XML 71 R56.htm IDEA: XBRL DOCUMENT
v3.23.2

Investment Securities - Securities with gross unrealized losses (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | $ 1,549 | $ 115,297
Twelve Months or More | 439,092 | 317,776
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 44,665 | 952,682
Twelve Months or More | 2,099,849 | 1,297,486
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 15,220 | 197,789
Twelve Months or More | 866,182 | 695,584
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 310,283 | 2,082,068
Twelve Months or More | 4,608,799 | 3,073,871
U.S. Treasuries |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months |  | 6,778
Twelve Months or More | 3,745 |
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months |  | 265,638
Twelve Months or More | 219,913 |
U.S. Government agencies |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months |  | 5,514
Twelve Months or More | 29,352 | 24,273
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months |  | 78,833
Twelve Months or More | 167,913 | 88,642
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 560 | 8,193
Twelve Months or More | 27,126 | 18,691
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 24,440 | 138,807
Twelve Months or More | 193,905 | 80,281
Residential mortgage pass-through securities issued or guaranteed by U.S. government agencies or sponsored enterprises |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months |  | 65,181
Twelve Months or More | 253,666 | 189,912
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months |  | 513,086
Twelve Months or More | 1,260,806 | 823,467
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 1,252 | 42,767
Twelve Months or More | 297,850 | 255,285
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 29,385 | 459,773
Twelve Months or More | 1,574,985 | 1,238,580
Residential collateralized mortgage-obligations issued by U.S. government agencies or sponsored enterprises |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months | 1,549 | 30,284
Twelve Months or More | 70,608 | 39,380
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months | 44,665 | 277,868
Twelve Months or More | 343,752 | 127,128
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 3,230 | 21,450
Twelve Months or More | 103,192 | 85,842
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 53,808 | 274,082
Twelve Months or More | 505,968 | 326,963
Commercial mortgage-backed securities issued by U.S. government agencies or sponsored enterprises |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Less Than Twelve Months |  | 14,318
Twelve Months or More | 73,410 | 51,986
Securities Held to Maturity, Fair Value |  |
Less Than Twelve Months |  | 82,895
Twelve Months or More | 284,405 | 213,387
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 7,479 | 17,156
Twelve Months or More | 203,933 | 181,688
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 71,072 | 206,228
Twelve Months or More | 891,422 | 767,002
State and municipal obligations |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 1,400 | 97,084
Twelve Months or More | 179,337 | 108,799
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 32,141 | 616,631
Twelve Months or More | 919,535 | 391,848
Small Business Administration loan-backed securities |  |
Securities Held to Maturity, Gross Unrealized Losses |  |
Twelve Months or More | 12,056 | 12,225
Securities Held to Maturity, Fair Value |  |
Twelve Months or More | 42,973 | 44,862
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 240 | 2,152
Twelve Months or More | 46,922 | 44,543
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 93,998 | 92,535
Twelve Months or More | 283,088 | 264,933
Corporate securities. |  |
Securities Available for Sale, Gross Unrealized Losses |  |
Less Than Twelve Months | 1,059 | 2,209
Twelve Months or More | 4,077 | 736
Securities Available for Sale, Fair Value |  |
Less Than Twelve Months | 5,439 | 28,374
Twelve Months or More | $ 19,983 | $ 4,264

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 Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479081/326-30-55-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-4 + 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/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-5 + 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://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-5 + 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/exampleRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 55 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479081/326-30-55-8 Reference 2: http://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-5 + 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://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 7 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-7 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479106/326-30-50-5 + 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: |