Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Operating activities
Net income	$ 2,028us-gaap_NetIncomeLoss	$ 1,250us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash provided by operating activities:
Provision for loan losses	625	1,000
Depreciation and other amortization	299	294
Accretion and amortization of securities discounts and premium, net	73	100
Gain on sale of investment secruities available for sale	(259)us-gaap_GainLossOnSaleOfInvestments
Gain on sale of real estate owned	(74)sfst_GainLossOnSaleOfRealEstateOwned
Write-down of real estate owned	737sfst_WriteDownOfRealEstateOwned
Compensation expense related to stock options and grants	193us-gaap_ShareBasedCompensation	160us-gaap_ShareBasedCompensation
Gain on sale of loans held for sale	(1,163)us-gaap_GainLossOnSalesOfLoansNet	(303)us-gaap_GainLossOnSalesOfLoansNet
Loans originated and held for sale	(51,110)	(12,024)
Proceeds from sale of loans held for sale	49,194	12,910
Increase in cash surrender value of bank owned life insurance	(166)us-gaap_BankOwnedLifeInsuranceIncome	(162)us-gaap_BankOwnedLifeInsuranceIncome
Increase in deferred tax asset	(102)	(554)
(Increase) decrease in other assets, net	11	(17)
Decrease in other liabilities	(992)	(150)
Net cash (used for) provided by operating activities	(706)	2,504
Increase (decrease) in cash realized from:
Origination of loans, net	(38,011)	(42,614)
Purchase of property and equipment	(172)	(583)
Purchase of investment securities:
Available for sale		(1,292)
Other	(124)
Payments and maturity of investment securities:
Available for sale	1,010	1,051
Other	1,140	156
Proceeds from sale of investment securities available for sale	5,771
Proceeds from sale of real estate owned	74	50
Net cash used for investing activities	(30,312)	(43,232)
Increase (decrease) in cash realized from:
Increase in deposits, net	61,403us-gaap_IncreaseDecreaseInDeposits	42,093us-gaap_IncreaseDecreaseInDeposits
Decrease in Federal Home Loan Bank advances and other borrowings	(20,000)
Cash dividend on preferred stock		(181)
Redemption of preferred stock		(4,057)
Issuance of common stock		5,950
Proceeds from the exercise of stock options and warrants	75	219
Net cash provided by financing activities	41,478	44,024
Net increase in cash and cash equivalents	10,460	3,296
Cash and cash equivalents at beginning of the period	41,264	39,203
Cash and cash equivalents at end of the period	51,724	42,499
Cash paid for
Interest	1,835us-gaap_InterestPaid	1,937us-gaap_InterestPaid
Income taxes	1,200us-gaap_IncomeTaxesPaid	1,147us-gaap_IncomeTaxesPaid
Schedule of non-cash transactions
Real estate acquired in settlement of loans
Unrealized (gain) loss on securities, net of income taxes	$ (236)	$ 769

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The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities.

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The cash inflow associated with the maturity (principal being due), prepayment and call (request of early payment) of other investments not otherwise defined in the taxonomy.

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The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

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The cash inflow from proceeds From Sales of Wholly Owned Real Estate and Real Estate Acquired in Settlement of Loans.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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