Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income
Loans	$ 38,092	$ 34,242	$ 32,668
Investment securities	1,784	1,813	1,963
Federal funds sold	72us-gaap_InterestIncomeFederalFundsSold	63us-gaap_InterestIncomeFederalFundsSold	67us-gaap_InterestIncomeFederalFundsSold
Total interest income	39,948	36,118	34,698
Interest expense
Deposits	2,820us-gaap_InterestExpenseDeposits	2,862us-gaap_InterestExpenseDeposits	4,177us-gaap_InterestExpenseDeposits
Borrowings	4,088us-gaap_InterestExpenseBorrowings	4,235us-gaap_InterestExpenseBorrowings	4,525us-gaap_InterestExpenseBorrowings
Total interest expense	6,908us-gaap_InterestExpense	7,097us-gaap_InterestExpense	8,702us-gaap_InterestExpense
Net interest income	33,040us-gaap_InterestIncomeExpenseNet	29,021us-gaap_InterestIncomeExpenseNet	25,996us-gaap_InterestIncomeExpenseNet
Provision for loan losses	4,175	3,475	4,550
Net interest income after provision for loan losses	28,865	25,546	21,446
Noninterest income
Loan and mortgage fee income	2,854	1,235	1,044
Service fees on deposit accounts	923	879	767
Income from bank owned life insurance	667us-gaap_BankOwnedLifeInsuranceIncome	658us-gaap_BankOwnedLifeInsuranceIncome	632us-gaap_BankOwnedLifeInsuranceIncome
Gain on sale of investment securities	230us-gaap_GainLossOnSaleOfSecuritiesNet		363us-gaap_GainLossOnSaleOfSecuritiesNet
Other income	1,106us-gaap_NoninterestIncomeOther	1,030us-gaap_NoninterestIncomeOther	956us-gaap_NoninterestIncomeOther
Total noninterest income	5,780us-gaap_NoninterestIncome	3,802us-gaap_NoninterestIncome	3,762us-gaap_NoninterestIncome
Noninterest expenses
Compensation and benefits	14,043us-gaap_LaborAndRelatedExpense	12,302us-gaap_LaborAndRelatedExpense	10,073us-gaap_LaborAndRelatedExpense
Occupancy	2,978us-gaap_OccupancyNet	3,056us-gaap_OccupancyNet	2,468us-gaap_OccupancyNet
Real estate owned activity	647sfst_RealEstateOwnedActivity	179sfst_RealEstateOwnedActivity	939sfst_RealEstateOwnedActivity
Data processing and related costs	2,514	2,406	2,070
Insurance	832	818	1,367
Professional fees	952us-gaap_ProfessionalFees	858us-gaap_ProfessionalFees	841us-gaap_ProfessionalFees
Marketing	774us-gaap_MarketingExpense	731us-gaap_MarketingExpense	637us-gaap_MarketingExpense
Other	2,167us-gaap_OtherNoninterestExpense	1,462us-gaap_OtherNoninterestExpense	1,118us-gaap_OtherNoninterestExpense
Total noninterest expenses	24,907us-gaap_NoninterestExpense	21,812us-gaap_NoninterestExpense	19,513us-gaap_NoninterestExpense
Income before income tax expense	9,738	7,536	5,695
Income tax expense	3,113us-gaap_IncomeTaxExpenseBenefit	2,416us-gaap_IncomeTaxExpenseBenefit	1,833us-gaap_IncomeTaxExpenseBenefit
Net income	6,625us-gaap_NetIncomeLoss	5,120us-gaap_NetIncomeLoss	3,862us-gaap_NetIncomeLoss
Preferred stock dividends	915us-gaap_DividendsPreferredStock	771us-gaap_DividendsPreferredStock	840us-gaap_DividendsPreferredStock
Discount accretion			360
Redemption of preferred stock		(20)	(96)
Net income available to common shareholders	$ 5,710	$ 4,369	$ 2,758
Earnings per common share
Basic	$ 1.15us-gaap_EarningsPerShareBasic	$ 1.02us-gaap_EarningsPerShareBasic	$ 0.65us-gaap_EarningsPerShareBasic
Diluted	$ 1.10us-gaap_EarningsPerShareDiluted	$ 0.98us-gaap_EarningsPerShareDiluted	$ 0.64us-gaap_EarningsPerShareDiluted
Weighted average common shares outstanding
Basic	4,980,595	4,279,992	4,229,928
Diluted	5,199,376	4,458,918	4,339,958

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A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

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