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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName CORNERCAP GROUP OF FUNDS /VA/
Prospectus Date rr_ProspectusDate Jul. 29, 2012
CornerCap Large/Mid-Cap Value Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading
CornerCap Large/Mid-Cap Value Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The CornerCap Large/Mid-Cap Value Fund’s (the “Large/Mid-Cap Value Fund”) investment objective is long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy and hold shares of the Large/Mid-Cap Value Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (Fees paid directly from your investment)
The Large/Mid-Cap Value Fund does not charge any sales charges or sales loads. If you buy or sell shares indirectly through a financial intermediary instead of directly from the Large/Mid-Cap Value Fund, you may be charged a fee by the financial intermediary.
Operating Expenses Caption [Text] rr_OperatingExpensesCaption ANNUAL FUND OPERATING EXPENSES
(Expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination August 1, 2013
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Large/Mid-Cap Value Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Large/Mid-Cap Value Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Large/Mid-Cap Value Fund’s performance. During the most recent fiscal year, the Large/Mid-Cap Value Fund’s portfolio turnover rate was 35% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 35.00%
Expense Footnotes [Text Block] rr_ExpenseFootnotesTextBlock Subject to certain exceptions, which are described more fully under “REDEMPTION OF FUND SHARES – Redemption Fee,” the Large/Mid-Cap Value Fund charges a 1.00% redemption fee (calculated as a percentage of the amount redeemed) that is applicable to all redemptions (sales or exchanges) made within sixty (60) days of your initial purchase of shares of the Large/Mid-Cap Value Fund.
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees The operating expenses in this fee table may not correlate to the expense ratio in the Large/Mid-Cap Value Fund’s financial statements (or the financial highlights of this prospectus) because the financial statements include only the direct operating expenses incurred by the Large/Mid-Cap Value Fund, not the indirect costs of investing in the Acquired Funds.
Expense Example [Heading] rr_ExpenseExampleHeading EXAMPLE
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock This Example is intended to help you compare the costs of investing in the Large/Mid-Cap Value Fund with the costs of investing in other mutual funds.

The Example assumes that you invest $10,000 in the Large/Mid-Cap Value Fund for the time periods indicated, and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year, and that the Large/Mid-Cap Value Fund’s operating expenses remain the same, and the contractual agreement to limit expenses remains in effect only until August 1, 2013. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Large/Mid-Cap Value Fund’s investment objective is to obtain long-term capital appreciation. To meet its investment objective, the Large/Mid-Cap Value Fund typically invests 80% or more of its net assets in equity securities of U.S. companies.

The Large/Mid-Cap Value Fund invests primarily in U.S. common stocks of large-cap companies (defined by the Adviser as stocks with a market capitalization of at least $5 billion) and of mid-cap companies (defined by the Adviser as stocks with a market capitalization of at least $2 billion, but no more than $5 billion) that the Adviser believes are attractively valued relative to their growth potential, or undervalued in the market. To select stocks and other equity securities for the Large/Mid-Cap Value Fund, the Adviser considers a number of criteria, including, without limitation, relative price/earnings ratio, earnings growth rates and cash flow measurements, as well as diversification and risk.

The Large/Mid-Cap Value Fund may also invest in exchange-traded funds (ETFs) or other investment companies that hold securities in which the Large/Mid-Cap Value Fund may directly invest.

The Large/Mid-Cap Value Fund will sell securities when the Adviser determines that it is advantageous to do so, such as when securities with relatively greater value are available for purchase by the Large/Mid-Cap Value Fund, or to raise cash.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

An investment in the Large/Mid-Cap Value Fund is subject to investment risks, including the risk of losing money on an investment in the Fund. The principal risks of the Large/Mid-Cap Value Fund are:

MARKET RISK:  Stock prices fluctuate in response to many factors, including the activities of individual companies and general market and economic conditions.

EQUITY SECURITY RISK:  The prices of equity securities will fluctuate – sometimes dramatically – over time and the Large/Mid-Cap Value Fund could lose a substantial part, or even all, of its investment in a particular issue. The term equity securities includes common and preferred stock.

BUSINESS AND COMPANY RISK:  Often, a particular industry, or certain companies within that industry, may be affected by circumstances that have little to no impact on other industries or other companies within that industry.

MANAGEMENT RISK:  The specific securities selected by the Large/Mid-Cap Value Fund’s Adviser may perform poorly and may cause the Large/Mid-Cap Value to underperform other mutual funds with similar investment objectives.

MID-CAP COMPANY RISK:  Stocks of mid-cap companies may have more risks than larger companies. In general, mid-cap companies have less experienced management teams, serve smaller markets, and find it more difficult than larger companies to obtain financing for growth or potential development. There is typically a smaller market for the securities of mid-cap companies than for securities of a larger company which may make these securities more susceptible to market downturns and more volatile stock prices.

REGULATORY RISK:  The regulation or deregulation of particular industries may materially impact the value of companies within the affected industry.

UNDERVALUED STOCKS RISK:  Undervalued stocks include stocks that the Adviser believes are undervalued and/or are temporarily out of favor in the market. If these stocks are not undervalued, or they continue to be out of favor in the marketplace, then the Fund will suffer losses.

ETF AND OTHER INVESTMENT COMPANY RISK: To the extent that the Large/Mid-Cap Value Fund’s investments are in ETFs or other investment companies, your cost of investing in the Large/Mid-Cap Value Fund will generally be higher than the cost of investing directly in ETFs or other investment company shares. By investing in the Large/Mid-Cap Value Fund, you will indirectly bear fees and expenses charged by the underlying ETFs and investment companies in which the Large/Mid-Cap Value Fund invests, in addition to the Large/Mid-Cap Value Fund’s direct fees and expenses.

Risk Lose Money [Text] rr_RiskLoseMoney An investment in the Large/Mid-Cap Value Fund is subject to investment risks, including the risk of losing money on an investment in the Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The following bar charts and tables provide an indication of the risks of investing in the Large/Mid-Cap Value Fund by showing changes in the Large/Mid-Cap Value Fund’s performance from year to year and by showing how the Large/Mid-Cap Value Fund’s average annual returns for 1, 5 and 10 years compared to those of a broad-based securities market index. Of course, past performance (before and after taxes) does not necessarily indicate how the Large/Mid-Cap Value Fund will perform in the future. Updated performance information may be found at www.cornercapfunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar charts and tables provide an indication of the risks of investing in the Large/Mid-Cap Value Fund by showing changes in the Large/Mid-Cap Value Fund’s performance from year to year and by showing how the Large/Mid-Cap Value Fund’s average annual returns for 1, 5 and 10 years compared to those of a broad-based securities market index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.cornercapfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Of course, past performance (before and after taxes) does not necessarily indicate how the Large/Mid-Cap Value Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Year-by-year total return as of 12/31 each year (%)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Year to Date Total Return as of June 30, 2012: 1.22%
Best Quarter:                               June 30, 2009                                       27.65%
Worst Quarter:                            September 30, 2002                            (28.78)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Return Table
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the highest historical federal marginal income tax rates and do not reflect the impact of any applicable state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors holding shares through tax-deferred programs such as IRA or 401(k) plans.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock Return After Taxes is shown to illustrate the effect of federal taxes on Large/Mid-Cap Value Fund returns. Actual after-tax returns depend on each investor’s personal tax situation, and are likely to differ from those shown. After-tax returns are calculated using the highest historical federal marginal income tax rates and do not reflect the impact of any applicable state and local taxes. After-tax returns shown are not relevant to investors holding shares through tax-deferred programs such as IRA or 401(k) plans.

For periods ended December 31, 2011
CornerCap Large/Mid-Cap Value Fund | CornerCap Large/Mid-Cap Value Fund
  
Risk/Return: rr_RiskReturnAbstract  
Redemption Fee rr_RedemptionFeeOverRedemption 1.00%
Management Fees rr_ManagementFeesOverAssets 1.00%
Distribution and/or Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.50%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.51%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.30%) [2]
Annual Fund Operating Expenses and Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.21% [1],[2]
1 Year rr_ExpenseExampleYear01 123
3 Years rr_ExpenseExampleYear03 448
5 Years rr_ExpenseExampleYear05 795
10 Years rr_ExpenseExampleYear10 1,774
2002 rr_AnnualReturn2002 (40.15%)
2003 rr_AnnualReturn2003 42.09%
2004 rr_AnnualReturn2004 28.35%
2005 rr_AnnualReturn2005 1.75%
2006 rr_AnnualReturn2006 16.96%
2007 rr_AnnualReturn2007 (1.78%)
2008 rr_AnnualReturn2008 (42.31%)
2009 rr_AnnualReturn2009 41.23%
2010 rr_AnnualReturn2010 14.01%
2011 rr_AnnualReturn2011 (4.90%)
Year to Date Return, Label rr_YearToDateReturnLabel Year to Date Total Return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2012
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 1.22%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 27.65%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2002
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (28.78%)
1 Year rr_AverageAnnualReturnYear01 (4.90%)
5 Years rr_AverageAnnualReturnYear05 (2.80%)
10 Years rr_AverageAnnualReturnYear10 1.20%
Since Inception rr_AverageAnnualReturnSinceInception (0.58%)
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 27, 2000
CornerCap Large/Mid-Cap Value Fund | Return After Taxes on Distributions | CornerCap Large/Mid-Cap Value Fund
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (5.04%)
5 Years rr_AverageAnnualReturnYear05 (3.18%)
10 Years rr_AverageAnnualReturnYear10 0.97%
Since Inception rr_AverageAnnualReturnSinceInception (1.06%)
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 27, 2000
CornerCap Large/Mid-Cap Value Fund | Return After Taxes on Distributions and Sale of Fund Shares | CornerCap Large/Mid-Cap Value Fund
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (3.04%)
5 Years rr_AverageAnnualReturnYear05 (2.32%)
10 Years rr_AverageAnnualReturnYear10 1.03%
Since Inception rr_AverageAnnualReturnSinceInception (0.58%)
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 27, 2000
CornerCap Large/Mid-Cap Value Fund | S&P 500 Index Reflects no deduction for sales charges, commissions, expenses or taxes.
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.11%
5 Years rr_AverageAnnualReturnYear05 (0.25%)
10 Years rr_AverageAnnualReturnYear10 2.92%
Since Inception rr_AverageAnnualReturnSinceInception 0.75%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 27, 2000
CornerCap Large/Mid-Cap Value Fund | Russell 1000 Value Index Reflects no deduction for sales charges, commissions, expenses or taxes.
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.39%
5 Years rr_AverageAnnualReturnYear05 (2.64%)
10 Years rr_AverageAnnualReturnYear10 3.89%
Since Inception rr_AverageAnnualReturnSinceInception 3.77%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 27, 2000
CornerCap Large/Mid-Cap Value Fund | Russell 3000 Index Reflects no deduction for sales charges, commissions, expenses or taxes.
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.03%
5 Years rr_AverageAnnualReturnYear05 (0.01%)
10 Years rr_AverageAnnualReturnYear10 3.51%
Since Inception rr_AverageAnnualReturnSinceInception 1.36%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 27, 2000
CornerCap Large/Mid-Cap Value Fund | Russell 3000 Value Index Reflects no deduction for sales charges, commissions, expenses or taxes.
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 (0.10%)
5 Years rr_AverageAnnualReturnYear05 (2.58%)
10 Years rr_AverageAnnualReturnYear10 4.08%
Since Inception rr_AverageAnnualReturnSinceInception 4.07%
Inception Date rr_AverageAnnualReturnInceptionDate Jul. 27, 2000
[1] The Large/Mid-Cap Value Fund bears a pro rata share of the fees and expenses of the other funds in which Large/Mid-Cap Value Fund invests (Acquired Funds). The operating expenses in this fee table may not correlate to the expense ratio in the Large/Mid-Cap Value Fund's financial statements (or the financial highlights of this prospectus) because the financial statements include only the direct operating expenses incurred by the Large/Mid-Cap Value Fund, not the indirect costs of investing in the Acquired Funds.
[2] The Adviser has contractually agreed to waive fees and reimburse the Large/Mid-Cap Value Fund for "Total Annual Fund Operating Expenses" (exclusive of interest, taxes, brokerage fees and commissions, acquired fund fees and expenses, and extraordinary expenses) that exceed 1.20%. The contractual agreement cannot be terminated prior to August 1, 2013 without the Board of Trustees' approval.