2.4.0.80012 - Disclosure - Summary of Significant Accounting Policies (Policies)truefalsefalse1false falsefalseFrom2013-01-01to2013-06-30http://www.sec.gov/CIK0000315849duration2013-01-01T00:00:002013-06-30T00:00:001true 1us-gaap_AccountingPoliciesAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Accounting Policies [Abstract]2false 2us-gaap_ConsolidationPolicyTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 Principles of Consolidation   The consolidated financial statements include the accounts of Southwest Georgia Financial Corporation and its wholly-owned direct and indirect Subsidiaries, Southwest Georgia Bank (the Bank) and Empire Financial Services, Inc. (Empire). All significant intercompany accounts and transactions have been eliminated in the consolidation.falsefalsefalsenonnum:textBlockItemTypenaDisclosure of accounting policy regarding (1) the principles it follows in consolidating or combining the separate financial statements, including the principles followed in determining the inclusion or exclusion of subsidiaries or other entities in the consolidated or combined financial statements and (2) its treatment of interests (for example, common stock, a partnership interest or other means of exerting influence) in other entities, for example consolidation or use of the equity or cost methods of accounting. The accounting policy may also address the accounting treatment for intercompany accounts and transactions, noncontrolling interest, and the income statement treatment in consolidation for issuances of stock by a subsidiary.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 97-2 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 4 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph k -Article 1 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 5, 6, 16-19 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 140 -Paragraph 46 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 4 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02, 03 -Article 3A Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 96-16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 18 -Paragraph 20 -Subparagraph a(2) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 46R -Paragraph 14, 15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2197480 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=18733093&loc=d3e5614-111684 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.3A-02) -URI http://asc.fasb.org/extlink&oid=6959686&loc=d3e355033-122828 Reference 15: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 51 -Paragraph 2-6 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 16: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 40 -Section 45 -URI http://asc.fasb.org/section&trid=2197723 Reference 17: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2196966 Reference 18: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2197087 Reference 19: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=16385135&loc=d3e33801-111570 false0Principles of Consolidation3false 2us-gaap_NatureOfOperationsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 Nature of Operations   The Corporation offers comprehensive financial services to consumer, business, and governmental customers through its banking offices in southwest Georgia. Its primary deposit products are money market, NOW, savings and certificates of deposit, and its primary lending products are consumer and commercial mortgage loans. The Corporation provides, in addition to conventional banking services, investment planning and management, trust management, mortgage banking, and commercial and individual insurance products. Insurance products and advice are provided by the Banks Southwest Georgia Insurance Services Division. Mortgage banking for primarily commercial properties is provided by Empire, a mortgage banking services subsidiary.   The Corporations primary business is providing banking services through the Bank to individuals and businesses principally in Colquitt County, Baker County, Thomas County, Worth County, Lowndes County and the surrounding counties of southwest Georgia. The Bank also operates Empire in Milledgeville, Georgia. Our first full-service banking center in Valdosta, Georgia opened in June 2010 and a mortgage origination office was opened in January 2011 in Valdosta, Georgia. Our second banking center in Valdosta opened in March 2012.falsefalsefalsenonnum:textBlockItemTypenaThe entire disclosure for the nature of an entity's business, the major products or services it sells or provides and its principal markets, including the locations of those markets. If the entity operates in more than one business, the disclosure also indicates the relative importance of its operations in each business and the basis for the determination (for example, assets, revenues, or earnings).Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6003-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-6 -Paragraph 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false0Nature of Operations4false 2us-gaap_UseOfEstimatesus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 Use of Estimates   The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.   Material estimates that are particularly susceptible to significant change relate to the determination of the allowance for loan losses and the valuation of real estate acquired in connection with foreclosures or in satisfaction of loans. In connection with these evaluations, management obtains independent appraisals for significant properties.   A substantial portion of the Corporations loans are secured by real estate located primarily in Georgia. Accordingly, the ultimate collection of these loans is susceptible to changes in the real estate market conditions of this market area.falsefalsefalsenonnum:textBlockItemTypenaDisclosure of accounting policy for the use of estimates in the preparation of financial statements in conformity with generally accepted accounting principles.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6143-108592 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6132-108592 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 275 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6927468&loc=d3e6061-108592 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 94-6 -Paragraph 11, 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false0Use of Estimates5false 2us-gaap_CashAndCashEquivalentsPolicyTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 Cash and Cash Equivalents and Statement of Cash Flows   For purposes of reporting cash flows, the Corporation considers cash and cash equivalents to include all cash on hand, deposit amounts due from banks, interest-bearing deposits in other banks, and federal funds sold. The Corporation maintains its cash balances in several financial institutions. Accounts at the financial institutions are secured by the Federal Deposit Insurance Corporation up to $250,000. Uninsured deposits aggregate to $36,426 at June 30, 2013.falsefalsefalsenonnum:textBlockItemTypenaDisclosure of accounting policy for cash and cash equivalents, including the policy for determining which items are treated as cash equivalents. Other information that may be disclosed includes (1) the nature of any restrictions on the entity's use of its cash and cash equivalents, (2) whether the entity's cash and cash equivalents are insured or expose the entity to credit risk, (3) the classification of any negative balance accounts (overdrafts), and (4) the carrying basis of cash equivalents (for example, at cost) and whether the carrying amount of cash equivalents approximates fair value.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4273-108586 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 305 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2122427 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Financial Reporting Release (FRR) -Number 203 -Paragraph 02-03 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Technical Practice Aid (TPA) -Number 2110 -Paragraph 6 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 7, 8, 9, 10 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false0Cash and Cash Equivalents and Statement of Cash Flows6false 2us-gaap_InvestmentPolicyTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseverboseLabel1falsefalsefalse00 Investment Securities   Debt securities that management has the positive intent and ability to hold to maturity are classified as held to maturity and recorded at amortized cost. Securities not classified as held to maturity or trading, including equity securities with readily determinable fair values, are classified as available for sale and recorded at fair value with unrealized gains and losses reported in other comprehensive income.   Purchase premiums and discounts are recognized in interest income using the interest method over the terms of the securities. Declines in the fair value of held-to-maturity and available-for-sale securities below their cost that are deemed to be other-than-temporarily impaired are reflected in earnings as realized losses. In estimating other-than-temporary impairment losses, management considers (1) the length of time and the extent to which the fair value has been less than cost, (2) the financial condition and near-term prospects of the issuer, and (3) the intent and ability of the Corporation to retain its investment in the issuer for a period of time sufficient to allow for any anticipated recovery in fair value. Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method.falsefalsefalsenonnum:textBlockItemTypenaDisclosure of accounting policy for investments in financial assets, including marketable securities (debt and equity securities with readily determinable fair values), investments accounted for under the equity method and cost method, securities borrowed and loaned, and repurchase and resale agreements. For marketable securities, the disclosure may include the entity's accounting treatment for transfers between investment categories and how the fair values for such securities are determined. Also, for all investments, an entity may describe its policy for assessing, recognizing and measuring impairment of the investment.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 115 -Paragraph 7-16 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 10, 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 325 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6872867&loc=d3e40691-111596 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7491637&loc=d3e13433-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section M Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS115-1/124-1 -Paragraph 7-18 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 2, 12 -Article 5 false0Investment Securities7false 2us-gaap_PropertyPlantAndEquipmentPolicyTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 Premises and Equipment   Premises and equipment are stated at cost, less accumulated depreciation and amortization. Depreciation has been calculated primarily using the straight-line method for buildings and building improvements over the assets estimated useful lives. Equipment and furniture are depreciated using the modified accelerated recovery system method over the assets estimated useful lives for financial reporting and income tax purposes for assets purchased on or before December 31, 2003. For assets acquired since 2003, the Corporation used the straight-line method of depreciation. The following estimated useful lives are used for financial statement purposes:   <table cellspacing="0" cellpadding="0" style="font: 10pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"> <tr style="vertical-align: top"> <td style="width: 50%; padding-right: 5.4pt; padding-left: 5.4pt; line-height: 115%">Land improvements</td> <td style="width: 25%; padding-right: 5.4pt; padding-left: 5.4pt; text-align: right; line-height: 115%">5 31 years</td> <td style="width: 25%; padding-right: 5.4pt; padding-left: 5.4pt; text-align: right; line-height: 115%"> </td></tr> <tr style="vertical-align: top"> <td style="padding-right: 5.4pt; padding-left: 5.4pt; line-height: 115%">Building and improvements</td> <td style="padding-right: 5.4pt; padding-left: 5.4pt; text-align: right; line-height: 115%">10 40 years</td> <td style="padding-right: 5.4pt; padding-left: 5.4pt; text-align: right; line-height: 115%"> </td></tr> <tr style="vertical-align: top"> <td style="padding-right: 5.4pt; padding-left: 5.4pt; line-height: 115%">Machinery and equipment</td> <td style="padding-right: 5.4pt; padding-left: 5.4pt; text-align: right; line-height: 115%">5 10 years</td> <td style="padding-right: 5.4pt; padding-left: 5.4pt; text-align: right; line-height: 115%"> </td></tr> <tr style="vertical-align: top"> <td style="padding-right: 5.4pt; padding-left: 5.4pt; line-height: 115%">Computer equipment</td> <td style="padding-right: 5.4pt; padding-left: 5.4pt; text-align: right; line-height: 115%">3 5 years</td> <td style="padding-right: 5.4pt; padding-left: 5.4pt; text-align: right; line-height: 115%"> </td></tr> <tr style="vertical-align: top"> <td style="padding-right: 5.4pt; padding-left: 5.4pt; line-height: 115%">Office furniture and fixtures</td> <td style="padding-right: 5.4pt; padding-left: 5.4pt; text-align: right; line-height: 115%">5 10 years</td> <td style="padding-right: 5.4pt; padding-left: 5.4pt; text-align: right; line-height: 115%"> </td></tr> </table>   All of the Corporations leases are operating leases and are not capitalized as assets for financial reporting purposes. Maintenance and repairs are charged to expense and betterments are capitalized.   Long-lived assets are evaluated regularly for other-than-temporary impairment. If circumstances suggest that their value may be impaired and the write-down would be material, an assessment of recoverability is performed prior to any write-down of the asset. Impairment on intangibles is evaluated at each balance sheet date or whenever events or changes in circumstances indicate that the carrying amount should be assessed. Impairment, if any, is recognized through a valuation allowance with a corresponding charge recorded in the income statement.falsefalsefalsenonnum:textBlockItemTypenaDisclosure of accounting policy for property, plant and equipment which may include the basis of such assets, depreciation methods used and estimated useful lives, the entity's capitalization policy, including its accounting treatment for costs incurred for repairs and maintenance activities, whether such asset balances include capitalized interest and the method by which such is calculated, how disposals of such assets are accounted for and how impairment of such assets is assessed and recognized.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2155824 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 22 -Paragraph 12, 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Research Bulletin (ARB) -Number 43 -Section C -Paragraph 5 -Chapter 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 12 -Paragraph 5 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 13 -Subparagraph a -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 34 -Paragraph 8, 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false0Premises and Equipment8false 2us-gaap_LoansAndLeasesReceivableAllowanceForLoanLossesPolicyus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 Loans and Allowances for Loan Losses   Loans are stated at principal amounts outstanding less unearned income and the allowance for loan losses. Interest income is credited to income based on the principal amount outstanding at the respective rate of interest except for interest on certain installment loans made on a discount basis which is recognized in a manner that results in a level-yield on the principal outstanding.   Accrual of interest income is discontinued on loans when, in the opinion of management, collection of such interest income becomes doubtful. Accrual of interest on such loans is resumed when, in managements judgment, the collection of interest and principal becomes probable.   Fees on loans and costs incurred in origination of most loans are recognized at the time the loan is placed on the books. Because loan fees are not significant, the results on operations are not materially different from the results which would be obtained by accounting for loan fees and costs as amortized over the term of the loan as an adjustment of the yield.   A loan is considered impaired when, based on current information and events, it is probable that the Corporation will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrowers prior payment record, and the amount of the shortfall in relation to the principal and interest owed. Impairment is measured on a loan by loan basis for commercial and construction loans by either the present value of expected future cash flows discounted at the loans effective interest rate, the loans obtainable market price, or the fair value of the collateral if the loan is collateral dependent.   Large groups of smaller balance homogeneous loans are collectively evaluated for impairment. Accordingly, the Corporation does not separately identify individual consumer and residential loans for impairment disclosures.   The allowance for loan losses is established through a provision for loan losses charged to expense. Loans are charged against the allowance for loan losses when management believes the collection of the principal is unlikely. The allowance is an amount which management believes will be adequate to absorb estimated losses on existing loans that may become uncollectible based on evaluation of the collectability of loans and prior loss experience. This evaluation takes into consideration such factors as changes in the nature and volume of the loan portfolios, current economic conditions that may affect the borrowers ability to pay, overall portfolio quality, and review of specific problem loans.   Management believes that the allowance for loan losses is adequate. While management uses available information to recognize losses on loans, future additions to the allowance may be necessary based upon changes in economic conditions. Also, various regulatory agencies, as an integral part of their examination process, periodically review the Corporations allowance for loan losses. Such agencies may require the Corporation to recognize additions to the allowance based on their judgments of information available to them at the time of their examination.falsefalsefalsenonnum:textBlockItemTypenaDisclosure of accounting policy for estimating the allowance for losses on loans and lease receivables. The disclosure may include (a) how the entity determines each element of the allowance, (b) which loans are evaluated individually and which loans are evaluated as a group, (c) how the entity determines both the allocated and unallocated portions of the allowance, (d) how the entity determines the loss factors applied to graded loans in order to develop a general allowance, and (e) what self-correcting mechanism the entity uses to reduce differences between estimated and actual losses.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5144-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 9 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false0Loans and Allowances for Loan Losses9false 2SGB_ForeclosedAssetsPolicyTextBlockSGB_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 Foreclosed Assets   In accordance with policy guidelines and regulations, properties acquired through, or in lieu of, loan foreclosure are held for sale and are initially recorded at the lower of cost or fair value at the date of foreclosure, establishing a new cost basis. Subsequent to foreclosure, valuations are periodically performed by management and the assets are carried at the lower of carrying amount or fair value less cost to sell. A valuation allowance is established to record market value changes in foreclosed assets. Revenue and expenses from operations and changes in the valuation allowance are included in net expenses from foreclosed assets. No additional provisions were added in the first six months of 2013. As of June 30, 2013, the valuation allowance for foreclosed asset losses remains at $895,000.falsefalsefalsenonnum:textBlockItemTypenaForeclosed Assets [Policy Text Block]No definition available.false0Foreclosed Assets10false 2us-gaap_IntangibleAssetsFiniteLivedPolicyus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 Intangible Assets   Intangible assets are amortized over a determined useful life using the straight-line basis. These assets are evaluated annually as to the recoverability of the carrying value. The remaining intangibles have a remaining life of two to eight years.falsefalsefalsenonnum:textBlockItemTypenaDisclosure of accounting policy for finite-lived intangible assets. This accounting policy also might address: (1) the amortization method used; (2) the useful lives of such assets; and (3) how the entity assesses and measures impairment of such assets.