XML 68 R55.htm IDEA: XBRL DOCUMENT
v3.22.2.2

Investment Securities - Securities with gross unrealized losses (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | $ 157,205 | $ 31,633
Twelve Months or More | 282,502 | 10,522
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 1,104,782 | 1,316,106
Twelve Months or More | 1,145,017 | 307,277
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 488,272 | 46,537
Twelve Months or More | 465,150 | 17,261
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 3,244,460 | 2,935,314
Twelve Months or More | 1,953,903 | 462,192
U.S. Treasuries |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 7,358 |
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 264,425 |
U.S. Government agencies |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 10,903 | 1,745
Twelve Months or More | 19,188 | 882
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 98,443 | 86,168
Twelve Months or More | 68,727 | 24,118
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 12,248 | 529
Twelve Months or More | 15,072 | 1,236
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 159,395 | 73,353
Twelve Months or More | 59,228 | 23,763
Residential mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 90,161 | 18,768
Twelve Months or More | 177,344 | 5,510
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 627,193 | 868,327
Twelve Months or More | 738,063 | 184,819
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 122,435 | 17,381
Twelve Months or More | 196,035 | 8,604
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 874,957 | 1,274,934
Twelve Months or More | 854,926 | 221,435
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 34,942 | 4,937
Twelve Months or More | 29,660 |
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 265,792 | 169,240
Twelve Months or More | 104,370 |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 35,684 | 10,911
Twelve Months or More | 66,222 |
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 368,713 | 432,300
Twelve Months or More | 257,017 |
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 21,199 | 4,902
Twelve Months or More | 45,167 | 3,119
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 113,354 | 154,963
Twelve Months or More | 186,507 | 75,450
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 66,849 | 13,120
Twelve Months or More | 132,795 | 5,310
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 463,425 | 846,581
Twelve Months or More | 528,853 | 98,106
State and municipal obligations |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 223,328 | 1,867
Twelve Months or More | 29,422 | 352
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 917,487 | 123,987
Twelve Months or More | 75,275 | 8,579
Small Business Administration loan-backed securities |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months |  | 1,281
Twelve Months or More | 11,143 | 1,011
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months |  | 37,408
Twelve Months or More | 47,350 | 22,890
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 18,118 | 2,720
Twelve Months or More | 25,604 | 1,759
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 167,715 | 179,168
Twelve Months or More | 178,604 | 110,309
Corporate securities. |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 2,252 | 9
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | $ 28,343 | $ 4,991

X
- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for 12 months or longer. + References No definition available. + Details
Name: | ssb_DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPosition12MonthsOrLongerFairValueDisclosure
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity), in continuous loss position for 12 months or longer. + References No definition available. + Details
Name: | ssb_DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPosition12MonthsOrLongerGrossUnrealizedLoss
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | ssb_DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositionFairValueDisclosureAbstract
Namespace Prefix: | ssb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity), in continuous unrealized loss position for less than 12 months. + References No definition available. + Details
Name: | ssb_DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositionLessThan12MonthsFairValueDisclosure
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References No definition available. + Details
Name: | ssb_DebtSecuritiesHeldToMaturityContinuousUnrealizedLossPositionLessThan12MonthsGrossUnrealizedLoss
Namespace Prefix: | ssb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | ssb_DebtSecuritiesHeldToMaturityUnrealizedLossPositionAccumulatedLossesAbstract
Namespace Prefix: | ssb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionAccumulatedLossAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValueAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI https://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27337-111563 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesIssuedByUSGovernmentSponsoredEnterprisesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CommercialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=ssb_SmallBusinessAdministrationLoanBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |