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  <rr:ProspectusDate contextRef="Duration_02May2014_01May2015">2015-05-01</rr:ProspectusDate>
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  <dei:EntityRegistrantName contextRef="Duration_02May2014_01May2015">PENN SERIES FUNDS INC</dei:EntityRegistrantName>
  <dei:EntityCentralIndexKey contextRef="Duration_02May2014_01May2015">0000702340</dei:EntityCentralIndexKey>
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  <dei:DocumentCreationDate contextRef="Duration_02May2014_01May2015">2015-04-30</dei:DocumentCreationDate>
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  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000006722_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006722_Member">The Fund will invest in a diversified portfolio of high-quality money market instruments, which are rated within the two highest credit categories assigned by recognized rating organizations or, if not rated, are of comparable investment quality as determined by Penn Mutual Asset Management, Inc. ("PMAM" or the "Adviser"). Investments include commercial paper, U.S. Treasury securities, bank certificates of deposit and repurchase agreements. The Adviser seeks to invest in money market instruments that present minimal credit risks. Important factors in selecting investments include a company's profitability, ability to generate funds, capital adequacy, and liquidity of the investment. The Fund will invest only in securities that mature in 397 days or less, as calculated in accordance with applicable law. The Fund's policy is to seek to maintain a stable price of $1.00 per share.</rr:StrategyNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000006722_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesMoneyMarketFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000006722_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesMoneyMarketFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000006722_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesMoneyMarketFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000006722_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesMoneyMarketFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000006722_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;MONEY MARKET FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000006722_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000006722_Member">The Money Market Fund (the &amp;#8220;Fund&amp;#8221;) seeks to preserve capital and achieve the highest income consistent with high liquidity.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000006722_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006722_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable annuity contract or variable life insurance policy (each, a &amp;#8220;variable contract&amp;#8221;) level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000006722_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006722_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000006722_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000006722_Member">&lt;b&gt;Principal Risks of Investing &lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006722_Member">&lt;b&gt;Counterparty Risk.&lt;/b&gt; &amp;nbsp;The possibility that a party to a transaction involving the Fund may fail to meet its obligations thereby causing the Fund to lose money or the benefit of the transaction or preventing the Fund from selling or buying other securities to implement its investment strategies. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Credit Risk.&lt;/b&gt;  &amp;nbsp;The possibility that an issuer of a debt security held by the Fund defaults on its payment obligations. While the Fund tries to minimize this risk by investing in high-quality securities, the credit quality of such securities may change rapidly in certain market environments and in response to certain market events, such as a decline in the credit quality of an issuer. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Interest Rate Risk.&lt;/b&gt;  &amp;nbsp;The possibility that the prices of the Fund&amp;#8217;s fixed income investments will decline due to rising interest rates. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Investment Risk.&lt;/b&gt;  &amp;nbsp;You may lose money by investing in the Fund. Although the Fund seeks to preserve the value of your investment at $1.00 per share, there is no guarantee that the Fund will be able to do so. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt;  &amp;nbsp;The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;New Regulatory Risk.&lt;/b&gt;  &amp;nbsp;In July 2014, the SEC adopted money market fund reform intended to address potential systemic risks associated with money market funds and to improve transparency for money market fund investors. In an effort to comply with the new requirements, the Fund may take certain steps that will impact its investment strategy, which could impact the return potential of the Fund. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Redemption Risk.&lt;/b&gt;  &amp;nbsp;The possibility that large redemptions may cause the Fund to sell its securities at inopportune times resulting in a loss to the Fund. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;U.S. Government Securities Risk.&lt;/b&gt;  &amp;nbsp;The possibility that the U.S. government will not provide financial assistance in support of securities issued by certain of its agencies and instrumentalities and held by the Fund if it is not obligated to do because such securities are not issued or guaranteed by the U.S. Treasury. A default by a U.S. government agency or instrumentality could cause the Fund&amp;#8217;s share price or yield to fall.</rr:RiskNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006722_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006722_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower. The current yield of the Money Market Fund for the seven-day period ended December 31, 2014 was 0.01%.</rr:PerformanceNarrativeTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006722_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000006722_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;1.25%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;0.00%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;9/30/2007&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;12/31/2009&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="INF" unitRef="USD">62</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="INF" unitRef="USD">195</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="INF" unitRef="USD">340</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="INF" unitRef="USD">762</rr:ExpenseExampleYear10>
  <rr:ExpensesRestatedToReflectCurrent contextRef="Duration_02May2014_01May2015S000006722_Member">The expense information in the table has been restated to reflect an increase in the Fund&amp;#8217;s Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</rr:ExpensesRestatedToReflectCurrent>
  <rr:RiskMoneyMarketFund contextRef="Duration_02May2014_01May2015S000006722_Member">Although the Fund seeks to preserve the value of your investment at $1.00 per share, there is no guarantee that the Fund will be able to do so.</rr:RiskMoneyMarketFund>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000006722_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000006722_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000006722_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member">2007-09-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member">2009-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:MoneyMarketSevenDayYieldCaption contextRef="Duration_02May2014_01May2015S000006722_Member">The current yield of the Money Market Fund for the seven-day period ended December 31, 2014 was 0.01%.</rr:MoneyMarketSevenDayYieldCaption>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000006726_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000006726_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006726_Member">Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in equity securities of mid-cap companies. For purposes of this policy, mid capitalization companies have market capitalizations that fall within the market capitalization range of companies in the Russell Midcap&lt;sup&gt;&amp;#174;&lt;/sup&gt; Index at the time of purchase (as of March 31, 2015, this range was between $212 million and $37.33 billion). Because the Fund's definition of mid-cap companies is dynamic, the lower and upper limits on market capitalization will change with the markets. In selecting individual securities, the Sub-Adviser uses bottom-up, fundamental research to identify high quality companies that are trading at a substantial discount to their intrinsic value, defined as the Sub-Adviser's estimate of a company's true long-term economic worth, where there is a strategic plan or event that is expected to both enhance value and narrow the value/price gap. Intrinsic value reflects the Sub-Adviser's analysis and estimates. There is no guarantee that any intrinsic value will be realized; security prices may decrease regardless of intrinsic values. Applying a consistent, private equity-style investment framework, the Sub-Adviser focuses its research efforts on a company's long-term outlook and strategic catalysts that can potentially unlock value. Their approach emphasizes asset values and cash flows, directly engaging a company's management team to evaluate its strategic direction, execution abilities and direct incentive compensation.&lt;br /&gt;&lt;br /&gt;The Sub-Adviser will consider reducing or eliminating a position when the gap between its price and its intrinsic value has narrowed or been eliminated or when other opportunities appear more attractive. Changes in management or corporate strategy may also result in the reduction or elimination of a position. The Sub-Adviser does not have an automatic sell decision when a holding increases to a certain market capitalization level based on underperformance. They would continue to hold a stock if they believed that it could ultimately contribute to performance.</rr:StrategyNarrativeTextBlock>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000006726_Member">&lt;b&gt;FUND SUMMARY:&amp;nbsp; MID CAP VALUE FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000006726_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000006723_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000006723_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006723_Member">Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in short- to intermediate-term investment grade debt securities of U.S. government and corporate issuers, including mortgage-backed and asset-backed securities. Investment grade debt securities are those securities rated BBB- or higher by S&amp;amp;P, Baa3 or higher by Moody's, or the equivalent by any other nationally recognized statistical rating organization ("NRSRO"), or if unrated, determined by the Adviser to be of comparable quality. The remaining assets are generally invested in other securities, including high yield securities ( "junk bonds") rated below investment grade by a NRSRO, or, if unrated, determined by the Adviser to be below investment grade, preferred and convertible securities, closed-end funds, exchange traded funds, money market securities or equities. While most assets will typically be invested in U.S. dollar-denominated bonds, the Fund may also invest in debt securities of foreign issuers, securities that are economically tied to emerging markets, and securities denominated in foreign currencies. The Fund may invest in derivative instruments, such as options, futures contracts, swap agreements, mortgage dollar rolls or forward commitments in keeping with the Fund's objective.&lt;br /&gt;&lt;br /&gt;The Adviser follows an actively managed, total-return oriented approach and seeks to invest in securities that are under-valued in the marketplace based on both a relative value analysis of individual securities combined with an analysis of macro-economic factors. The Adviser will purchase an individual security when doing so is also consistent with its macro-economic outlook, including its forecast of interest rates and its analysis of the yield curve (a measure of interest rates of securities with the same quality, but different maturities). The Adviser will seek to opportunistically purchase securities to take advantage of inefficiencies of prices in the securities markets, and will sell a security when it believes that the security has been fully priced. The Adviser seeks to reduce credit risk by diversifying among many issuers and different types of securities.&lt;br /&gt;&lt;br /&gt;The average duration of this Fund normally varies within one year (plus or minus) of the duration of the Barclays U.S. Government/Credit 1- 3 Year Index, as calculated by the Adviser. The average duration of the Barclays U.S. Government/Credit 1- 3 Year Index, as of March 31, 2015, was 1.82 years. Duration measures the sensitivity of a debt security to changes in interest rates. Generally, the longer the maturity or duration of a fixed income security (or fixed income portfolio), the more sensitive it will be to interest rate changes.&lt;br /&gt;&lt;br /&gt;The Adviser will look for inefficiencies in the market and sell when it feels a security is fully priced. As a result, portfolio turnover can be expected to be relatively high, which may result in increased transaction costs, such as commissions, and may lower fund performance.</rr:StrategyNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000006723_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesLimitedMaturityBondFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
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  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000006726_Member">The investment objective of the Mid Cap Value Fund (the &amp;#8220;Fund&amp;#8221;) is to achieve growth of capital.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000006726_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006726_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000006726_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000006724_Member">&lt;b&gt;Example&lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000006724_Member">&lt;b&gt;Portfolio Turnover&lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006724_Member">Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in securities listed in the S&amp;amp;P 500&lt;sup&gt;&amp;#174;&lt;/sup&gt; Index (the "Index"). Under normal circumstances, however, the Fund intends to invest substantially all of its assets in securities of companies included in the Index and close substitutes (such as index futures contracts) that are designed to track the Index. The Index is a well-known stock market index that includes common stocks of approximately 500 companies from all major industries representing a significant portion of the market value of all common stocks publicly traded in the United States, most of which are listed on the New York Stock Exchange. Stocks in the Index are weighted according to their float adjusted capitalizations. The Fund may concentrate (invest 25% or more of the value of its assets) in the securities of issuers having their principal business activities in the same industry if the Index is also concentrated in such industry.&lt;br /&gt;&lt;br /&gt;The Sub-Adviser does not manage the Fund according to traditional methods of "active" investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment. Instead, the Sub-Adviser utilizes a "passive" investment approach, attempting to replicate the investment performance of the Index through automated statistical analytic procedures.&lt;br /&gt;&lt;br /&gt;The Sub-Adviser seeks to replicate the returns of the Index by investing in the securities of the Index in approximately their Index weight. However, under various circumstances, it may not be possible or practicable to purchase all of those securities in those weightings. In those circumstances, the Fund may purchase a sample of stocks in the Index in proportions expected to replicate generally the performance of the Index as a whole. In addition, from time to time, stocks are added to or removed from the Index. The Fund may sell stocks that are represented in the Index, or purchase stocks that are not yet represented in the Index, in anticipation of their removal from or addition to the Index.&lt;br /&gt;&lt;br /&gt;The Sub-Adviser may at times purchase or sell futures contracts in lieu of investment directly in the stocks making up the Index. The Sub-Adviser might do so, for example, in order to increase the Fund's investment exposure pending investment of cash in the stocks comprising the Index. Alternatively, the Sub-Adviser might use futures to reduce its investment exposure to the Index in situations where it intends to sell a portion of the stocks in the Fund's portfolio but the sale has not yet been completed.</rr:StrategyNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000006724_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesIndex500Fund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000006724_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesIndex500Fund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000006724_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesIndex500FundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000006724_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesIndex500Fund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006726_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="INF" unitRef="USD">83</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="INF" unitRef="USD">259</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="INF" unitRef="USD">450</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="INF" unitRef="USD">1002</rr:ExpenseExampleYear10>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000006724_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;INDEX 500 FUND&lt;/b&gt;</rr:RiskReturnHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000006726_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 32% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000006726_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000006726_Member">&lt;b&gt;Principal Risks of Investing &lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006726_Member">&lt;b&gt;Liquidity Risk.&lt;/b&gt;&amp;nbsp; The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Management Risk.&amp;nbsp; &lt;/b&gt;The possibility that the investment decisions, techniques, analyses or models implemented by the Fund&amp;#8217;s Sub-Adviser in seeking to achieve the Fund&amp;#8217;s investment objective may not produce the returns expected, may cause the Fund&amp;#8217;s shares to lose value or may cause the Fund to underperform relevant benchmarks or other funds with similar investment objectives. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt;&amp;nbsp; The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Mid-Cap Securities Risk.&lt;/b&gt;&amp;nbsp; The possibility that the return on the Fund&amp;#8217;s investments in mid-cap companies may be less than the return on investments in stocks of larger or smaller companies or the stock market as a whole. Mid-cap companies may be more vulnerable to market volatility and adverse business or economic events than larger, more established companies. The securities of mid-cap companies are more likely to trade in lower volumes and are generally subject to greater and less predictable price changes than the securities of larger capitalization companies. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;&amp;#8220;Value&amp;#8221; Investing Risk.&amp;nbsp; &lt;/b&gt;The possibility that the Fund&amp;#8217;s investments in securities believed by the Sub-Adviser to be undervalued may not realize their perceived value for extended periods of time or may never realize their perceived value. The securities in which the Fund invests may respond differently to market and other developments than other types of securities, and may underperform growth stocks and/or the market as a whole. &lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of investing in mid-cap stocks in the hope of achieving above-average growth of capital.</rr:RiskNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006726_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006726_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000006726_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;25.30%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-28.74%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;9/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;12/31/2008&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006726_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000006724_Member">&lt;b&gt;Investment Objective&lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000006724_Member">The investment objective of the Index 500 Fund (the &amp;#8220;Fund&amp;#8221;) is to seek a total return (capital appreciation and income) which corresponds to that of the S&amp;amp;P 500 Index.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000006724_Member">&lt;b&gt;Fund Fees and Expenses&lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006724_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000006724_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006724_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="INF" unitRef="USD">40</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="INF" unitRef="USD">125</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="INF" unitRef="USD">219</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="INF" unitRef="USD">493</rr:ExpenseExampleYear10>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000006724_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 3% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000006724_Member">&lt;b&gt;Principal Investment Strategy&lt;/b&gt;</rr:StrategyHeading>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000006724_Member">&lt;b&gt;Principal Risks of Investing&lt;/b&gt;</rr:RiskHeading>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000006726_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund's average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000006726_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006724_Member">&lt;b&gt;Concentration Risk.&lt;/b&gt; &amp;nbsp;The possibility that, to the extent the Fund invests to a significant extent in a particular industry or group of industries within a particular sector, the Fund may be subject to greater risks than if its investments were broadly diversified across industries and sectors. The Fund also is subject to loss due to adverse occurrences that may affect that industry or group of industries.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Derivatives Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s use of derivatives, such as futures, options and swap agreements, may lead to losses, including those magnified by leverage, particularly when derivatives are used to enhance return rather than mitigate risk. Certain derivative instruments may be difficult to sell when the Sub-Adviser believes it would be appropriate to do so, difficult to value if the instrument becomes illiquid, or the other party to a derivative contract may be unwilling or unable to fulfill its contractual obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Large-Cap Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in larger companies may underperform relative to those of smaller companies. Larger more established companies may be unable to respond quickly to new competitive challenges such as changes in technology and consumer tastes and may not be able to attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt; &amp;nbsp;The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt; &amp;nbsp;The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Passive Investment Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s return may be lower than the return of an actively managed fund because the Fund holds shares of a security based on the holdings of its benchmark index, not the current or projected performance of a security, industry or sector. The Fund does not take defensive positions under any market conditions, including declining markets.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Sampling Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund may not hold all of the securities included in its benchmark index and that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the Fund&amp;#8217;s benchmark index.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Tracking Error Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s performance may deviate from that of the benchmark index it seeks to track. This risk may be heightened during times of increased market volatility or other unusual market conditions.&lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of investing in common stocks in the hope of achieving a total return which corresponds to that of the Index.</rr:RiskNarrativeTextBlock>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000006726_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member">2009-09-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006724_Member">&lt;b&gt;Performance Information&lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006724_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. They represent the performance of the Fund&amp;#8217;s previous managers for the period prior to August 25, 2008. Since August 25, 2008, SSGA Funds Management, Inc. has been responsible for the Fund&amp;#8217;s day-to-day portfolio management. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000006724_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;15.74%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-21.85%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;6/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;12/31/2008&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006724_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000006726_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesMidCapValueFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000006726_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesMidCapValueFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000006726_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesMidCapValueFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000006726_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesMidCapValueFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000022085_Member">&lt;b&gt;FUND SUMMARY:&amp;nbsp; LARGE CORE GROWTH FUND&lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000022085_Member">&lt;b&gt;Investment Objective&lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000022085_Member">The investment objective of the Large Core Growth Fund (the &amp;#8220;Fund&amp;#8221;) is to seek to achieve long-term growth of capital (capital appreciation).</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000006728_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000006728_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006728_Member">Under normal market conditions, the Fund invests at least 80% of its net assets in equity securities of medium capitalization companies. For purposes of the Fund's investments, equity securities include common stock, preferred stock, and equity-equivalent securities, such as convertible securities, stock futures contracts or stock index futures contracts. The Sub-Adviser considers medium size companies whose market capitalization at the time of purchase is within the capitalization range of the Russell 3000&lt;sup&gt;&amp;#174;&lt;/sup&gt; Index, excluding the largest 100 such companies, for inclusion in the Fund's portfolio. The Sub-Adviser intends to manage the Fund so that its weighted capitalization falls within the capitalization range of the members of the Russell Midcap&lt;sup&gt;&amp;#174;&lt;/sup&gt; Index. As of March 31, 2015, this capitalization range was between $211 million and $39.1 billion. In selecting stocks for the Fund, the Sub-Adviser looks for companies whose stock price may not reflect the company's value. The Sub-Adviser attempts to purchase the stocks of these undervalued companies and hold each stock until the price has increased to, or is higher than, a level the Sub-Adviser believes more accurately reflects the fair value of the company. The Fund may invest a portion of its assets in foreign securities when these securities meet the Sub-Adviser's standards of selection. The Sub-Adviser may sell stocks from the Fund's portfolio if it believes a stock no longer meets its valuation criteria, a stock's risk parameters outweigh its return opportunity, more attractive alternatives are identified or specific events alter a stock's prospects. The Fund may engage in active and frequent trading of portfolio securities in the pursuit of its investment objective.</rr:StrategyNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000006728_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesMidCoreValueFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000006728_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesMidCoreValueFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000006728_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesMidCoreValueFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000006728_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesMidCoreValueFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000006728_Member">&lt;b&gt;FUND SUMMARY:&amp;nbsp; MID CORE VALUE FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000006728_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000006728_Member">The investment objective of the Mid Core Value Fund (the &amp;#8220;Fund&amp;#8221;) is to achieve capital appreciation.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000006728_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006728_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000006728_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006728_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000006728_MemberC000018291_Member" decimals="INF" unitRef="USD">108</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000006728_MemberC000018291_Member" decimals="INF" unitRef="USD">337</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000006728_MemberC000018291_Member" decimals="INF" unitRef="USD">585</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000006728_MemberC000018291_Member" decimals="INF" unitRef="USD">1294</rr:ExpenseExampleYear10>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000006728_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 69% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000006728_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000006723_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;LIMITED MATURITY BOND FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000006723_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000006723_Member">The Limited Maturity Bond Fund (the &amp;#8220;Fund&amp;#8221;) seeks to maximize total return consistent with preservation of capital.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000006723_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006723_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000006723_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000006728_Member">&lt;b&gt;Principal Risks of Investing &lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006728_Member">&lt;b&gt;Foreign Investment Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;IPOs Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s performance may be affected by the purchase of securities issued in initial public offerings (IPOs) that have little to no trading history, limited issuer information, increased volatility and may not be available to the extent desired. The prices of securities bought in IPOs may rise and fall rapidly, often because of investor perceptions rather than economic reasons. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt;&amp;nbsp; The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt;&amp;nbsp; The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Mid-Cap Securities Risk.&lt;/b&gt;&amp;nbsp; The possibility that the return on the Fund&amp;#8217;s investments in mid-cap companies may be less than the return on investments in stocks of larger or smaller companies or the stock market as a whole. Mid-cap companies may be more vulnerable to market volatility and adverse business or economic events than larger, more established companies. The securities of mid-cap companies are more likely to trade in lower volumes and are generally subject to greater and less predictable price changes than the securities of larger capitalization companies. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Portfolio Turnover Risk&lt;/b&gt;&lt;b&gt;.&lt;/b&gt;&amp;nbsp; The possibility that the Fund may frequently buy and sell portfolio securities, which may increase transaction costs to the Fund and cause the Fund&amp;#8217;s performance to be less than you expect. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;&amp;#8220;Value&amp;#8221; Investing Risk.&amp;nbsp; &lt;/b&gt;The possibility that the Fund&amp;#8217;s investments in securities believed by the Sub-Adviser to be undervalued may not realize their perceived value for extended periods of time or may never realize their perceived value. The securities in which the Fund invests may respond differently to market and other developments than other types of securities, and may underperform growth stocks and/or the market as a whole. &lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of investing in mid-cap stocks in the hope of achieving above-average growth of capital.</rr:RiskNarrativeTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000022085_Member">&lt;b&gt;Fund Fees and Expenses&lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022085_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000006730_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000006730_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006730_Member">Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in marketable investment grade debt securities, which are those securities rated BBB- or higher by S&amp;amp;P, Baa3 or higher by Moody's, or the equivalent by any other nationally recognized statistical rating organization ("NRSRO"), or, if unrated, determined by the Adviser to be of comparably quality. The remaining assets are generally invested in other securities, including high yield securities ("junk bonds") rated below investment grade by a NRSRO, or, if unrated, determined by the Adviser to be below investment grade, preferred and convertible securities, closed-end funds, exchange traded funds, money market securities or equities. While most assets will typically be invested in U.S. dollar-denominated bonds, the Fund may also invest in debt securities of foreign issuers, securities that are economically tied to emerging markets, and securities denominated in foreign currencies. The Fund may invest in derivative instruments, such as options, futures contracts, swap agreements, mortgage dollar rolls or forward commitments in keeping with the Fund's objective.&lt;br /&gt;&lt;br /&gt;The Adviser follows an actively managed, total-return oriented approach and seeks to find securities that are under-valued in the marketplace based on both a relative value analysis of individual securities combined with an analysis of macro-economic factors. With this approach, the Adviser attempts to identify securities that are under-valued based on their quality, maturity, and sector in the marketplace. The Adviser will purchase an individual security when doing so is also consistent with its macro-economic outlook, including its forecast of interest rates and its analysis of the yield curve (a measure of interest rates of securities with the same quality, but different maturities). In addition, the Adviser will seek to opportunistically purchase securities to take advantage of inefficiencies of prices in the securities markets. The Adviser will sell a security when it believes that the security has been fully priced. The Adviser seeks to reduce credit risk by diversifying among many issuers and different types of securities.&lt;br /&gt;&lt;br /&gt;The average portfolio duration of this Fund normally varies within two years (plus or minus) of the duration of the Barclays U.S. Aggregate Index, as calculated by the Adviser. The average duration of the Barclays U.S. Aggregate Index, as of March 31, 2015, was 5.34 years. Duration is a measure used to determine the sensitivity of a debt security to changes in interest rates. Generally, the longer the maturity or duration of a fixed income security (or fixed income portfolio), the more sensitive it will be to interest rate changes.</rr:StrategyNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000006730_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesQualityBondFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000006730_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesQualityBondFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000006730_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesQualityBondFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000006730_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesQualityBondFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000022085_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000022085_Member">&lt;b&gt;Example&lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022085_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000022085_Member">&lt;b&gt;Portfolio Turnover&lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000022085_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 83% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000022085_Member">&lt;b&gt;Principal Investment Strategy&lt;/b&gt;</rr:StrategyHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022085_Member">The Fund attempts to achieve its investment objective by investing primarily in common and preferred stocks of large capitalization U.S. companies. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in securities of large capitalization companies. For purposes of this policy, large capitalization companies have market capitalizations that fall within the market capitalization range of companies in the Russell 1000&lt;b&gt;&lt;sup&gt;&amp;#174;&lt;/sup&gt;&lt;/b&gt; Growth Index at the time of purchase (as of March 31, 2015, this range was between $212.3 million and $725 billion). Because the Fund&amp;#8217;s definition of large capitalization companies is dynamic, the lower and upper limits on market capitalization will change with the markets.&lt;br /&gt;&lt;br /&gt;The Fund invests principally in equity securities of large capitalization companies that offer the potential for capital growth, with an emphasis on identifying companies that have the prospect for improving sales and earnings growth rates, enjoy a competitive advantage and have effective management with a history of making investments that are in the best interests of shareholders. The Sub-Adviser employs a rigorous bottom-up research process to identify solid investment opportunities. The Sub-Adviser seeks to construct a well diversified portfolio in order to reduce risk while enhancing return.&lt;br /&gt;&lt;br /&gt;The Sub-Adviser may sell a security based on several factors, with valuation the key element. The Sub-Adviser may sell a security if the investment reaches its target price, there is a change in the security&amp;#8217;s fundamentals or when better investment opportunities emerge.&lt;br /&gt;&lt;br /&gt;The Fund may also invest in U.S. dollar-denominated and U.S. exchange-traded foreign equities, American Depositary Receipts (&amp;#8220;ADRs&amp;#8221;), real estate investment trusts (&amp;#8220;REITs&amp;#8221;), shares of other investment companies and exchange-traded funds (&amp;#8220;ETFs&amp;#8221;), and cash instruments maturing in one year or less.&lt;br /&gt;&lt;br /&gt;The Fund may buy and sell portfolio securities actively. If it does, its portfolio turnover rate and transaction costs will rise, which may lower fund performance.</rr:StrategyNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000022085_Member">&lt;b&gt;Principal Risks of Investing&lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022085_Member">&lt;b&gt;Currency Risk.&lt;/b&gt;&amp;nbsp; The possibility that the value of the Fund&amp;#8217;s assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and restrictions or prohibitions on the repatriation of foreign currencies.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Depositary Receipt Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s investments in foreign companies through depositary receipts will expose the Fund to the same risks as direct investment in securities of foreign issuers. In addition, investments in ADRs may be less liquid than the underlying shares in their primary trading market, and the value of securities underlying ADRs may change materially at times when U.S. markets are not open for trading.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;&amp;#8220;Growth&amp;#8221; Investing Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s investments in securities of companies perceived to be &amp;#8220;growth&amp;#8221; companies may underperform when value investing is in favor and may be more volatile than other securities because they are more sensitive to investor perceptions of the issuing company&amp;#8217;s growth of earnings potential. Also, because growth companies usually invest a high portion of earnings in their businesses, growth stocks may lack the dividends of some value stocks that can cushion stock prices in a falling market.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Large-Cap Securities Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s investments in larger companies may underperform relative to those of smaller companies. Larger more established companies may be unable to respond quickly to new competitive challenges such as changes in technology and consumer tastes and may not be able to attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt;&amp;nbsp; The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt;&amp;nbsp; The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Other Investment Company Risk.&lt;/b&gt;&amp;nbsp; The possibility that investments by the Fund in shares of other investment companies will subject the Fund to the risks associated with those investment companies. Fund shareholders will also indirectly bear a proportionate share of any underlying investment company&amp;#8217;s fees and expenses in addition to paying the Fund&amp;#8217;s expenses.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Portfolio Turnover Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund may frequently buy and sell portfolio securities, which may increase transaction costs to the Fund and cause the Fund&amp;#8217;s performance to be less than you expect.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;REITs Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s investments in REITs will subject the Fund to the risks associated with the direct ownership of real estate, including fluctuations in the value of underlying properties, changes in interest rates and risks related to general or local economic conditions. REITs are dependent upon management skills and generally may not be diversified. REITs are also subject to heavy cash flow dependency, defaults by borrowers or tenants and self-liquidation.&lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of investing in common and preferred stocks in the hope of achieving long-term growth of capital.</rr:RiskNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022085_Member">&lt;b&gt;Performance Information&lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022085_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000022085_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;18.51%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-17.53%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;3/31/2012&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;9/30/2011&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006728_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022085_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006728_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. They represent the performance of the Fund&amp;#8217;s previous managers for the period prior to May 1, 2013. Since May 1, 2013, American Century Investment Management, Inc. has been responsible for the Fund&amp;#8217;s day-to-day portfolio management. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:ExpensesRestatedToReflectCurrent contextRef="Duration_02May2014_01May2015S000006724_Member">The expense information in the table has been restated to reflect an increase in the Fund's Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</rr:ExpensesRestatedToReflectCurrent>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000006728_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;18.69%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-22.12%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;9/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;9/30/2011&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006728_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000006734_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesFlexiblyManagedFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000006734_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesFlexiblyManagedFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000006734_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesFlexiblyManagedFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000006734_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesFlexiblyManagedFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006723_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000006723_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 82% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000006723_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000006723_Member">&lt;b&gt;Principal Risks of Investing &lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006723_Member">&lt;b&gt;Call Risk.&lt;/b&gt; &amp;nbsp;The possibility that, during periods of falling interest rates, an issuer may redeem a security by repaying it early, which may reduce the Fund&amp;#8217;s income if the proceeds are reinvested at lower interest rates. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Convertible Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the value of the Fund&amp;#8217;s investments in convertible securities may be adversely affected by changes in interest rates, the credit of the issuer and the value of the underlying common stock. The market values of convertible securities tend to decline as interest rates increase and, conversely, to increase as interest rates decline. In addition, as the market price of the underlying common stock declines below the conversion price, the price of the convertible security tends to be increasingly influenced by the yield of the convertible security. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Corporate Debt Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the issuer of a debt security held by the Fund is unable to meet its principal and interest payment obligations. The further possibility that corporate debt securities held by the Fund may experience increased price volatility due to such factors as market interest rates, market perception of the creditworthiness of the issuer and general market liquidity. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Credit Risk.&lt;/b&gt; &amp;nbsp;The possibility that an issuer of a debt security, or the counterparty to a derivatives contract, held by the Fund defaults on its payment obligations. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Currency Risk.&lt;/b&gt; &amp;nbsp;The possibility that the value of the Fund&amp;#8217;s assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and restrictions or prohibitions on the repatriation of foreign currencies. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Derivatives Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s use of derivatives, such as futures, options and swap agreements, may lead to losses, including those magnified by leverage, particularly when derivatives are used to enhance return rather than mitigate risk. Certain derivative instruments may be difficult to sell when the Sub-Adviser believes it would be appropriate to do so, difficult to value if the instrument becomes illiquid, or the other party to a derivative contract may be unwilling or unable to fulfill its contractual obligations. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Emerging Markets Risk.&lt;/b&gt; &amp;nbsp;The possibility that the stocks of companies located in emerging markets may be more volatile, and less liquid, than the stocks of companies located in the U.S. and developed foreign markets due to political, economic, or regulatory conditions within emerging market countries. In addition, emerging market countries may experience more volatile interest and currency exchange rates, higher levels of inflation and less efficient trading and settlement systems. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Fixed Income Market Risk.&lt;/b&gt; &amp;nbsp;The possibility that the market value of a fixed-income security may decline due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic conditions, changes in the outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. Fixed income securities markets may, in response to governmental intervention, economic or market developments (including potentially a reduction in the number of broker-dealers willing to engage in market-making activity), or other factors, experience periods of increased, and sometimes unpredictable, volatility and reduced liquidity. During those periods, the Fund may experience increased levels of shareholder redemptions, and may have to sell securities at inopportune times, and at unfavorable prices. Fixed income securities also may be difficult to value during such periods. In recent periods, governmental financial regulators, including the U.S. Federal Reserve, have taken steps to maintain historically low interest rates by purchasing bonds. Steps by those regulators to curtail or &amp;#8220;taper&amp;#8221; such activities could result in the effects described above, and could have a material adverse effect on prices for fixed income securities and on the management of the Fund. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;High Yield Bond Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investment in debt securities rated below investment grade (commonly known as junk bonds) may adversely affect the Fund&amp;#8217;s yield. Although these securities generally provide for higher yields than higher rated debt securities, the high degree of risk associated with these investments can result in substantial or total loss to the Fund. High yield securities are considered speculative and are subject to a greater risk of loss, greater sensitivity to interest rate changes, increased price volatility, valuation difficulties, and a potential lack of a liquid secondary or public market for the securities. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Inflation Linked Bond Risk.&lt;/b&gt; &amp;nbsp;The possibility that the value of the Fund&amp;#8217;s investments in inflation linked bonds will decline in value in response to a rise in real interest rates resulting in losses to the Fund. Inflation linked bonds may experience greater losses than other debt securities with similar durations when real interest rates rise faster than nominal interest rates. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Interest Rate Risk.&lt;/b&gt; &amp;nbsp;The possibility that the prices of the Fund&amp;#8217;s fixed income investments will decline due to rising interest rates. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt; &amp;nbsp;The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Management Risk.&lt;/b&gt; &amp;nbsp;The possibility that the investment decisions, techniques, analyses or models implemented by the Fund&amp;#8217;s Adviser in seeking to achieve the Fund&amp;#8217;s investment objective may not produce the returns expected, may cause the Fund&amp;#8217;s shares to lose value or may cause the Fund to underperform relevant benchmarks or other funds with similar investment objectives. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt; &amp;nbsp;The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Mortgage- and Asset-Backed Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in mortgage- and asset-backed securities may decline in value and become less liquid when defaults on the underlying mortgages or assets occur and may exhibit additional volatility in periods of rising interest rates. Rising interest rates tend to extend the duration of these securities, making them more sensitive to changes in interest rates than instruments with fixed payment schedules. When interest rates decline or are low, the prepayment of mortgages or assets underlying such securities may reduce the Fund&amp;#8217;s returns. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Portfolio Turnover Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund may frequently buy and sell portfolio securities, which may increase transaction costs to the Fund and cause the Fund&amp;#8217;s performance to be less than you expect. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;U.S. Government Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the U.S. government will not provide financial assistance in support of securities issued by certain of its agencies and instrumentalities and held by the Fund if it is not obligated to do because such securities are not issued or guaranteed by the U.S. Treasury. A default by a U.S. government agency or instrumentality could cause the Fund&amp;#8217;s share price or yield to fall. &lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are seeking the highest current income consistent with liquidity and low risk to principal available through an investment in investment grade debt.</rr:RiskNarrativeTextBlock>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000006724_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. They represent the performance of the Fund's previous managers for the period prior to August 25, 2008. Since August 25, 2008, SSGA Funds Management, Inc. has been responsible for the Fund's day-to-day portfolio management. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund's average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000006724_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000006724_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000006734_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;FLEXIBLY MANAGED FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000006734_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000006734_Member">The investment objective of the Flexibly Managed Fund (the &amp;#8220;Fund&amp;#8221;) is to maximize total return (capital appreciation and income).</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000006734_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006734_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000006734_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000006734_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006734_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000006734_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000006734_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 74% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000006734_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006734_Member">The Fund invests primarily in stocks of established U.S. companies that it believes have above-average potential for capital growth. The Fund&amp;#8217;s investments in stocks are primarily those issued by large capitalization companies, and stocks typically constitute at least half of total assets. The remaining assets are generally invested in other securities, such as convertibles, corporate and government debt securities (including mortgage- and asset-backed securities), high yield securities (commonly known as &amp;#8220;junk bonds&amp;#8221;), bank loans and foreign securities, in keeping with the Fund&amp;#8217;s objective. The Fund&amp;#8217;s investments in stocks generally fall into one of two categories. The larger category comprises long-term core holdings that the Sub-Adviser considers to be underpriced in terms of company assets, earnings, or other factors at the time they are purchased. The smaller category comprises opportunistic investments whose prices the Sub-Adviser expects to rise in the short term, but not necessarily over the long term. There are no limits on the market capitalization of issuers of the stocks in which the Fund invests. Since the Sub-Adviser attempts to prevent losses as well as achieve gains, it typically uses a &amp;#8220;value approach&amp;#8221; in selecting investments. Its in-house research team seeks to identify companies that seem under-valued by various measures, such as price/book value, and may be temporarily out of favor but have good prospects for capital appreciation. The Sub-Adviser may establish relatively large positions in companies it finds particularly attractive. The Fund may also, to a limited extent, invest in options and could write (i.e., sell) call options, primarily in an effort to protect against downside risk or to generate additional income.&lt;br /&gt;&lt;br /&gt;The Fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.&lt;br /&gt;&lt;br /&gt;The Sub-Adviser works as hard to reduce risk as to maximize gains and may realize gains rather than lose them in market declines. In addition, the Sub-Adviser searches for attractive risk/reward values among all types of securities. The portion of the Fund invested in a particular type of security, such as common stocks, results largely from case-by-case investment decisions, and the size of the Fund&amp;#8217;s cash reserve may reflect the Sub-Adviser&amp;#8217;s ability to find companies that meet valuation criteria rather than its market outlook. Bonds, bank loans and convertible securities may be purchased to gain additional exposure to a company or for their income or other features. Maturity and quality are not necessarily major considerations. There are no specified limits on the maturities or credit ratings of the debt instruments in which the Fund invests. The Fund expects to invest more than 25% of its net assets in the banking industry when the Fund&amp;#8217;s position in issues maturing in one year or less equals 35% or more of the Fund&amp;#8217;s total assets. The Fund may invest up to 25% of its total assets in below-investment grade securities. There is no limit on the Fund&amp;#8217;s investments in convertible securities. The Fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.</rr:StrategyNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000006734_Member">&lt;b&gt;Principal Risks of Investing &lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006734_Member">&lt;b&gt;Bank Loans Risk.&lt;/b&gt; &amp;nbsp;The possibility that, to the extent the Fund invests in bank loans, it is exposed to additional risks beyond those associated with traditional debt securities, including liquidity risk, prepayment risk, extension risk, the risk of subordination to other creditors, restrictions on resale, and the lack of a regular trading market and publicly available information. In addition, liquidity risk may be more pronounced for a portfolio investing in loans because certain loans may have a more limited secondary market. These loans may be difficult to value.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Banking Industry Risk.  &lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in securities in the banking industry may be adversely affected by interest rate risk, credit risk, and financial, economic, and regulatory developments affecting the banking industry, such as deteriorating economic and business conditions that cause defaults on bank loans and declines in total deposits. Banks are subject to extensive government regulation that may affect the scope of their activities, their profitability, the prices they charge and the amount of capital they maintain.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;&lt;/b&gt;&lt;b&gt;Convertible Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the value of the Fund&amp;#8217;s investments in convertible securities may be adversely affected by changes in interest rates, the credit of the issuer and the value of the underlying common stock. The market values of convertible securities tend to decline as interest rates increase and, conversely, to increase as interest rates decline. In addition, as the market price of the underlying common stock declines below the conversion price, the price of the convertible security tends to be increasingly influenced by the yield of the convertible security.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Corporate Debt Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the issuer of a debt security held by the Fund is unable to meet its principal and interest payment obligations. The further possibility that corporate debt securities held by the Fund may experience increased price volatility due to such factors as market interest rates, market perception of the creditworthiness of the issuer and general market liquidity.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Credit Risk.&lt;/b&gt; &amp;nbsp;The possibility that an issuer of a debt security, or the counterparty to a derivatives contract, held by the Fund defaults on its payment obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Currency Risk.&lt;/b&gt; &amp;nbsp;The possibility that the value of the Fund&amp;#8217;s assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and restrictions or prohibitions on the repatriation of foreign currencies.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Derivatives Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s use of derivatives, such as futures, options and swap agreements, may lead to losses, including those magnified by leverage, particularly when derivatives are used to enhance return rather than mitigate risk. Certain derivative instruments may be difficult to sell when the Sub-Adviser believes it would be appropriate to do so, difficult to value if the instrument becomes illiquid, or the other party to a derivative contract may be unwilling or unable to fulfill its contractual obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Fixed Income Market Risk. &lt;/b&gt; &amp;nbsp;The possibility that the market value of a fixed-income security may decline due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic conditions, changes in the outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. Fixed income securities markets may, in response to governmental intervention, economic or market developments (including potentially a reduction in the number of broker-dealers willing to engage in market-making activity), or other factors, experience periods of increased, and sometimes unpredictable, volatility and reduced liquidity. During those periods, the Fund may experience increased levels of shareholder redemptions, and may have to sell securities at inopportune times, and at unfavorable prices. Fixed income securities also may be difficult to value during such periods. In recent periods, governmental financial regulators, including the U.S. Federal Reserve, have taken steps to maintain historically low interest rates by purchasing bonds. Steps by those regulators to curtail or &amp;#8220;taper&amp;#8221; such activities could result in the effects described above, and could have a material adverse effect on prices for fixed income securities and on the management of the Fund.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;High Yield Bond Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investment in debt securities rated below investment grade (commonly known as junk bonds) may adversely affect the Fund&amp;#8217;s yield. Although these securities generally provide for higher yields than higher rated debt securities, the high degree of risk associated with these investments can result in substantial or total loss to the Fund. High yield securities are considered speculative and are subject to a greater risk of loss, greater sensitivity to interest rate changes, increased price volatility, valuation difficulties, and a potential lack of a liquid secondary or public market for the securities.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Interest Rate Risk.&lt;/b&gt; &amp;nbsp;The possibility that the prices of the Fund&amp;#8217;s fixed income investments will decline due to rising interest rates.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Investment Style Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund could underperform if the Fund&amp;#8217;s investment style shifts out of favor based on changing market sentiment and conditions.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Large-Cap Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in larger companies may underperform relative to those of smaller companies. Larger more established companies may be unable to respond quickly to new competitive challenges such as changes in technology and consumer tastes and may not be able to attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt; &amp;nbsp;The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Management Risk. &lt;/b&gt; &amp;nbsp;The possibility that the investment decisions, techniques, analyses or models implemented by the Fund&amp;#8217;s Sub-Adviser in seeking to achieve the Fund&amp;#8217;s investment objective may not produce the returns expected, may cause the Fund&amp;#8217;s shares to lose value or may cause the Fund to underperform relevant benchmarks or other funds with similar investment objectives.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Mortgage- and Asset-Backed Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in mortgage- and asset-backed securities may decline in value and become less liquid when defaults on the underlying mortgages or assets occur and may exhibit additional volatility in periods of rising interest rates. Rising interest rates tend to extend the duration of these securities, making them more sensitive to changes in interest rates than instruments with fixed payment schedules. When interest rates decline or are low, the prepayment of mortgages or assets underlying such securities may reduce the Fund&amp;#8217;s returns.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Prepayment and Extension Risk. &lt;/b&gt; &amp;nbsp;The possibility that the principal on a fixed income security may be paid off earlier or later than expected causing the Fund to invest in fixed income securities with lower interest rates, which may adversely affect the Fund&amp;#8217;s performance.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Small- and Mid-Cap Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in small- and mid-cap securities may be subject to greater risk and higher volatility than are customarily associated with investing in larger more established companies. Securities issued by small- and mid-sized companies, which can include start-up companies, tend to be more vulnerable than larger and more established companies to adverse business and economic developments. Such companies generally have narrower product lines, more limited financial resources and more limited markets for their stock as compared with larger companies. As a result, the value of such securities also may be more volatile than the securities of larger companies, and the Fund&amp;#8217;s portfolio may experience difficulty in purchasing or selling such securities at the desired time and price or in the desired amount.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;U.S. Government Securities Risk. &lt;/b&gt; &amp;nbsp;The possibility that the U.S. government will not provide financial assistance in support of securities issued by certain of its agencies and instrumentalities and held by the Fund if it is not obligated to do because such securities are not issued or guaranteed by the U.S. Treasury. A default by a U.S. government agency or instrumentality could cause the Fund&amp;#8217;s share price or yield to fall.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;&amp;#8220;Value&amp;#8221; Investing Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in securities believed by the Sub-Adviser to be undervalued may not realize their perceived value for extended periods of time or may never realize their perceived value. The securities in which the Fund invests may respond differently to market and other developments than other types of securities, and may underperform growth stocks and/or the market as a whole.&lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are seeking a relatively conservative approach to investing for total return and are willing to accept the risks and uncertainties of investing in common stocks and bonds.</rr:RiskNarrativeTextBlock>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member">&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006723_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000006730_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;QUALITY BOND FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006723_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member">&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000006730_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000006723_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;2.57%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-0.80%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;12/31/2008&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;12/31/2010&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006734_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000006730_Member">The Quality Bond Fund (the &amp;#8220;Fund&amp;#8221;) seeks to maximize total return over the long term consistent with the preservation of capital.</rr:ObjectivePrimaryTextBlock>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006734_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006723_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000006734_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;18.67%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-19.44%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;6/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;12/31/2008&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006734_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000006730_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006730_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000006730_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000006734_MemberC000018297_Member" decimals="INF" unitRef="USD">95</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000006734_MemberC000018297_Member" decimals="INF" unitRef="USD">296</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000006734_MemberC000018297_Member" decimals="INF" unitRef="USD">515</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000006734_MemberC000018297_Member" decimals="INF" unitRef="USD">1143</rr:ExpenseExampleYear10>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006730_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000006728_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. They represent the performance of the Fund's previous managers for the period prior to May 1, 2013. Since May 1, 2013, American Century Investment Management, Inc. has been responsible for the Fund's day-to-day portfolio management. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund's average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000006728_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000006728_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006728_MemberC000018291_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006728_MemberC000018291_Member">2009-09-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006728_MemberC000018291_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006728_MemberC000018291_Member">2011-09-30</rr:BarChartLowestQuarterlyReturnDate>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000006725_Member">&lt;b&gt;Example&lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000006725_Member">&lt;b&gt;Portfolio Turnover&lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006725_Member">Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in equity securities of mid-cap companies. For purposes of this policy, mid capitalization companies have market capitalizations that fall within the market capitalization range of companies in the Russell Midcap&lt;sup&gt;&amp;#174;&lt;/sup&gt; Growth Index at the time of purchase (as of March 31, 2015, this range was between $212.69 million and $37.66 billion). Because the Fund's definition of mid-cap companies is dynamic, the lower and upper limits on market capitalization will change with the markets. The Fund will invest in equity securities of companies that the Sub-Adviser believes have strong earnings growth potential and that are diversified across economic sectors. The Fund's exposure is generally limited to 5% of assets in any single issuer, subject to exceptions for the most heavily-weighted securities in the Russell Midcap&lt;sup&gt;&amp;#174;&lt;/sup&gt; Growth Index.</rr:StrategyNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000006725_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesMidCapGrowthFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000006725_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesMidCapGrowthFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000006725_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesMidCapGrowthFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000006725_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesMidCapGrowthFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000006733_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;LARGE CAP VALUE FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000006733_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000006733_Member">The investment objective of the Large Cap Value Fund (the &amp;#8220;Fund&amp;#8221;) is to seek to achieve long-term growth of capital.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000006733_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006733_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000006733_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000006733_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006733_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000006733_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000006733_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 22% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000006733_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006733_Member">The Fund will invest primarily in equity securities, of U.S. and non-U.S. incorporated entities, including, but not limited to common stock, American Depositary Receipts (&amp;#8220;ADRs&amp;#8221;), equity real estate investment trusts (&amp;#8220;REITs&amp;#8221;), preferred securities and convertible preferred securities. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in equity securities of large capitalization companies. For purposes of this policy, large capitalization companies are those with market-capitalizations greater than $2 billion. The Fund primarily invests in common stocks that the portfolio manager deems to be underpriced relative to long-term earnings and for cash flow potential.&lt;br /&gt;&lt;br /&gt;The Sub-Adviser attempts to reduce the Fund&amp;#8217;s exposure to market risks by diversifying its investments, that is, by not holding a substantial amount of stock of any one company and by not investing too great a percentage of the Fund&amp;#8217;s assets in any one company. In selecting securities for purchase or sale by the Fund, the Sub-Adviser selects securities one at a time before considering industry trends. This is called a &amp;#8220;bottom-up approach.&amp;#8221; The Sub-Adviser uses a fundamental analysis to select securities that it believes are undervalued relative to long-term earnings and cash flow potential. While this process and the inter-relationship of the factors used may change over time and its implementation may vary in particular cases, the Sub-Adviser currently considers one or more of the following factors when assessing a company&amp;#8217;s business prospects: attractive valuation, future supply/demand conditions for its key products, product cycles, quality of management, competitive position in the market place, reinvestment plans for cash generated, and better-than-expected earnings reports. The Sub-Adviser may consider selling a stock for one or more of the following reasons: the stock price is approaching its target, the company&amp;#8217;s fundamentals are deteriorating, or alternative investment ideas have been developed.&lt;br /&gt;&lt;br /&gt;While the Fund primarily invests in large capitalization companies, the Fund may invest a portion of its assets (no more than 20%) in small and medium capitalization companies. In addition to common stocks, the Fund may invest in other equity securities, including preferred stocks, warrants, rights, and convertible securities. The Fund may also invest up to 20% of its assets in securities of foreign issuers including emerging market securities, options for hedging and investment purposes, and REITs. The Fund anticipates investing primarily in equity REITs as opposed to mortgage or other types of REITs, which generally invest in and own properties, such as commercial properties, and generate revenue from these property rents. The Fund may also invest up to 15% of its assets in securities issued pursuant to Rule 144A under the Securities Act of 1933 (&amp;#8220;Rule 144A Securities&amp;#8221;).&lt;br /&gt;&lt;br /&gt;Except as provided above and subject to the provisions of the Investment Company Act of 1940, as amended (the &amp;#8220;1940 Act&amp;#8221;), the Fund is not limited in the percentage of its assets that it may invest in these instruments. Securities of foreign issuers that are represented by ADRs or that are listed on a U.S. securities exchange or traded in the U.S. over-the-counter markets are not considered &amp;#8220;foreign securities&amp;#8221; for purposes of this investment restriction. The Fund may invest up to 5% of its assets, as determined at the time of purchase, in any one company.</rr:StrategyNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000006733_Member">&lt;b&gt;Principal Risks of Investing &lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006733_Member">&lt;b&gt;Convertible Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the value of the Fund&amp;#8217;s investments in convertible securities may be adversely affected by changes in interest rates, the credit of the issuer and the value of the underlying common stock. The market values of convertible securities tend to decline as interest rates increase and, conversely, to increase as interest rates decline. In addition, as the market price of the underlying common stock declines below the conversion price, the price of the convertible security tends to be increasingly influenced by the yield of the convertible security.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Currency Risk.&lt;/b&gt; &amp;nbsp;The possibility that the value of the Fund&amp;#8217;s assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and restrictions or prohibitions on the repatriation of foreign currencies.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Derivatives Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s use of derivatives, such as futures, options and swap agreements, may lead to losses, including those magnified by leverage, particularly when derivatives are used to enhance return rather than mitigate risk. Certain derivative instruments may be difficult to sell when the Sub-Adviser believes it would be appropriate to do so, difficult to value if the instrument becomes illiquid, or the other party to a derivative contract may be unwilling or unable to fulfill its contractual obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Depositary Receipt Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in foreign companies through depositary receipts will expose the Fund to the same risks as direct investment in securities of foreign issuers. In addition, investments in ADRs may be less liquid than the underlying shares in their primary trading market, and the value of securities underlying ADRs may change materially at times when U.S. markets are not open for trading.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Emerging Markets Risk.&lt;/b&gt; &amp;nbsp;The possibility that the stocks of companies located in emerging markets may be more volatile, and less liquid, than the stocks of companies located in the U.S. and developed foreign markets due to political, economic, or regulatory conditions within emerging market countries. In addition, emerging market countries may experience more volatile interest and currency exchange rates, higher levels of inflation and less efficient trading and settlement systems.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Interest Rate Risk.&lt;/b&gt; &amp;nbsp;The possibility that the prices of the Fund&amp;#8217;s convertible securities will decline due to rising interest rates.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Large-Cap Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in larger companies may underperform relative to those of smaller companies. Larger more established companies may be unable to respond quickly to new competitive challenges such as changes in technology and consumer tastes and may not be able to attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt; &amp;nbsp;The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt; &amp;nbsp;The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Portfolio Turnover Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund may frequently buy and sell portfolio securities, which may increase transaction costs to the Fund and cause the Fund&amp;#8217;s performance to be less than you expect.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Preferred Stock Risk.&lt;/b&gt; &amp;nbsp;The possibility that the value of the Fund&amp;#8217;s investments in preferred stock may decline if stock prices fall or interest rates rise. In the event of a liquidation, the rights of a company&amp;#8217;s preferred stock to the distribution of company assets are generally subordinate to the rights of a company&amp;#8217;s debt securities.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;REITs Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in REITs will subject the Fund to the risks associated with the direct ownership of real estate, including fluctuations in the value of underlying properties, changes in interest rates and risks related to general or local economic conditions. REITs are dependent upon management skills and generally may not be diversified. REITs are also subject to heavy cash flow dependency, defaults by borrowers or tenants and self-liquidation.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Rule 144A Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investment in Rule 144A Securities will subject the Fund to liquidity risk if there are an insufficient number of qualified institutional buyers interested in purchasing Rule 144A Securities held by the Fund leading to the Fund&amp;#8217;s inability to sell its Rule 144A Securities at a time desired by the Fund or at prices approximating the value at which the Fund is carrying the securities on its books.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Small- and Mid-Cap Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in small- and mid-cap securities may be subject to greater risk and higher volatility than are customarily associated with investing in larger more established companies. Securities issued by small- and mid-sized companies, which can include start-up companies, tend to be more vulnerable than larger and more established companies to adverse business and economic developments. Such companies generally have narrower product lines, more limited financial resources and more limited markets for their stock as compared with larger companies. As a result, the value of such securities also may be more volatile than the securities of larger companies, and the Fund&amp;#8217;s portfolio may experience difficulty in purchasing or selling such securities at the desired time and price or in the desired amount.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;&amp;#8220;Value&amp;#8221; Investing Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in securities believed by the Sub-Adviser to be undervalued may not realize their perceived value for extended periods of time or may never realize their perceived value. The securities in which the Fund invests may respond differently to market and other developments than other types of securities, and may underperform growth stocks and/or the market as a whole.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Warrants Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in warrants are subject to greater price volatility than the warrants&amp;#8217; underlying securities. Warrants offer greater potential for profit or loss than an equivalent investment in the underlying security. A warrant generally ceases to have value if it is not exercised prior to its expiration date.&lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of investing primarily in equity securities of large capitalization companies in the hope of earning long-term growth of capital.</rr:RiskNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006733_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006733_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. They represent the performance of the Fund&amp;#8217;s previous managers for the period prior to May 1, 2013. Since May 1, 2013, Loomis, Sayles &amp;amp; Company, L.P. has been responsible for the Fund&amp;#8217;s day-to-day portfolio management. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000022085_MemberC000063376_Member" decimals="INF" unitRef="USD">89</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000022085_MemberC000063376_Member" decimals="INF" unitRef="USD">278</rr:ExpenseExampleYear03>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000006733_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;19.07%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-26.40%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;6/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;12/31/2008&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000022085_MemberC000063376_Member" decimals="INF" unitRef="USD">482</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000022085_MemberC000063376_Member" decimals="INF" unitRef="USD">1073</rr:ExpenseExampleYear10>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006733_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022085_MemberC000063376_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022085_MemberRussellTenHundredGrowthIndex_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000022079_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000022079_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022079_Member">The Fund attempts to achieve its investment objective by investing primarily in common stocks of small and medium capitalization U.S. companies. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in securities of small and medium capitalization companies. For purposes of this policy, small and medium capitalization companies have market capitalizations that fall within the market capitalization range of companies in the Russell 2500&lt;sup&gt;&amp;#174;&lt;/sup&gt; Growth Index at the time of purchase (as of March 31, 2015, this range was between $29.2 million and $19.4 billion). Because the Fund's definition of small and medium capitalization companies is dynamic, the lower and upper limits on market capitalization will change with the markets. The Fund's investments in small capitalization companies may include micro-capitalization companies.&lt;br /&gt;&lt;br /&gt;The Fund invests principally in equity securities of small and medium capitalization companies that offer the potential for capital growth, with an emphasis on identifying companies that have the prospect for improving sales and earnings growth rates, enjoy a competitive advantage and have effective management with a history of making investments that are in the best interests of shareholders. The Sub-Adviser employs a rigorous bottom-up research process to identify solid investment opportunities. The Sub-Adviser seeks to construct a well diversified portfolio in order to reduce risk while enhancing return.&lt;br /&gt;&lt;br /&gt;The Sub-Adviser may sell a security based on several factors, with valuation the key element. The Sub-Adviser may sell a security if the investment reaches its target price, there is a change in the security's fundamentals or when better investment opportunities emerge.&lt;br /&gt;&lt;br /&gt;The Fund may also invest in U.S. dollar-denominated and U.S. exchange-traded foreign equities, American Depositary Receipts ("ADRs"), real estate investment trusts ("REITs"), shares of other investment companies and exchange-traded funds ("ETFs") and cash instruments maturing in one year or less.&lt;br /&gt;&lt;br /&gt;The Fund may buy and sell portfolio securities actively. If it does, its portfolio turnover rate and transaction costs will rise, which may lower fund performance.</rr:StrategyNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000022079_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesSmidCapGrowthFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000022079_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesSmidCapGrowthFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000022079_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesSmidCapGrowthFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000022079_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesSmidCapGrowthFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000006730_MemberC000018293_Member" decimals="INF" unitRef="USD">70</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000006723_MemberC000018286_Member" decimals="INF" unitRef="USD">74</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000006730_MemberC000018293_Member" decimals="INF" unitRef="USD">221</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000006723_MemberC000018286_Member" decimals="INF" unitRef="USD">230</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000006730_MemberC000018293_Member" decimals="INF" unitRef="USD">384</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000006723_MemberC000018286_Member" decimals="INF" unitRef="USD">401</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000006730_MemberC000018293_Member" decimals="INF" unitRef="USD">859</rr:ExpenseExampleYear10>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000006723_MemberC000018286_Member" decimals="INF" unitRef="USD">894</rr:ExpenseExampleYear10>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000006730_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 135% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000006730_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000022079_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;SMID CAP GROWTH FUND&lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000022079_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000006730_Member">&lt;b&gt;Principal Risks of Investing &lt;/b&gt;</rr:RiskHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000022079_Member">The investment objective of the SMID Cap Growth Fund (the &amp;#8220;Fund&amp;#8221;) is to seek long-term growth of capital (capital appreciation).