XML 42 R31.htm IDEA: XBRL DOCUMENT v3.23.1

Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	$ 2,132,955	$ 2,053,318
Total consumer loans	1,284,990	1,220,045
Total gross loans, net of deferred fees	3,417,945	3,273,363
Owner occupied RE [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	615,094	612,901
Non-owner occupied RE [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	928,059	862,579
Construction [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	94,641
Business [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	495,161	468,112
Real Estate [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	993,258	931,278
Home Equity [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	180,974	179,300
Construction [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	71,137	80,415
Other [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	39,621	29,052
Construction [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans		109,726
One Year or Less [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	162,448	156,810
Total consumer loans	15,482	18,064
Total gross loans, net of deferred fees	177,930	174,874
One Year or Less [Member] | Owner occupied RE [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	9,295	10,574
One Year or Less [Member] | Non-owner occupied RE [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	57,909	44,570
One Year or Less [Member] | Construction [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	2,742
One Year or Less [Member] | Business [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	92,502	96,157
One Year or Less [Member] | Real Estate [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	9,871	12,137
One Year or Less [Member] | Home Equity [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	1,028	1,336
One Year or Less [Member] | Construction [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	1,014	665
One Year or Less [Member] | Other [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	3,569	3,926
One Year or Less [Member] | Construction [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans		5,509
After One but Within Five Years [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	836,015	784,019
Total consumer loans	88,978	81,953
Total gross loans, net of deferred fees	924,993	865,972
After One but Within Five Years [Member] | Owner occupied RE [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	144,602	133,017
After One but Within Five Years [Member] | Non-owner occupied RE [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	449,859	419,976
After One but Within Five Years [Member] | Construction [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	30,409
After One but Within Five Years [Member] | Business [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	211,145	194,489
After One but Within Five Years [Member] | Real Estate [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	46,324	38,948
After One but Within Five Years [Member] | Home Equity [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	20,452	20,933
After One but Within Five Years [Member] | Construction [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	227	182
After One but Within Five Years [Member] | Other [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	21,975	21,890
After One but Within Five Years [Member] | Construction [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans		36,537
After Five but Within Fifteen Years [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	1,059,007	1,026,357
Total consumer loans	480,023	437,947
Total gross loans, net of deferred fees	1,539,030	1,464,304
After Five but Within Fifteen Years [Member] | Owner occupied RE [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	418,450	420,881
After Five but Within Fifteen Years [Member] | Non-owner occupied RE [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	394,421	371,208
After Five but Within Fifteen Years [Member] | Construction [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	59,103
After Five but Within Fifteen Years [Member] | Business [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	187,033	173,259
After Five but Within Fifteen Years [Member] | Real Estate [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	280,204	260,005
After Five but Within Fifteen Years [Member] | Home Equity [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	154,189	151,696
After Five but Within Fifteen Years [Member] | Construction [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	32,358	23,788
After Five but Within Fifteen Years [Member] | Other [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	13,272	2,458
After Five but Within Fifteen Years [Member] | Construction [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans		61,009
After Fifteen Years [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	75,485	86,132
Total consumer loans	700,507	682,081
Total gross loans, net of deferred fees	775,992	768,213
After Fifteen Years [Member] | Owner occupied RE [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	42,747	48,429
After Fifteen Years [Member] | Non-owner occupied RE [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	25,870	26,825
After Fifteen Years [Member] | Construction [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	2,387
After Fifteen Years [Member] | Business [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans	4,481	4,207
After Fifteen Years [Member] | Real Estate [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	656,859	620,188
After Fifteen Years [Member] | Home Equity [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	5,305	5,335
After Fifteen Years [Member] | Construction [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	37,538	55,780
After Fifteen Years [Member] | Other [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total consumer loans	$ 805	778
After Fifteen Years [Member] | Construction [Member]
Loans and Allowance for Credit Losses (Details) - Schedule of loan maturity distribution by type and related interest rate [Line Items]
Total commercial loans		$ 6,671

X

- Definition

Net charge-off rate is the annualized ratio of net charge-offs (gross charge-offs less recoveries of delinquent debt) to average outstanding loans.

+ References

No definition available.

+ Details

Name:	sfst_LoansAndLeasesReceivableBeforeFeesGrossAmount
Namespace Prefix:	sfst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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

X

- Definition

Amount, before allowance and fees, of loans and leases receivable. Excludes loans and leases covered under loss sharing agreements.

+ References

No definition available.

+ Details

Name:	sfst_TotalCommercial
Namespace Prefix:	sfst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount, before allowance and fees, of loans and leases receivable. Excludes loans and leases covered under loss sharing agreements.

+ References

No definition available.

+ Details

Name:	sfst_TotalConsumer
Namespace Prefix:	sfst_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	srt_ProductOrServiceAxis=sfst_OwnerOccupiedREMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=sfst_NonownerOccupiedREMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=sfst_Construction1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=sfst_BusinessMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_RealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=sfst_HomeEquitysMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_ConstructionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=sfst_OtherMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=sfst_Construction3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=sfst_OneYearOrLessMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=sfst_AfterOneButWithinFiveYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=sfst_AfterFiveButWithinFifteenYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=sfst_AfterFifteenYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: