Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating activities
Net income	$ 6,625us-gaap_NetIncomeLoss	$ 5,120us-gaap_NetIncomeLoss	$ 3,862us-gaap_NetIncomeLoss
Adjustments to reconcile net income to cash provided by operating activities:
Provision for loan losses	4,175	3,475	4,550
Depreciation and other amortization	1,207	1,205	979
Accretion and amortization of securities discounts and premiums, net	375	659	850
Gain on sale of investment securities available for sale	(230)		(363)
Loss on sale of real estate owned	70	5	458
Write-down of real estate owned	320sfst_WriteDownOfRealEstateOwned	130sfst_WriteDownOfRealEstateOwned	419sfst_WriteDownOfRealEstateOwned
Compensation expense related to stock options and restricted stock grants	629us-gaap_ShareBasedCompensation	515us-gaap_ShareBasedCompensation	342us-gaap_ShareBasedCompensation
Gain on sale of loans held for sale	(2,699)us-gaap_GainLossOnSalesOfLoansNet	(1,088)us-gaap_GainLossOnSalesOfLoansNet
Loans originated and held for sale	(109,871)	(63,915)
Proceeds from sale of loans held for sale	104,416	63,451
Increase in cash surrender value of bank owned life insurance	(667)us-gaap_BankOwnedLifeInsuranceIncome	(658)us-gaap_BankOwnedLifeInsuranceIncome	(632)us-gaap_BankOwnedLifeInsuranceIncome
Increase in deferred tax asset	(1,422)	(460)	(297)
Decrease (increase) in other assets, net	(213)	(314)	1,017
Increase in other liabilities, net	2,019	463	690
Net cash provided by operating activities	4,734	8,588	11,875
Increase (decrease) in cash realized from:
Increase in loans, net	(143,585)	(93,473)	(53,279)
Purchase of property and equipment	(2,225)	(2,299)	(2,370)
Purchase of investment securities:
Available for sale	(2,073)	(3,260)	(35,014)
Other investments	(1,800)	(2,025)
Payment and maturity of investment securities:
Available for sale	4,928	9,555	12,031
Other investments	1,394	2,218	130
Proceeds from sale of investment securities:
Available for sale	11,917		45,143
Other investments		1,485
Purchase of life insurance policies		(2,000)
Proceeds from sale of other real estate owned	660	1,740	2,670
Net cash used for investing activities	(130,784)	(88,059)	(30,689)
Increase (decrease) in cash realized from:
Increase in deposits, net	108,588us-gaap_IncreaseDecreaseInDeposits	104,020us-gaap_IncreaseDecreaseInDeposits	13,387us-gaap_IncreaseDecreaseInDeposits
Increase (decrease) in note payable	(1,400)		1,400
Increase (decrease) in Federal Home Loan Bank advances and other borrowings	12,500	(13,190)	13,190
Cash dividend on preferred stock	(1,010)	(778)	(845)
Redemption of preferred stock	(15,299)	(980)	(1,100)
Issuance of common stock	24,376
Redemption of CPP warrant			(904)
Cash in lieu of fractional shares		(9)	(2)
Proceeds from the exercise of stock options and warrants	356	198	96
Net cash provided by financing activities	128,111	89,261	25,222
Net increase in cash and cash equivalents	2,061	9,790	6,408
Cash and cash equivalents, beginning of year	39,203	29,413	23,005
Cash and cash equivalents, end of year	41,264	39,203	29,413
Cash paid for
Interest	6,907us-gaap_InterestPaid	7,571us-gaap_InterestPaid	8,669us-gaap_InterestPaid
Income taxes	4,535us-gaap_IncomeTaxesPaid	2,876us-gaap_IncomeTaxesPaid	2,129us-gaap_IncomeTaxesPaid
Schedule of non-cash transactions
Foreclosure of real estate	3,159	1,354	1,580
Unrealized (gain) loss on securities, net of income taxes	$ (1,802)	$ 2,526	$ (378)

The net cash outflow for payment in lieu of fractional shares.

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The cash outflow associated with other investments held by the entity for investment purposes not otherwise defined in the taxonomy.

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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The cash inflow from the additional capital contribution to the entity.

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-Publisher FASB

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-Glossary Financing Activities

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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-Subparagraph (a),(b)

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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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-Publisher FASB

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The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer.

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-Publisher FASB

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Cash inflows (outflows) from issuing and redeeming redeemable preferred stock; includes convertible and nonconvertible redeemable preferred stock.

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-Publisher FASB

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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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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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 16

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The cash inflow associated with the sale of other investments not otherwise defined in the taxonomy.

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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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-Publisher FASB

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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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-Publisher SEC

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-Number 210

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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