</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000022079_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022079_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000022079_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000006723_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022079_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000006723_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000006723_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000022079_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 89% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000022079_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000022079_Member">&lt;b&gt;Principal Risks of Investing &lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022079_Member">&lt;b&gt;Depositary Receipt Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in foreign companies through depositary receipts will expose the Fund to the same risks as direct investment in securities of foreign issuers. In addition, investments in ADRs may be less liquid than the underlying shares in their primary trading market, and the value of securities underlying ADRs may change materially at times when U.S. markets are not open for trading. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;&amp;#8220;Growth&amp;#8221; Investing Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in securities of companies perceived to be &amp;#8220;growth&amp;#8221; companies may underperform when value investing is in favor and may be more volatile than other securities because they are more sensitive to investor perceptions of the issuing company&amp;#8217;s growth of earnings potential. Also, because growth companies usually invest a high portion of earnings in their businesses, growth stocks may lack the dividends of some value stocks that can cushion stock prices in a falling market. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt; &amp;nbsp;The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt; &amp;nbsp;The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Micro-Cap Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the return on the Fund&amp;#8217;s investments in micro-cap companies may be less than the return on investments in stocks of larger companies or the stock market as a whole. Stock prices of micro-cap companies may be based in substantial part on future expectations rather than current achievements and may move sharply, especially during market upturns and downturns. Micro-cap companies are followed by relatively few securities analysts, and there tends to be less publicly available information about these companies. Micro-cap companies are more likely to be newly formed or in the early stages of development, depend on a few key employees, and have relatively limited product lines, markets or financial resources compared to larger capitalization companies. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Other Investment Company Risk.&lt;/b&gt; &amp;nbsp;The possibility that investments by the Fund in shares of other investment companies will subject the Fund to the risks associated with those investment companies. Fund shareholders will also indirectly bear a proportionate share of any underlying investment company&amp;#8217;s fees and expenses in addition to paying the Fund&amp;#8217;s expenses. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Portfolio Turnover Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund may frequently buy and sell portfolio securities, which may increase transaction costs to the Fund and cause the Fund&amp;#8217;s performance to be less than you expect. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;REITs Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in REITs will subject the Fund to the risks associated with the direct ownership of real estate, including fluctuations in the value of underlying properties, changes in interest rates and risks related to general or local economic conditions. REITs are dependent upon management skills and generally may not be diversified. REITs are also subject to heavy cash flow dependency, defaults by borrowers or tenants and self-liquidation. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;&lt;/b&gt;&lt;b&gt;Small- and Mid-Cap Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in small- and mid-cap securities may be subject to greater risk and higher volatility than are customarily associated with investing in larger more established companies. Securities issued by small- and mid-sized companies, which can include start-up companies, tend to be more vulnerable than larger and more established companies to adverse business and economic developments. Such companies generally have narrower product lines, more limited financial resources and more limited markets for their stock as compared with larger companies. As a result, the value of such securities also may be more volatile than the securities of larger companies, and the Fund&amp;#8217;s portfolio may experience difficulty in purchasing or selling such securities at the desired time and price or in the desired amount. &lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of investing in common stocks in the hope of earning long-term returns.</rr:RiskNarrativeTextBlock>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006723_MemberC000018286_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022079_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006723_MemberC000018286_Member">2008-12-31</rr:BarChartHighestQuarterlyReturnDate>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022079_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006723_MemberC000018286_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000022079_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;21.48%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-19.83%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;6/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;9/30/2011&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006723_MemberC000018286_Member">2010-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022079_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000022085_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000006725_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;MID CAP GROWTH FUND&lt;/b&gt;</rr:RiskReturnHeading>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000022085_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000022085_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022085_MemberC000063376_Member">&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022085_MemberC000063376_Member">2012-03-31</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022085_MemberC000063376_Member">&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022085_MemberC000063376_Member">2011-09-30</rr:BarChartLowestQuarterlyReturnDate>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000006725_Member">&lt;b&gt;Investment Objective&lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000006725_Member">The investment objective of the Mid Cap Growth Fund (the &amp;#8220;Fund&amp;#8221;) is to maximize capital appreciation.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000022079_MemberC000063370_Member" decimals="INF" unitRef="USD">108</rr:ExpenseExampleYear01>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000006725_Member">&lt;b&gt;Fund Fees and Expenses&lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000022079_MemberC000063370_Member" decimals="INF" unitRef="USD">337</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000022079_MemberC000063370_Member" decimals="INF" unitRef="USD">585</rr:ExpenseExampleYear05>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006725_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000022079_MemberC000063370_Member" decimals="INF" unitRef="USD">1294</rr:ExpenseExampleYear10>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000006725_Member">&lt;b&gt;Annual Fund Operating Expenses&lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006725_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022079_MemberC000063370_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022079_MemberRussellTwentyFiveHundredGrowthIndex_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000006725_MemberC000018288_Member" decimals="INF" unitRef="USD">99</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000006725_MemberC000018288_Member" decimals="INF" unitRef="USD">309</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000006725_MemberC000018288_Member" decimals="INF" unitRef="USD">536</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000006725_MemberC000018288_Member" decimals="INF" unitRef="USD">1190</rr:ExpenseExampleYear10>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000006725_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 140% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000022085_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesLargeCoreGrowthFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000006725_Member">&lt;b&gt;Principal Investment Strategy&lt;/b&gt;</rr:StrategyHeading>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000006733_MemberC000018296_Member" decimals="INF" unitRef="USD">94</rr:ExpenseExampleYear01>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000006725_Member">&lt;b&gt;Principal Risks of Investing&lt;/b&gt;</rr:RiskHeading>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000006733_MemberC000018296_Member" decimals="INF" unitRef="USD">293</rr:ExpenseExampleYear03>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006725_Member">&lt;b&gt;&amp;#8220;Growth&amp;#8221; Investing Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in securities of companies perceived to be &amp;#8220;growth&amp;#8221; companies may underperform when value investing is in favor and may be more volatile than other securities because they are more sensitive to investor perceptions of the issuing company&amp;#8217;s growth of earnings potential. Also, because growth companies usually invest a high portion of earnings in their businesses, growth stocks may lack the dividends of some value stocks that can cushion stock prices in a falling market.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Management Risk.&lt;/b&gt; &amp;nbsp;The possibility that the investment decisions, techniques, analyses or models implemented by the Fund&amp;#8217;s Sub-Adviser in seeking to achieve the Fund&amp;#8217;s investment objective may not produce the returns expected, may cause the Fund&amp;#8217;s shares to lose value or may cause the Fund to underperform relevant benchmarks or other funds with similar investment objectives.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt; &amp;nbsp;The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Mid-Cap Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the return on the Fund&amp;#8217;s investments in mid-cap companies may be less than the return on investments in stocks of larger or smaller companies or the stock market as a whole. Mid-cap companies may be more vulnerable to market volatility and adverse business or economic events than larger, more established companies. The securities of mid-cap companies are more likely to trade in lower volumes and are generally subject to greater and less predictable price changes than the securities of larger capitalization companies.&lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of investing in mid-cap stocks in the hope of achieving above-average capital appreciation.</rr:RiskNarrativeTextBlock>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000006733_MemberC000018296_Member" decimals="INF" unitRef="USD">509</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000006733_MemberC000018296_Member" decimals="INF" unitRef="USD">1131</rr:ExpenseExampleYear10>
  <rr:ExpensesRestatedToReflectCurrent contextRef="Duration_02May2014_01May2015S000006734_Member">The expense information in the table has been restated to reflect an increase in the Fund's Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</rr:ExpensesRestatedToReflectCurrent>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000006734_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000006734_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000006734_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006734_MemberC000018297_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006734_MemberC000018297_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006734_MemberC000018297_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006734_MemberC000018297_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000022085_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesLargeCoreGrowthFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000022085_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesLargeCoreGrowthFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000022085_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesLargeCoreGrowthFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006725_Member">&lt;b&gt;Performance Information&lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006725_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. They represent the performance of the Fund&amp;#8217;s previous managers for the period prior to May 1, 2014. Since May 1, 2014, Ivy Investment Management Company has been responsible for the Fund&amp;#8217;s day-to-day portfolio management. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000006725_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;22.84%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-28.78%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;9/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;12/31/2008&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:ExpensesRestatedToReflectCurrent contextRef="Duration_02May2014_01May2015S000006723_Member">The expense information in the table has been restated to reflect an increase in the Fund&amp;#8217;s Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</rr:ExpensesRestatedToReflectCurrent>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006725_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000022079_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000022079_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000022079_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000006737_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000006737_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006737_Member">Under normal circumstances, the Fund will invest at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in equity securities of small capitalization companies. For purposes of this policy, small capitalization companies have market capitalizations of less than $4 billion at the time of purchase. The small capitalization companies in which the Fund invests will be selected for their growth potential. The Fund's investments in small capitalization companies may include micro-capitalization companies.&lt;br /&gt;&lt;br /&gt;The Sub-Adviser applies a "bottom up" approach in choosing investments. In other words, the Sub-Adviser looks at companies one at a time to determine if a company is an attractive investment opportunity and if it is consistent with the Fund's investment policies.</rr:StrategyNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000006737_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesSmallCapGrowthFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000006737_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesSmallCapGrowthFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000006737_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesSmallCapGrowthFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000006737_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesSmallCapGrowthFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000006736_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000006736_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006736_Member">The Fund is managed using a value oriented approach. The Sub-Adviser evaluates securities using fundamental analysis and intends to purchase equity investments that are, in its view, underpriced relative to a combination of such companies' long term earnings prospects, growth rate, free cash flow and/or dividend-paying ability. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in a diversified portfolio of equity investments in small-cap issuers with public stock market capitalizations (based upon shares available for trading on an unrestricted basis) within the range of the market capitalization of companies constituting the Russell 2000&lt;sup&gt;&amp;#174;&lt;/sup&gt; Value Index at the time of investment (as of March 31, 2015, this range was between $5 million and $5.965 billion). If the market capitalization of a company held by the Fund moves outside this range, the Fund may, but is not required to, sell the securities. Because the Fund's definition of small-cap issuers is dynamic, the lower and upper limits on market capitalization will change with the markets. The Fund's investments in small capitalization companies may include micro-capitalization companies and "unseasoned companies," which are companies that (together with their predecessors) have operated for less than three years. The Russell 2000&lt;sup&gt;&amp;#174;&lt;/sup&gt; Value Index measures the performance of those Russell 2000 companies with lower price to book ratio and lower forecasted growth values. Through fundamental proprietary research the Fund will attempt to take advantage of what the Sub-Adviser believes to be well-positioned cash generating businesses run by shareholder-orientated managements. The Sub-Adviser will seek to buy these companies opportunistically at a price low enough to provide a healthy margin of safety. Under normal circumstances, the Fund's investment horizons for ownership of stocks will be two to three years.&lt;br /&gt;&lt;br /&gt;Although the Fund will invest primarily in publicly traded U.S. securities, including real estate investment trusts ("REITs"), it may invest up to 25% of its net assets in foreign securities, including securities of issuers in emerging countries and securities quoted in foreign currencies. The Fund may, but is not required to, undertake hedging activities and may invest in certain instruments, such as forward currency exchange contracts, and may use certain techniques to hedge currency risks associated with the purchase of individual securities denominated in a foreign currency. The Fund may invest in the aggregate up to 20% of its net assets in companies with public stock market capitalizations outside the range of companies constituting the Russell 2000&lt;sup&gt;&amp;#174;&lt;/sup&gt; Value Index at the time of investment.</rr:StrategyNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000006736_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesSmallCapValueFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000006736_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesSmallCapValueFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000006736_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesSmallCapValueFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000006736_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesSmallCapValueFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022079_MemberC000063370_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022079_MemberC000063370_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022079_MemberC000063370_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022079_MemberC000063370_Member">2011-09-30</rr:BarChartLowestQuarterlyReturnDate>
