Additional provisions on foreclosed assets.

No definition available.

Name:	SGB_AdditionalProvisionsOnForeclosedAssets
Namespace Prefix:	SGB_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Bank owned life insurance policies stockholders equity percentage.

+ References

No definition available.

+ Details

Name:	SGB_BankOwnedLifeInsurancePoliciesStockholdersEquityPercentage
Namespace Prefix:	SGB_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Foreclosed assets valuation allowance.

+ References

No definition available.

+ Details

Name:	SGB_ForeclosedAssetsValuationAllowance
Namespace Prefix:	SGB_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Threshold limit approved by Federal Reserve Board for financial institutions.

+ References

No definition available.

+ Details

Name:	SGB_ThresholdLimitApprovedByFederalReserveBoardForFinancialInstitutions
Namespace Prefix:	SGB_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 720

-SubTopic 35

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The carrying amount of a life insurance policy on an officer, executive or employee for which the reporting entity (a bank) is entitled to proceeds from the policy upon death of the insured or surrender of the insurance policy.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.10)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 10

-Article 9

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Total Capital divided by risk weighted assets as defined in the regulations.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 505

-Section 50

-Paragraph 1H

-Subparagraph (c)(2)

-URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 505

-Section 50

-Paragraph 1

-Subparagraph (c)(1)

-URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826

+ Details

Name:	us-gaap_CapitalToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

Name:	us-gaap_CashFDICInsuredAmount
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

The amount of cash as of the balance sheet date that is not insured by the Federal Deposit Insurance Corporation.

+ References

No definition available.

+ Details

Name:	us-gaap_CashUninsuredAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Change in carrying amount of the indemnification asset relating to loss sharing agreements with the Federal Deposit Insurance Corporation (FDIC). The change includes for example, but is not limited to, acquisitions, additional estimated losses, disposals, cash payments, accretion of discount and write-offs, net of recoveries.

+ References

No definition available.

+ Details

Name:	us-gaap_FDICIndemnificationAssetPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
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Summary of Significant Accounting Policies (Details Narrative) (USD $)	0 Months Ended	3 Months Ended	9 Months Ended
	Jun. 28, 2013	Sep. 30, 2013	Sep. 30, 2013	Jul. 02, 2013	Jan. 02, 2013	Dec. 31, 2012	Jul. 21, 2010
Maximum FDIC insured amount		$ 250,000	$ 250,000		$ 250,000		$ 250,000
Aggregate uninsured deposits		361,711	361,711
Additional provisions on foreclosed assets			0
Foreclosed asset valuation allowance		895,000	895,000
Bank owned life insurance policies		4,935,135	4,935,135			4,766,513
Bank owned life insurance policies, stockholders equity, percentage		16.00%	16.00%			16.00%
Advertising expense		52,415	127,733
Prepaid asset remaining balance for return FDIC assessments	393,000
Risk weighted assets percentage				2.50%
Threshold limit approved by Federal Reserve Board for financial institutions		$ 250,000,000,000	$ 250,000,000,000
Minimum [Member]
Remaining life of intangible useful life			2 years
Maximum [Member]
Remaining life of intangible useful life			8 years