuation allowance, of financing receivable classified as held-for-sale. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 948 -SubTopic 310 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147477011/948-310-45-1 + Details
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