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Small Business Administration ("SBA") Loans Held for Sale (Details) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2025 USD ($) | Sep. 30, 2025 USD ($)
Small Business Administration ("SBA") Loans Held for Sale |  |
Purchase of guaranteed portions of SBA loans | $ 217,000 | $ 903,500
Guaranteed portions of SBA loans pooled into securities | 139,700 | 646,800
Securities sold in the secondary market | 159,600 | 640,800
Sale of individual loans | 32,300 | 91,100
Guaranteed portion of SBA loans for sale | 278,300 | 278,300
Guaranteed portions of SBA loans sold | 8,600 | 51,200
Gain on sale of guaranteed portions of SBA loans | $ 758 | $ 4,500

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

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- References No definition available. + Details
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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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