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -URI http://asc.fasb.org/subtopic&trid=2144471 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 7-18, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 11-15 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false0Intangible Assets11false 2us-gaap_FairValueOfFinancialInstrumentsPolicyus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 Credit Related Financial Instruments   In the ordinary course of business, the Corporation has entered into commitments to extend credit, including commitments under credit card arrangements, commercial letters of credit, and standby letters of credit. Such financial instruments are recorded when they are funded.falsefalsefalsenonnum:textBlockItemTypenaDisclosure of accounting policy for determining the fair value of financial instruments.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2155942 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 107 -Paragraph 8, 10, 12, 13, 14 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false0Credit Related Financial Instruments12false 2us-gaap_PensionAndOtherPostretirementPlansPolicyus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 Retirement Plans   The Corporation and its subsidiaries have post-retirement plans covering substantially all employees. The Corporation makes annual contributions to the plans in amounts not exceeding the regulatory requirements.falsefalsefalsenonnum:textBlockItemTypenaDisclosure of accounting policy for pension and other postretirement benefit plans. This accounting policy may address (1) the types of plans sponsored by the entity, and the benefits provided by each plan (2) groups that participate in (or are covered by) each plan (3) how plan assets, liabilities and expenses are measured, including the use of any actuaries and (4) significant assumptions used by the entity to value plan assets and liabilities and how such assumptions are derived.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -URI http://asc.fasb.org/subtopic&trid=2235116 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 8 -Subparagraph m -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 15-19, 63, 64 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 19, 20, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 4, 5, 6, 7 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5, 6, 7, 9, 11, 12, 13 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph q -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -URI http://asc.fasb.org/subtopic&trid=2235144 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -URI http://asc.fasb.org/subtopic&trid=2235172 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -URI http://asc.fasb.org/subtopic&trid=2235074 false0Retirement Plans13false 2SGB_BankOwnedLifeInsurancePolicyTextBlockSGB_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 Bank Owned Life Insurance   The Corporations subsidiary bank has bank owned life insurance policies on a group of employees. Banking laws and regulations allow the Bank to purchase life insurance policies on certain employees in order to help offset the Banks overall employee compensation costs. At June 30, 2013, and December 31, 2012, the policies had a value of $4,890,000 and $4,766,513, respectively, and were 16.2% and 16.0%, respectively, of stockholders equity. These values are within regulatory guidelines.falsefalsefalsenonnum:textBlockItemTypenaBank Owned Life Insurance [Policy Text Block]No definition available.false0Bank Owned Life Insurance14false 2us-gaap_IncomeTaxPolicyTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 Income Taxes   The Corporation and its subsidiaries file a consolidated income tax return. Each subsidiary computes its income tax expense as if it filed an individual return except that it does not receive any portion of the surtax allocation. Any benefits or disadvantages of the consolidation are absorbed by the parent company.  Each subsidiary pays its allocation of federal income taxes to the parent company or receives payment from the parent company to the extent that tax benefits are realized.   The Corporation reports income under Accounting Standards Codification Topic 740, Income Taxes, which requires recognition of deferred tax liabilities and assets for the expected future tax consequences of events that have been included in the financial statements or tax returns.  Under this method, deferred tax liabilities and assets are determined based on the difference between the financial statement and tax bases of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. Recognition of deferred tax assets is based on managements belief that it is more likely than not that the tax benefit associated with certain temporary differences and tax credits will be realized.   The Corporation will recognize a tax position as a benefit only if it is more likely than not that the tax position would be sustained in a tax examination, with an examination being presumed to occur. The amount recognized is the largest amount of a tax benefit that is greater than fifty percent likely of being realized on examination. No benefit is recorded for tax positions that do not meet the more than likely than not test.   