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Securities - Net gains (losses) on trading securities (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Securities |  |  |
Net (losses) gains on sales transaction | $ 289 | $ (1,326) | $ 1,326
Net mark to mark gains (losses) | 278 | (237) | (273)
Net gains (losses) on trading securities | $ 567 | $ (1,563) | $ 1,053

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- Definition Amount of gain losses on mark to market debt securities trading. + References No definition available. + Details
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Period Type: | duration

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- Definition Amount of gain losses on sale of debt securities trading. + 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
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- Definition Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 14 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-14 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(7)(c)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 + Details
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