Consolidated Statements of Cash Flows (Unaudited) (USD $)	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 1,504,627us-gaap_NetIncomeLoss	$ 1,302,520us-gaap_NetIncomeLoss
Adjustments To Reconcile Net Income To Net Cash Provided By Operating Activities:
Depreciation Expense	309,913us-gaap_DepreciationAndAmortization	298,464us-gaap_DepreciationAndAmortization
Amortization Of Intangible Assets	0us-gaap_AmortizationOfIntangibleAssets	11,970us-gaap_AmortizationOfIntangibleAssets
Stock Option Compensation Expense	3,169us-gaap_StockOptionPlanExpense	3,169us-gaap_StockOptionPlanExpense
Discount Accretion And Premium Amortization	1,252,401	1,564,137
Provisions For Losses On Loans	100,000	100,000
Income From Bank Owned Life Insurance	(87,000)	(205,827)
Gain On Sales Of Loans	(154,019)	(128,242)
Gain On Sales Of Mortgage-Backed Securities	(358,141)	(254,538)
(Gain) Loss On Sales Of Investment Securities	(1,128,798)	170,182
Gain On Sale Of Other Real Estate Owned	(57,040)	(41,845)
Write Down On Other Real Estate Owned	124,400	205,000
Amortization Of Deferred Fees On Loans	4,737	6,583
Proceeds From Sale Of Loans Held For Sale	5,860,686	3,808,798
Origination Of Loans Held For Sale	(5,720,512)	(5,356,132)
(Increase) Decrease In Accrued Interest Receivable:
Loans	(58,089)	50,450
Mortgage-Backed Securities	6,640	(1,003)
Investment Securities	77,870	122,005
Increase In Advance Payments By Borrowers	147,815	90,699
Other, Net	796,189	131,449
Net Cash Provided By Operating Activities	2,624,848	1,877,839
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchase Of Mortgage-Backed Securities Available For Sale	(15,625,415)	(25,481,066)
Principal Repayments On Mortgage-Backed Securities Available For Sale	7,421,481	7,413,707
Purchase Of Investment Securities Available For Sale	(41,533,216)	(5,971,321)
Maturities Of Investment Securities Available For Sale	9,257,293	5,914,950
Proceeds From Sale of Investment Securities Available For Sale	29,095,492	5,132,069
Proceeds From Sale of Mortgage-Backed Securities Available For Sale	7,266,721	8,802,113
Purchase Of FHLB Stock	(868,800)sfdl_PurchaseOfFhlbStock	(2,021,200)sfdl_PurchaseOfFhlbStock
Redemption Of FHLB Stock	1,817,300	2,885,800
Proceeds from Life Insurance Policies	0	484,415
Increase (Decrease) In Loans Receivable	(4,137,337)sfdl_IncreaseDecreaseInLoansReceivable	(4,611,602)sfdl_IncreaseDecreaseInLoansReceivable
Proceeds From Sale Of Repossessed Assets	263,340	155,945
Purchase And Improvement Of Premises And Equipment	(684,789)	(140,046)
Net Cash Provided By Investing Activities	546,744	1,786,968
CASH FLOWS FROM FINANCING ACTIVITIES:
Increase In Deposit Accounts	12,326,393	8,386,773
Proceeds From FHLB Advances	86,670,000	46,630,000
Repayment Of FHLB Advances	(105,370,000)	(59,084,335)
Increase in Other Borrowings, Net	1,816,809us-gaap_RepaymentsOfOtherDebt	1,263,649us-gaap_RepaymentsOfOtherDebt
Dividends To Preferred Stock Shareholders	(110,000)	(110,000)
Dividends To Common Stock Shareholders	(235,638)us-gaap_PaymentsOfDividendsCommonStock	(235,520)us-gaap_PaymentsOfDividendsCommonStock
Net Cash Used By Financing Activities	(4,902,436)	(3,149,433)
Net Increase (Decrease) In Cash And Cash Equivalents	(1,730,844)	515,374
Cash And Cash Equivalents At Beginning Of Period	10,192,702
Cash And Cash Equivalents At End Of Period	8,461,858	8,145,145
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Interest	1,201,870us-gaap_InterestPaid	1,497,977us-gaap_InterestPaid
Income Taxes	10,388us-gaap_IncomeTaxesPaid	24,100us-gaap_IncomeTaxesPaid
Supplemental Schedule Of Non Cash Transactions:
Transfers From Loans Receivable To Other Real Estate Owned	$ 3,587,840	$ 892,760

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The net increase(decrease) in interest income during the period representing the allocation of deferred loan origination fees less deferred loan origination costs using the effective interest method over the term of the debt arrangement to which they pertain taking into account the effect of prepayments.

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The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.

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The current period expense charged against earnings on long-lived, physical assets not used in production, and which are not intended for resale, to allocate or recognize the cost of such assets over their useful lives; or to record the reduction in book value of an intangible asset over the benefit period of such asset; or to reflect consumption during the period of an asset that is not used in production.

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Net gain (loss) resulting from the sales of securitized, pay-through debt securities collateralized by real estate mortgage loans (mortgages).

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The net gain (loss) resulting from sales and other disposals of other real estate owned, increases (decreases) in the valuation allowance for foreclosed real estate, and write-downs of other real estate owned after acquisition or physical possession.

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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Amount of cash outflow from payments for Federal Home Loan Bank (FHLBank) advances.

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Amount of cash outflow (inflow) from acquisition (sale) of Federal Home Loan Bank (FHLBank) stock.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow to acquire debt and equity securities not classified as either held-to-maturity securities or trading securities which would be classified as available-for-sale securities and reported at fair value, with unrealized gains and losses excluded from earnings and reported in a separate component of shareholders' equity.

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The cash outflow for the purchase of securities issued by a governmental agency or corporation (for example, GNMA or FHLMC) or by private issuers (for example, banks and mortgage banking enterprises) secured by and repaid from underlying mortgages, which were designated as available for sale when acquired.

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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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Amount of cash inflow from proceeds of Federal Home Loan Bank (FHLBank) advances.

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No definition available.

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The cash inflow for proceeds from life insurance policies for which the entity is the beneficiary.

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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 sale or maturity (principal being due) of 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 sale of debt and equity securities classified as available-for-sale securities.

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The cash inflow from the sale assets received in full or partial satisfaction of a receivable including real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts. Foreclosed assets also include loans that are treated as if the underlying collateral had been foreclosed because the institution has taken possession of the collateral, even though legal foreclosure or repossession proceedings have not taken place.

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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 the sale of securities issued by a governmental agency or corporation (for example, GNMA or FHLMC) or by private issuers (for example, banks and mortgage banking enterprises) secured by and repaid from underlying mortgages, which were designated as available for sale when acquired.

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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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Amount of the valuation allowance for real estate owned that was applied in the period against the carrying amount of real estate owned that was sold, written down or written off.

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The cash outflow for the payment of other borrowing not otherwise defined in the taxonomy.

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The noncash expense that accounts for the value of stock or unit options distributed to employees as compensation.

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Value of loans and leases held in the entity's portfolio transferred to loans and leases held-for-sale in noncash transactions.

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