The Corporation recognizes penalties related to income tax matters in income tax expense.  The Corporation is subject to U.S. federal and Georgia state income tax audit for returns for the tax period ending December 31, 2010 and subsequent years. falsefalsefalsenonnum:textBlockItemTypenaDisclosure of accounting policy for income taxes, which may include its accounting policies for recognizing and measuring deferred tax assets and liabilities and related valuation allowances, recognizing investment tax credits, operating loss carryforwards, tax credit carryforwards, and other carryforwards, methodologies for determining its effective income tax rate and the characterization of interest and penalties in the financial statements.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 4 -Paragraph 11 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 20 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32247-109318 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32840-109319 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -URI http://asc.fasb.org/subtopic&trid=2144749 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 740 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6491622&loc=d3e9504-115650 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -URI http://asc.fasb.org/subtopic&trid=2144681 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 17 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32809-109319 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32280-109318 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 6-34, 43, 47, 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false0Income Taxes15false 2SGB_TrustDepartmentPolicyTextBlockSGB_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 Trust Department   Trust income is included in the accompanying consolidated financial statements on the cash basis in accordance with established industry practices. Reporting of such fees on the accrual basis would have no material effect on reported income.falsefalsefalsenonnum:textBlockItemTypenaTrust Department [Policy Text Block]No definition available.false0Trust Department16false 2SGB_ServicingAndOriginationFeesOnLoansPolicyTextBlockSGB_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 Servicing and Origination Fees on Loans   The Corporation from the Banks subsidiary, Empire, recognizes as income in the current period all loan origination and brokerage fees collected on loans originated and closed for investing participants. Loan servicing fees are based on a percentage of loan interest paid by the borrower and recognized over the term of the loan as loan payments are received. Empire does not directly fund any mortgages and acts as a service-oriented broker for participating mortgage lenders. Fees charged for continuing servicing fees are comparable with market rates charged in the industry. Based on these facts and after a thorough analysis and evaluation of deferred mortgage servicing costs as defined under Accounting Standards Codification (ASC) 860, unrecognized mortgage servicing assets are considered insignificant and immaterial to be recognized. Late charges assessed on past due payments are recognized as income by the Corporation when collected.falsefalsefalsenonnum:textBlockItemTypenaServicing and origination fees on loans [Policy Text Block]No definition available.false0Servicing and Origination Fees on Loans17false 2us-gaap_AdvertisingCostsPolicyTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 Advertising Costs   It is the policy of the Corporation to expense advertising costs as they are incurred. The Corporation does not engage in any direct-response advertising and accordingly has no advertising costs reported as assets on its balance sheet. Costs expensed were $37,875 and $75,317 for the three and six-month periods ended June 30, 2013.falsefalsefalsenonnum:textBlockItemTypenaDisclosure of accounting policy for advertising costs. For those costs that cannot be capitalized, discloses whether such costs are expensed as incurred or the first period in which the advertising takes place. For direct response advertising costs that are capitalized, describes those assets and the accounting policy used, including a description of the qualifying activity, the types of costs capitalized and the related amortization period. An entity also may disclose its accounting policy for cooperative advertising arrangements.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367646&loc=d3e18780-107790 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 20 -Section 55 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6387522&loc=d3e8384-108330 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Statement of Position (SOP) -Number 93-7 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 20 -URI http://asc.fasb.org/subtopic&trid=2127066 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 340 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6387501&loc=d3e8275-108329 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 02-16 -Paragraph 6 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. false0Advertising Costs18false 2SGB_RecentMarketAndRegulatoryDevelopmentsPolicyTextBlockSGB_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 Recent Market and Regulatory Developments   The financial services industry is continuing to face unprecedented challenges in the face of the current national and global economic environment. The global and U.S. economies continue to experience significantly reduced business activity. While recently showing signs of improvement, dramatic declines in the housing market during the past several years, with falling home prices and increasing foreclosures and unemployment, have resulted in significant write-downs of asset values by financial institutions, including government-sponsored entities and major commercial and investment banks. These write-downs, initially of mortgage-backed securities but spreading to credit default swaps and other derivative securities, have caused many financial institutions to seek additional capital; to merge with larger and stronger institutions; and, in some cases, to fail. The Corporation is fortunate that the markets it serves have been impacted to a lesser extent than many areas around the country.   In September 2009, the FDIC adopted a Notice of Proposed Rulemaking (NPR) that would require insured institutions to prepay their estimated quarterly risk-based assessments for the fourth quarter of 2009 and for all of 2010, 2011 and 2012. The FDIC Board voted to adopt a uniform three-basis point increase in assessment rates effective January 1, 2011, and extend the restoration period from seven to eight years. This rule was finalized in November 2009. As a result, the Corporation carried a prepaid asset that the Corporations quarterly risk-based deposit insurance assessments were paid from until the remaining $393 thousand was returned to the Corporation on June 28, 2013.   On July 21, 2010, the Dodd-Frank Wall Street Reform and Consumer Protection Act (the Dodd-Frank Act) was enacted. The Dodd-Frank Act was intended to address many issues arising in the recent financial crisis and is exceedingly broad in scope affecting many aspects of bank and financial market regulation. The Dodd-Frank Act requires, or permits by implementing regulation, enhanced prudential standards for banks and bank holding companies inclusive of capital, leverage, liquidity, concentration and exposure measures. In addition, traditional bank regulatory principles such as restrictions on transactions with affiliates and insiders were enhanced. The Dodd-Frank Act also contains reforms of consumer mortgage lending practices and creates a Bureau of Consumer Financial Protection which is granted broad authority over consumer financial practices of banks and others. It is expected as the specific new or incremental requirements applicable to the Corporation become effective that the costs and difficulties of remaining compliant with all such requirements will increase. The Dodd-Frank Act also permanently raises the current standard maximum FDIC deposit insurance amount to $250,000.   On November 9, 2010, the FDIC adopted the final rule that provides temporary unlimited coverage for noninterest-bearing transaction accounts at all FDIC-insured depository institutions (IDIs) in anticipation of the expiration of the Transaction Account Guarantee Program on December 31, 2010. The separate coverage for noninterest-bearing transaction accounts became effective on December 31, 2010, and terminated on December 31, 2012. Unlike the Transaction Account Guarantee Program, the Dodd-Frank Act definition of noninterest-bearing transaction accounts does not include either low-interest Negotiable Order of Withdrawal (NOW) accounts or Interest on Lawyer Trust Accounts (IOLTAs). Since the unlimited coverage on non-interest bearing expired as noted above, all account types (including non-interest bearing) were subject to the FDICs general deposit insurance coverage of $250,000 as of January 1, 2013.   On July 2, 2013, the Federal Reserve Board approved final rules that implement changes to the regulatory capital framework for financial institutions. The new rules include, among other things, the following elements:   <table cellspacing="0" cellpadding="0" style="font: 10pt Calibri, Helvetica, Sans-Serif; width: 100%; border-collapse: collapse"> <tr style="vertical-align: top"> <td style="width: 1%; line-height: 115%"> </td> <td style="width: 99%; padding-left: 24.05pt; text-indent: -0.25in; line-height: 115%">1)      a new regulatory capital component referred to as Common Equity Tier 1 capital, and threshold ratios for this new component;</td></tr> <tr style="vertical-align: top"> <td style="line-height: 115%"> </td> <td style="padding-right: 4.5pt; padding-left: 24.05pt; text-indent: -0.25in; line-height: 115%">2)      a capital conservation buffer above the minimum required level of Common Equity Tier 1 capital, and restrictions on dividend payments, share buybacks, and certain discretionary bonus payments to executive officers if a capital conservation buffer of at least 2.5% of risk-weighted assets is not achieved;</td></tr> <tr style="vertical-align: top"> <td style="line-height: 115%"> </td> <td style="padding-left: 24.05pt; text-indent: -0.25in; line-height: 115%">3)      the inclusion of accumulated other comprehensive income (AOCI) in Tier 1 capital, although banks with less than $250 billion in total assets will be allowed a one-time opt-out from this requirement;</td></tr> <tr style="vertical-align: top"> <td style="line-height: 115%"> </td> <td style="padding-left: 24.05pt; text-indent: -0.25in; line-height: 115%">4)      additional constraints on the inclusion of minority interests, mortgage servicing assets, and deferred tax assets in regulatory capital;</td></tr> <tr style="vertical-align: top"> <td style="line-height: 115%"> </td> <td style="padding-left: 24.05pt; text-indent: -0.25in; line-height: 115%">5)      increased risk-weightings for certain assets, including equity exposures, certain acquisition/development and construction loans, and certain loans that are more than 90-days past due or are on non-accrual status; and</td></tr> <tr style="vertical-align: top"> <td style="line-height: 115%"> </td> <td style="padding-left: 24.05pt; text-indent: -0.25in; line-height: 115%">6)      an increase in minimum required risk-based capital ratios over a phase-in period, and an increase in the threshold for a well-capitalized classification for the Tier 1 Risk-Based Capital Ratio.</td></tr> </table>   These changes will be phased in beginning January 2015, and while management continues to evaluate this final rule and its potential impact, preliminary assessments indicate that the Corporation will continue to exceed all regulatory capital requirements under Basel III.falsefalsefalsenonnum:textBlockItemTypenaRecent Market And Regulatory Developments [Policy Text Block]No definition available.false0Recent Market and Regulatory Developments19false 2us-gaap_NewAccountingPronouncementsPolicyPolicyTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 Recent Accounting Pronouncements   In February 2013, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) 2013-02, "Reporting of Amounts Reclassified out of Accumulated Other Comprehensive Income". ASU 2013-02 requires that companies present either in a single note or parenthetically on the face of the financial statements, the effect of significant amounts reclassified from each component of accumulated other comprehensive income based on its source and the income statement line items affected by the reclassification. The new guidance is effective for interim and annual periods beginning after December 15, 2012. The adoption of this guidance did not have a material effect on the Corporations financial position or results of operations.   In October 2012, the FASB issued ASU 2012-06, Business Combinations (Topic 805): Subsequent Accounting for an Indemnification Asset Recognized at the Acquisition Date as a Result of a Government-Assisted Acquisition of a Financial Institution. ASU 2012-06 clarifies the applicable guidance for subsequently measuring an indemnification asset recognized as a result of a government-assisted acquisition of a financial institution. The standard instructs that when a reporting entity recognizes an indemnification asset, it should subsequently account for the change in the measurement of the indemnification asset on the same basis as the change in the assets subject to indemnification. Any amortization of changes in value should be limited to the contractual term of the indemnification agreement. The amended guidance is effective for interim and annual periods beginning on or after December 15, 2012. The adoption of this guidance did not have a material effect on the Corporations financial position or results of operations.   In October 2012, the FASB issued ASU 2012-04, Technical Corrections and Improvement. It makes conforming amendments related to fair value measurements within the ASC as well as other technical corrections covering a broad range of topics. The amendments in the update that did not have transition guidance were effective upon issuance and the amendments subject to transition guidance are effective for fiscal periods beginning after December 15, 2012, for public entities. The adoption of this guidance did not have a material effect on the Corporations financial position or results of operations.   In July 2012, the FASB issued ASU 2012-02, Intangibles Goodwill and Other; amending ASC Topic 350 to simplify how an entity tests indefinite-lived intangible assets other than goodwill for impairment and to improve consistency in impairment testing guidance among long-lived asset categories. The amendment permits an entity to first assess qualitative factors to determine whether it is more likely than not that an indefinite-lived intangible asset other than goodwill is impaired as a basis for determining whether it is necessary to perform the quantitative impairment test. The amendment is effective for annual and interim impairment tests performed for fiscal years beginning after September 15, 2012. The adoption of this guidance did not have a material effect on the Corporations financial position or results of operations.falsefalsefalsenonnum:textBlockItemTypenaDisclosure of the adoption of new accounting pronouncements that may impact the entity's financial reporting.No definition available.false0Recent Accounting PronouncementsfalseSummary of Significant Accounting Policies (Policies)UnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://sgfc.com/role/SummaryOfSignificantAccountingPoliciesPolicies119