XML 37 R26.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Investment Securities (Details 1) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Loan maturity distribution by type and related interest rate |  |
Available-for-sale Securities, Contractual Maturities, Less than one year, Value | $ 1,787 |
Available-for-sale Securities, Contractual Maturities, Less than one year, Yield | 1.21% |
Available-for-sale Securities, Contractual Maturities, One to five years, Value | $ 5,185 | $ 3,268
Available-for-sale Securities, Contractual Maturities, One to five years, Yield | 1.59% | 1.55%
Available-for-sale Securities, Contractual Maturities, Five to ten years, Value | $ 29,931 | $ 25,976
Available-for-sale Securities, Contractual Maturities, Five to ten years, Yield | 2.18% | 2.10%
Available-for-sale Securities, Contractual Maturities, Over ten years, Value | $ 41,537 | $ 35,236
Available-for-sale Securities, Contractual Maturities, Over ten years, Yield | 2.23% | 1.85%
Investment securities available for sale, Value | $ 78,440 | $ 64,480
Available-for-sale Securities, Contractual Securities, Yield Total | 2.13% | 1.93%
US government agencies [Member] |  |
Loan maturity distribution by type and related interest rate |  |
Available-for-sale Securities, Contractual Maturities, Less than one year, Value | $ 997 |
Available-for-sale Securities, Contractual Maturities, Less than one year, Yield | 1.15% |
Available-for-sale Securities, Contractual Maturities, One to five years, Value | $ 1,517 | $ 997
Available-for-sale Securities, Contractual Maturities, One to five years, Yield | 2.04% | 1.15%
Available-for-sale Securities, Contractual Maturities, Five to ten years, Value | $ 6,196 | $ 5,162
Available-for-sale Securities, Contractual Maturities, Five to ten years, Yield | 2.39% | 2.23%
Available-for-sale Securities, Contractual Maturities, Over ten years, Value |  |
Available-for-sale Securities, Contractual Maturities, Over ten years, Yield |  |
Investment securities available for sale, Value | $ 8,710 | $ 6,159
Available-for-sale Securities, Contractual Securities, Yield Total | 2.19% | 2.06%
SBA securities [Member] |  |
Loan maturity distribution by type and related interest rate |  |
Available-for-sale Securities, Contractual Maturities, Less than one year, Value |  |
Available-for-sale Securities, Contractual Maturities, Less than one year, Yield |  |
Available-for-sale Securities, Contractual Maturities, One to five years, Value |  |
Available-for-sale Securities, Contractual Maturities, One to five years, Yield |  |
Available-for-sale Securities, Contractual Maturities, Five to ten years, Value |  |
Available-for-sale Securities, Contractual Maturities, Five to ten years, Yield |  |
Available-for-sale Securities, Contractual Maturities, Over ten years, Value | $ 4,339 | $ 1,437
Available-for-sale Securities, Contractual Maturities, Over ten years, Yield | 2.48% | 1.32%
Investment securities available for sale, Value | $ 4,339 | $ 1,437
Available-for-sale Securities, Contractual Securities, Yield Total | 2.48% | 1.32%
State and political subdivisions [Member] |  |
Loan maturity distribution by type and related interest rate |  |
Available-for-sale Securities, Contractual Maturities, Less than one year, Value |  |
Available-for-sale Securities, Contractual Maturities, Less than one year, Yield |  |
Available-for-sale Securities, Contractual Maturities, One to five years, Value | $ 3,668 | $ 2,271
Available-for-sale Securities, Contractual Maturities, One to five years, Yield | 1.64% | 1.73%
Available-for-sale Securities, Contractual Maturities, Five to ten years, Value | $ 11,730 | $ 12,287
Available-for-sale Securities, Contractual Maturities, Five to ten years, Yield | 2.44% | 2.35%
Available-for-sale Securities, Contractual Maturities, Over ten years, Value | $ 4,959 | $ 5,916
Available-for-sale Securities, Contractual Maturities, Over ten years, Yield | 2.88% | 2.77%
Investment securities available for sale, Value | $ 20,357 | $ 20,474
Available-for-sale Securities, Contractual Securities, Yield Total | 2.40% | 2.40%
Mortgage-backed securities [Member] |  |
Loan maturity distribution by type and related interest rate |  |
Available-for-sale Securities, Contractual Maturities, Less than one year, Value | $ 790 |
Available-for-sale Securities, Contractual Maturities, Less than one year, Yield | 1.30% |
Available-for-sale Securities, Contractual Maturities, One to five years, Value |  |
Available-for-sale Securities, Contractual Maturities, One to five years, Yield |  |
Available-for-sale Securities, Contractual Maturities, Five to ten years, Value | $ 12,005 | $ 8,527
Available-for-sale Securities, Contractual Maturities, Five to ten years, Yield | 1.80% | 1.64%
Available-for-sale Securities, Contractual Maturities, Over ten years, Value | $ 32,239 | $ 27,883
Available-for-sale Securities, Contractual Maturities, Over ten years, Yield | 2.04% | 1.68%
Investment securities available for sale, Value | $ 45,034 | $ 36,410
Available-for-sale Securities, Contractual Securities, Yield Total | 1.97% | 1.67%

X
- Definition Contractual maturities yield on debt securities. + References No definition available. + Details
Name: | sfst_ContractualMaturitiesYieldOnDebtSecurities
Namespace Prefix: | sfst_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Contractual yield on debt securities expected to mature after five and through ten years. + References No definition available. + Details
Name: | sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterFiveAndThroughTenYears
Namespace Prefix: | sfst_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Contractual yield on debt securities expected to mature after one and through five year. + References No definition available. + Details
Name: | sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterOneAndThroughFiveYear
Namespace Prefix: | sfst_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Contractual yield on debt securities expected to mature after ten years. + References No definition available. + Details
Name: | sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureAfterTenYears
Namespace Prefix: | sfst_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Contractual yield on debt securities expected to mature next twelve month. + References No definition available. + Details
Name: | sfst_ContractualYieldOnDebtSecuritiesExpectedToMatureNextTwelveMonth
Namespace Prefix: | sfst_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 + Details
Name: | us-gaap_AvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of available-for-sale debt securities maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of available-for-sale debt securities maturing in the second fiscal year through the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Fair value of available-for-sale debt securities maturing after the tenth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtMaturitiesAfterTenYearsFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Fair value of available-for-sale debt securities maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62586-112803 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_UnderlyingAssetClassAxis=us-gaap_AgencySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=sfst_SbaSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_MortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |