XML 36 R26.htm IDEA: XBRL DOCUMENT v3.22.2

Investment Securities (Details) - Schedule of amortized costs and fair value of investment securities - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Available for sale
Available for sale, Amortized Cost	$ 111,830	$ 121,218
Available for sale, Gross Unrealized Gains	4	944
Available for sale, Gross Unrealized Losses	12,843	1,881
Available for sale, Fair Value	98,991	120,281
Corporate bonds [Member]
Available for sale
Available for sale, Amortized Cost	2,185	2,198
Available for sale, Gross Unrealized Gains
Available for sale, Gross Unrealized Losses	204	10
Available for sale, Fair Value	1,981	2,188
US treasuries [Member]
Available for sale
Available for sale, Amortized Cost	999	999
Available for sale, Gross Unrealized Gains
Available for sale, Gross Unrealized Losses	94	7
Available for sale, Fair Value	905	992
US Government Agencies [Member]
Available for sale
Available for sale, Amortized Cost	13,005	14,504
Available for sale, Gross Unrealized Gains		1
Available for sale, Gross Unrealized Losses	1,752	336
Available for sale, Fair Value	11,253	14,169
State and Political Subdivisions [Member]
Available for sale
Available for sale, Amortized Cost	23,071	24,887
Available for sale, Gross Unrealized Gains	4	549
Available for sale, Gross Unrealized Losses	3,096	260
Available for sale, Fair Value	19,979	25,176
Asset-backed Securities [Member]
Available for sale
Available for sale, Amortized Cost	7,922	10,136
Available for sale, Gross Unrealized Gains		45
Available for sale, Gross Unrealized Losses	169	17
Available for sale, Fair Value	7,753	10,164
Mortgage-backed securities [Member]
Available for sale
Available for sale, Amortized Cost	64,648	68,065
Available for sale, Gross Unrealized Gains		340
Available for sale, Gross Unrealized Losses	7,528	1,251
Available for sale, Fair Value	57,120	67,154
Mortgage-backed securities [Member] | FHLMC [Member]
Available for sale
Available for sale, Amortized Cost	21,809	23,057
Available for sale, Gross Unrealized Gains		102
Available for sale, Gross Unrealized Losses	2,835	494
Available for sale, Fair Value	18,974	22,665
Mortgage-backed securities [Member] | FNMA [Member]
Available for sale
Available for sale, Amortized Cost	36,865	40,924
Available for sale, Gross Unrealized Gains		235
Available for sale, Gross Unrealized Losses	4,200	660
Available for sale, Fair Value	32,665	40,499
Mortgage-backed securities [Member] | GNMA [Member]
Available for sale
Available for sale, Amortized Cost	5,974	4,084
Available for sale, Gross Unrealized Gains		3
Available for sale, Gross Unrealized Losses	493	97
Available for sale, Fair Value	$ 5,481	3,990
SBA Securities [Member]
Available for sale
Available for sale, Amortized Cost		429
Available for sale, Gross Unrealized Gains		9
Available for sale, Gross Unrealized Losses
Available for sale, Fair Value		$ 438

X

- References

No definition available.

+ Details

Name:	sfst_AvailableForSaleAbstract
Namespace Prefix:	sfst_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

+ Details

Name:	us-gaap_AvailableForSaleDebtSecuritiesAmortizedCostBasis
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).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (aa)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CorporateBondSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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_AgencySecuritiesMember
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=us-gaap_AssetBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	sfst_TypeOfInvestmentAxis=us-gaap_FederalHomeLoanBankCertificatesAndObligationsFHLBMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	sfst_TypeOfInvestmentAxis=us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	sfst_TypeOfInvestmentAxis=us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=sfst_SbaSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: