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Other Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other Expense |  |  |
Business development and staff related | $ 25,055 | $ 19,015 | $ 14,571
Bankcard expense | 2,789 | 3,576 | 3,459
Other loan expense | 7,838 | 8,646 | 7,562
Director and shareholder expense | 4,753 | 4,382 | 5,486
Armored carrier and courier expense | 2,366 | 2,650 | 3,081
Property and sales tax | 4,173 | 4,037 | 3,487
Bank service charge expense | 3,002 | 2,472 | 2,147
Fraud and operational charge-off expense | 4,965 | 11,202 | 4,727
Low income housing tax credit partnership amortization | 9,629 | 9,722 | 9,986
Donations | 3,975 | 4,112 | 2,563
Deposit earnings credit expense | 14,619 | 4,507 | 2,809
Correspondent bank service and processing expense | 5,663 | 1,229 | 1,344
Other | 9,392 | 8,910 | 6,129
Total other noninterest expense | $ 98,219 | $ 84,460 | $ 67,351

X
- Definition Represents the amount of armored carrier and courier expenses. + References No definition available. + Details
Name: | ssb_ArmoredCarrierAndCourierExpense
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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X
- Definition Amount of bank service charge expenses. + References No definition available. + Details
Name: | ssb_BankServiceChargeExpenses
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of Bankcard expense recognized during the period. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of expense in the period for business development and staff related. + References No definition available. + Details
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- Definition Amount of bank service and processing expenses. + References No definition available. + Details
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X
- Definition Amount of deposit earnings credit expense. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Amount of expense associated with amount of expense associated with postage. + References No definition available. + Details
Name: | ssb_DirectorAndShareholderExpense
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of donation. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of fraud and operational charge-off expense. + References No definition available. + Details
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Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of expenses related to low income housing tax credit partnership amortization. + References No definition available. + Details
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- Definition Represents the amount of other expense in the period. + References No definition available. + Details
Name: | ssb_OtherExpense
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of expense in the period for other loan. + References No definition available. + Details
Name: | ssb_OtherLoanExpense
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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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Definition Amount of noninterest expense classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 + Details
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- Definition Amount of tax expense classified as other. + References No definition available. + Details
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