  <rr:ExpensesRestatedToReflectCurrent contextRef="Duration_02May2014_01May2015S000006733_Member">The expense information in the table has been restated to reflect an increase in the Fund's Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</rr:ExpensesRestatedToReflectCurrent>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000006733_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. They represent the performance of the Fund&amp;#8217;s previous managers for the period prior to May 1, 2013. Since May 1, 2013, Loomis, Sayles &amp;amp; Company, L.P. has been responsible for the Fund&amp;#8217;s day-to-day portfolio management. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000006733_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000006733_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006733_MemberC000018296_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006733_MemberC000018296_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006733_MemberC000018296_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006733_MemberC000018296_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006730_Member">&lt;b&gt;Call Risk.&lt;/b&gt; &amp;nbsp;The possibility that, during periods of falling interest rates, an issuer may redeem a security by repaying it early, which may reduce the Fund&amp;#8217;s income if the proceeds are reinvested at lower interest rates. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Convertible Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the value of the Fund&amp;#8217;s investments in convertible securities may be adversely affected by changes in interest rates, the credit of the issuer and the value of the underlying common stock. The market values of convertible securities tend to decline as interest rates increase and, conversely, to increase as interest rates decline. In addition, as the market price of the underlying common stock declines below the conversion price, the price of the convertible security tends to be increasingly influenced by the yield of the convertible security. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Corporate Debt Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the issuer of a debt security held by the Fund is unable to meet its principal and interest payment obligations. The further possibility that corporate debt securities held by the Fund may experience increased price volatility due to such factors as market interest rates, market perception of the creditworthiness of the issuer and general market liquidity. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Credit Risk.&lt;/b&gt; &amp;nbsp;The possibility that an issuer of a debt security, or the counterparty to a derivatives contract, held by the Fund defaults on its payment obligations. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Currency Risk.&lt;/b&gt; &amp;nbsp;The possibility that the value of the Fund&amp;#8217;s assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and restrictions or prohibitions on the repatriation of foreign currencies. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Derivatives Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s use of derivatives, such as futures, options and swap agreements, may lead to losses, including those magnified by leverage, particularly when derivatives are used to enhance return rather than mitigate risk. Certain derivative instruments may be difficult to sell when the Sub-Adviser believes it would be appropriate to do so, difficult to value if the instrument becomes illiquid, or the other party to a derivative contract may be unwilling or unable to fulfill its contractual obligations. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Emerging Markets Risk.&lt;/b&gt; &amp;nbsp;The possibility that the stocks of companies located in emerging markets may be more volatile, and less liquid, than the stocks of companies located in the U.S. and developed foreign markets due to political, economic, or regulatory conditions within emerging market countries. In addition, emerging market countries may experience more volatile interest and currency exchange rates, higher levels of inflation and less efficient trading and settlement systems. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Fixed Income Market Risk.&lt;/b&gt; &amp;nbsp;The possibility that the market value of a fixed-income security may decline due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic conditions, changes in the outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. Fixed income securities markets may, in response to governmental intervention, economic or market developments (including potentially a reduction in the number of broker-dealers willing to engage in market-making activity), or other factors, experience periods of increased, and sometimes unpredictable, volatility and reduced liquidity. During those periods, the Fund may experience increased levels of shareholder redemptions, and may have to sell securities at inopportune times, and at unfavorable prices. Fixed income securities also may be difficult to value during such periods. In recent periods, governmental financial regulators, including the U.S. Federal Reserve, have taken steps to maintain historically low interest rates by purchasing bonds. Steps by those regulators to curtail or &amp;#8220;taper&amp;#8221; such activities could result in the effects described above, and could have a material adverse effect on prices for fixed income securities and on the management of the Fund. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;High Yield Bond Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investment in debt securities rated below investment grade (commonly known as junk bonds) may adversely affect the Fund&amp;#8217;s yield. Although these securities generally provide for higher yields than higher rated debt securities, the high degree of risk associated with these investments can result in substantial or total loss to the Fund. High yield securities are considered speculative and are subject to a greater risk of loss, greater sensitivity to interest rate changes, increased price volatility, valuation difficulties, and a potential lack of a liquid secondary or public market for the securities. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Inflation Linked Bond Risk.&lt;/b&gt; &amp;nbsp;The possibility that the value of the Fund&amp;#8217;s investments in inflation linked bonds will decline in value in response to a rise in real interest rates resulting in losses to the Fund. Inflation linked bonds may experience greater losses than other debt securities with similar durations when real interest rates rise faster than nominal interest rates. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Interest Rate Risk.&lt;/b&gt; &amp;nbsp;The possibility that the prices of the Fund&amp;#8217;s fixed income investments will decline due to rising interest rates. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt; &amp;nbsp;The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Management Risk.&lt;/b&gt; &amp;nbsp;The possibility that the investment decisions, techniques, analyses or models implemented by the Fund&amp;#8217;s Sub-Adviser in seeking to achieve the Fund&amp;#8217;s investment objective may not produce the returns expected, may cause the Fund&amp;#8217;s shares to lose value or may cause the Fund to underperform relevant benchmarks or other funds with similar investment objectives. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt; &amp;nbsp;The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Mortgage- and Asset-Backed Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in mortgage- and asset-backed securities may decline in value and become less liquid when defaults on the underlying mortgages or assets occur and may exhibit additional volatility in periods of rising interest rates. Rising interest rates tend to extend the duration of these securities, making them more sensitive to changes in interest rates than instruments with fixed payment schedules. When interest rates decline or are low, the prepayment of mortgages or assets underlying such securities may reduce the Fund&amp;#8217;s returns. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Portfolio Turnover Risk.&lt;/b&gt;  &amp;nbsp;The possibility that the Fund may frequently buy and sell portfolio securities, which may increase transaction costs to the Fund and cause the Fund&amp;#8217;s performance to be less than you expect. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;U.S. Government Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the U.S. government will not provide financial assistance in support of securities issued by certain of its agencies and instrumentalities and held by the Fund if it is not obligated to do because such securities are not issued or guaranteed by the U.S. Treasury. A default by a U.S. government agency or instrumentality could cause the Fund&amp;#8217;s share price or yield to fall. &lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are seeking investment income and preservation of principal.</rr:RiskNarrativeTextBlock>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000006725_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. They represent the performance of the Fund&amp;#8217;s previous managers for the period prior to May 1, 2014. Since May 1, 2014, Ivy Investment Management Company has been responsible for the Fund&amp;#8217;s day-to-day portfolio management. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000006725_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000006725_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000006737_Member">&lt;b&gt;FUND SUMMARY:&amp;nbsp; SMALL CAP GROWTH FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000006736_Member">&lt;b&gt;FUND SUMMARY:&amp;nbsp; SMALL CAP VALUE FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000006737_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000006736_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000006737_Member">The investment objective of the Small Cap Growth Fund (the &amp;#8220;Fund&amp;#8221;) is capital appreciation.</rr:ObjectivePrimaryTextBlock>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000006736_Member">The investment objective of the Small Cap Value Fund (the &amp;#8220;Fund&amp;#8221;) is to seek capital appreciation.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000006737_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000006736_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006737_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006736_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000006737_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000006736_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006725_MemberC000018288_Member">&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006725_MemberC000018288_Member">2009-09-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006725_MemberC000018288_Member">&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006725_MemberC000018288_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000006733_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesLargeCapValueFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000006733_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesLargeCapValueFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006736_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006737_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000006733_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesLargeCapValueFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000006736_MemberC000018299_Member" decimals="INF" unitRef="USD">107</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000006737_MemberC000018300_Member" decimals="INF" unitRef="USD">104</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000006736_MemberC000018299_Member" decimals="INF" unitRef="USD">334</rr:ExpenseExampleYear03>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000006733_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesLargeCapValueFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000006737_MemberC000018300_Member" decimals="INF" unitRef="USD">325</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000006736_MemberC000018299_Member" decimals="INF" unitRef="USD">579</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000006736_MemberC000018299_Member" decimals="INF" unitRef="USD">1283</rr:ExpenseExampleYear10>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000006737_MemberC000018300_Member" decimals="INF" unitRef="USD">563</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000006737_MemberC000018300_Member" decimals="INF" unitRef="USD">1248</rr:ExpenseExampleYear10>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006730_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006730_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000006736_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 45% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000006737_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 33% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000006736_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000006737_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000006736_Member">&lt;b&gt;Principal Risks of Investing &lt;/b&gt;</rr:RiskHeading>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000006737_Member">&lt;b&gt;Principal Risks of Investing &lt;/b&gt;</rr:RiskHeading>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000006735_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000006735_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006735_Member">Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in equity securities, such as common stocks, preferred stocks, convertible bonds, and warrants. The Fund will invest primarily in companies operating in the countries in Europe and the Pacific Basin. The countries include the eleven Euro-zone countries (France, Germany, Italy, Spain, Portugal, Finland, Ireland, Belgium, the Netherlands, Luxembourg and Austria), the United Kingdom, Denmark, Sweden, Switzerland, Norway, Japan, Hong Kong, Australia, New Zealand and Singapore. The Sub-Adviser employs bottom-up stock and business analysis to identify high-quality growth companies. Typically, these companies tend to be well managed with the following attributes: consistent operating histories and financial performance; favorable long-term economic prospects; free cash flow generation; and competent management that can be counted on to use cash flow wisely, and channel the reward from the business back to its shareholders. The Sub-Adviser's goal is to construct a portfolio of high-quality growth companies in the developed markets of Europe and the Pacific Basin. With approximately 40-70 stocks, the Fund seeks to be well diversified and will have investments in at least 10 countries and 5 sectors at all times. The Fund may invest in securities of companies in emerging and developing markets. The Fund may, but is not required to, undertake hedging activities and may invest in certain instruments, such as forward currency exchange contracts, and may use certain techniques to hedge currency risks associated with the purchase of individual securities denominated in a foreign currency.</rr:StrategyNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000006735_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesInternationalEquityFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000006735_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesInternationalEquityFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000006735_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesInternationalEquityFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000006735_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesInternationalEquityFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000006735_Member">&lt;b&gt;FUND SUMMARY:&amp;nbsp;  INTERNATIONAL EQUITY FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006736_Member">&lt;b&gt;Currency Risk.&lt;/b&gt;&amp;nbsp; The possibility that the value of the Fund&amp;#8217;s assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and restrictions or prohibitions on the repatriation of foreign currencies. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Derivatives Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s use of derivatives, such as futures, options and swap agreements, may lead to losses, including those magnified by leverage, particularly when derivatives are used to enhance return rather than mitigate risk. Certain derivative instruments may be difficult to sell when the Sub-Adviser believes it would be appropriate to do so, difficult to value if the instrument becomes illiquid, or the other party to a derivative contract may be unwilling or unable to fulfill its contractual obligations. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Emerging Markets Risk&lt;/b&gt;&lt;b&gt;.&lt;/b&gt;&amp;nbsp; The possibility that the stocks of companies located in emerging markets may be more volatile, and less liquid, than the stocks of companies located in the U.S. and developed foreign markets due to political, economic, or regulatory conditions within emerging market countries. In addition, emerging market countries may experience more volatile interest and currency exchange rates, higher levels of inflation and less efficient trading and settlement systems. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Investment Style Risk.&amp;nbsp; &lt;/b&gt;The possibility that the Fund could underperform if the Fund&amp;#8217;s investment style shifts out of favor based on changing market sentiment and conditions. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt;&amp;nbsp; The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt;&amp;nbsp; The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Micro-Cap Securities Risk.&lt;/b&gt;&amp;nbsp; The possibility that the return on the Fund&amp;#8217;s investments in micro-cap companies may be less than the return on investments in stocks of larger companies or the stock market as a whole. Stock prices of micro-cap companies may be based in substantial part on future expectations rather than current achievements and may move sharply, especially during market upturns and downturns. Micro-cap companies are followed by relatively few securities analysts, and there tends to be less publicly available information about these companies. Micro-cap companies are more likely to be newly formed or in the early stages of development, depend on a few key employees, and have relatively limited product lines, markets or financial resources compared to larger capitalization companies. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;REITs Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s investments in REITs will subject the Fund to the risks associated with &lt;b&gt;&lt;/b&gt;the direct ownership of real estate, including fluctuations in the value of underlying properties, changes in interest rates and risks related to general or local economic conditions. REITs are dependent upon management skills and generally may not be diversified. REITs are also subject to heavy cash flow dependency, defaults by borrowers or tenants and self-liquidation. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Small-Cap Securities Risk.&lt;/b&gt;&amp;nbsp; The possibility that the return on the Fund&amp;#8217;s investments in small-cap companies may trail the return on investments in stocks of larger companies or the stock market as a whole. Stock prices of smaller companies may be based in substantial part on future expectations rather than current achievements and may move sharply, especially during market upturns and downturns. Small-cap companies generally depend on a few key employees and have relatively limited product lines, markets or financial resources compared to larger capitalization companies. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Unseasoned Company Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s investment in relatively new or unseasoned companies that are in their early stages of development may expose the Fund to greater risks than investments in more established companies with more extensive financial histories and greater liquidity. Unseasoned companies do not have proven track records and may lack substantial capital reserves. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;&amp;#8220;Value&amp;#8221; Investing Risk.&amp;nbsp; &lt;/b&gt;The possibility that the Fund&amp;#8217;s investments in securities believed by the Sub-Adviser to be undervalued may not realize their perceived value for extended periods of time or may never realize their perceived value. The securities in which the Fund invests may respond differently to market and other developments than other types of securities, and may underperform growth stocks and/or the market as a whole. &lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of investing in small-cap stocks in the hope of earning above-average capital appreciation.</rr:RiskNarrativeTextBlock>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006737_Member">&lt;b&gt;&amp;#8220;Growth&amp;#8221; Investing Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s investments in securities of companies perceived to be &amp;#8220;growth&amp;#8221; companies may underperform when value investing is in favor and may be more volatile than other securities because they are more sensitive to investor perceptions of the issuing company&amp;#8217;s growth of earnings potential. Also, because growth companies usually invest a high portion of earnings in their businesses, growth stocks may lack the dividends of some value stocks that can cushion stock prices in a falling market. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;IPOs Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s performance may be affected by the purchase of securities issued in initial public offerings (IPOs) that have little to no trading history, limited issuer information, increased volatility and may not be available to the extent desired. The prices of securities bought in IPOs may rise and fall rapidly, often because of investor perceptions rather than economic reasons. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt;&amp;nbsp; The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt;&amp;nbsp; The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Small-Cap Securities Risk.&lt;/b&gt;&amp;nbsp; The possibility that the return on the Fund&amp;#8217;s investments in small-cap companies may trail the return on investments in stocks of larger companies or the stock market as a whole. Stock prices of smaller companies may be based in substantial part on future expectations rather than current achievements and may move sharply, especially during market upturns and downturns. Small-cap companies generally depend on a few key employees and have relatively limited product lines, markets or financial resources compared to larger capitalization companies. &lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of investing in small cap growth companies in the hope of earning capital appreciation.</rr:RiskNarrativeTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000006730_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;6.59%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-2.75%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;9/30/2011&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;6/30/2013&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000006735_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000006735_Member">The investment objective of the International Equity Fund (the &amp;#8220;Fund&amp;#8221;) is to achieve capital appreciation.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000006735_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006735_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000006735_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006735_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000006735_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 31% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006730_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000006735_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000006735_Member">&lt;b&gt;Principal Risks of Investing &lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006735_Member">&lt;b&gt;Convertible Securities Risk.&amp;nbsp;  &lt;/b&gt;The possibility that the value of the Fund&amp;#8217;s investments in convertible securities may be adversely affected by changes in interest rates, the credit of the issuer and the value of the underlying common stock. The market values of convertible securities tend to decline as interest rates increase and, conversely, to increase as interest rates decline. In addition, as the market price of the underlying common stock declines below the conversion price, the price of the convertible security tends to be increasingly influenced by the yield of the convertible security.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Currency Risk.&amp;nbsp;&lt;/b&gt;  The possibility that the value of the Fund&amp;#8217;s assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and restrictions or prohibitions on the repatriation of foreign currencies. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Derivatives Risk.&amp;nbsp;  &lt;/b&gt;The possibility that the Fund&amp;#8217;s use of derivatives, such as futures, options and swap agreements, may lead to losses, including those magnified by leverage, particularly when derivatives are used to enhance return rather than mitigate risk. Certain derivative instruments may be difficult to sell when the Sub-Adviser believes it would be appropriate to do so, difficult to value if the instrument becomes illiquid, or the other party to a derivative contract may be unwilling or unable to fulfill its contractual obligations. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Emerging Markets Risk.&amp;nbsp; &lt;/b&gt;  The possibility that the stocks of companies located in emerging markets may be more volatile, and less liquid, than the stocks of companies located in the U.S. and developed foreign markets due to political, economic, or regulatory conditions within emerging market countries. In addition, emerging market countries may experience more volatile interest and currency exchange rates, higher levels of inflation and less efficient trading and settlement systems. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.&amp;nbsp;&lt;/b&gt;  The possibility that the Fund&amp;#8217;s investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Investment Style Risk.&amp;nbsp;  &lt;/b&gt;The possibility that the Fund could underperform if the Fund&amp;#8217;s investment style shifts out of favor based on changing market sentiment and conditions.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&amp;nbsp;&lt;/b&gt;  The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&amp;nbsp;&lt;/b&gt;  The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Preferred Stock Risk.&amp;nbsp;  &lt;/b&gt;The possibility that the value of the Fund&amp;#8217;s investments in preferred stock may decline if stock prices fall or interest rates rise. In the event of a liquidation, the rights of a company&amp;#8217;s preferred stock to the distribution of company assets are generally subordinate to the rights of a company&amp;#8217;s debt securities.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Warrants Risk.&amp;nbsp;  &lt;/b&gt;The possibility that the Fund&amp;#8217;s investments in warrants are subject to greater price volatility than the warrants&amp;#8217; underlying securities. Warrants offer greater potential for profit or loss than an equivalent investment in the underlying security. A warrant generally ceases to have value if it is not exercised prior to its expiration date.&lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of international investing in the hope of realizing capital appreciation while diversifying their investment portfolio.</rr:RiskNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006735_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006735_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index and one additional index, the MSCI ACWI (All Country World Index) ex-U.S. Index. The foregoing indices, when considered together, may provide investors with a useful comparison of the Fund&amp;#8217;s overall performance. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000006735_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;18.48%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-19.10%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;6/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;9/30/2008&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006735_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006737_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006736_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006737_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. They represent the performance of the Fund&amp;#8217;s previous managers for the period prior to May 1, 2013. Since May 1, 2013, Janus Capital Management LLC has been responsible for the Fund&amp;#8217;s day-to-day portfolio management. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006736_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000006737_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;34.99%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-28.98%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;6/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;12/31/2008&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000006736_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;19.74%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-20.25%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;9/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;9/30/2011&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000022076_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000022076_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022076_Member">The Fund seeks to achieve its investment objective by using a "fund-of-funds" strategy. Accordingly, the Fund invests in a combination of other Penn Series Funds (each, an "underlying fund" and, collectively, the "underlying funds") in accordance with its target asset allocations. These underlying funds invest their assets directly in equity, fixed income, money market and other securities in accordance with their own investment objectives and policies. The underlying funds are managed using both indexed and active management strategies.&lt;br /&gt;&lt;br /&gt;The Fund has its own distinct target portfolio allocation and is designed to accommodate specific investment goals and risk tolerances. Through its investments in the underlying funds, the Fund's target allocation is intended to allocate the Fund's assets among various asset classes, such as equity securities, fixed income securities and money market securities. The portfolio of the Fund is more heavily allocated to stocks, and reflects an aggressive approach.&lt;br /&gt;&lt;br /&gt;In determining the asset allocation of the Fund, the Adviser will rely on the experience of its investment personnel and its evaluation of the overall financial markets, including, but not limited to, information about the economy, interest rates, and the long-term absolute and relative returns of various asset classes. Consideration will also be given to the investment styles of the managers of the underlying funds and their historic patterns of performance relative to their asset class and to other underlying funds. Periodic changes in allocations among the underlying funds will be based on information about the financial markets, changes within particular underlying funds, or the introduction of new Penn Series Funds that would, in the Adviser's opinion, enhance the return potential of the Fund. These changes will be implemented as necessary, recognizing that these decisions tend to be long-term in nature, based on information about the financial markets and on the Fund's investment objective.&lt;br /&gt;&lt;br /&gt;The following chart shows the Fund's target asset allocation among the various asset classes. The Adviser may permit modest deviations from the target asset allocations listed below. Accordingly, the Fund's actual allocations may differ from this illustration.&lt;br/&gt;&lt;br/&gt;&lt;table cellspacing="0" cellpadding="0" width="70%" border="0" style="border-collapse:collapse"&gt; &lt;tr&gt; &lt;td width="47%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="24%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center" style="border-left:1px solid #000000; border-top:1px solid #000000; border-bottom:1px solid #000000; padding-left:8px"&gt;&lt;b&gt;Asset Class&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom" style="border-left:1px solid #000000; border-top:1px solid #000000; border-bottom:1px solid #000000"&gt;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center" style="border-top:1px solid #000000; border-right:1px solid #000000; border-bottom:1px solid #000000; padding-right:8px"&gt;&lt;b&gt;Target Asset Allocation&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" style="border-left:1px solid #000000; border-bottom:1px solid #000000; padding-left:8px"&gt;&lt;b&gt;Equity Funds&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom" style="border-left:1px solid #000000; border-bottom:1px solid #000000"&gt;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center" style="border-right:1px solid #000000; border-bottom:1px solid #000000"&gt;85% - 100%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" style="border-left:1px solid #000000; border-bottom:1px solid #000000; padding-left:8px"&gt;&lt;b&gt;Fixed Income and Money Market Funds&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom" style="border-left:1px solid #000000; border-bottom:1px solid #000000"&gt;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center" style="border-right:1px solid #000000; border-bottom:1px solid #000000"&gt;0% - 15%&lt;/td&gt;&lt;/tr&gt; &lt;/table&gt;&lt;br /&gt;The Adviser reserves the right to modify the Fund's target asset allocations and to substitute other underlying funds and add additional underlying funds from time to time should circumstances warrant a change. The Adviser may periodically rebalance the Fund's investments in the underlying funds to bring the Fund back within its target range.</rr:StrategyNarrativeTextBlock>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022076_Member">&lt;b&gt;Asset Allocation Risk.  &lt;/b&gt;&amp;nbsp;The possibility that the Fund may underperform other funds with similar investment objectives due to the Fund's allocation of assets to underlying funds investing in asset classes or market sectors that perform poorly relative to other asset categories.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.  &lt;/b&gt;&amp;nbsp;The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Underlying Fund Investment Risk.  &lt;/b&gt;&amp;nbsp;The possibility that the underperformance of an underlying fund may contribute to the underperformance of the Fund. The Fund's performance and risks will be directly related to the performance and risks of the underlying funds in which it invests. In addition, the Fund indirectly pays a pro rata portion of the expenses incurred by the underlying funds, which also may lower the Fund's performance.&lt;blockquote&gt;&lt;b&gt;Corporate Debt Securities Risk.  &lt;/b&gt;&amp;nbsp;The possibility that the issuer of a debt security held by an underlying fund is unable to meet its principal and interest payment obligations. The further possibility that corporate debt securities held by an underlying fund may experience increased price volatility due to such factors as market interest rates, market perception of the creditworthiness of the issuer and general market liquidity.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Credit Risk.  &lt;/b&gt;&amp;nbsp;The possibility that an issuer of a debt security, or the counterparty to a derivatives contract, held by an underlying fund defaults on its payment obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Derivatives Risk.  &lt;/b&gt;&amp;nbsp;The possibility that an underlying fund's use of derivatives, such as futures, options and swap agreements, may lead to losses, including those magnified by leverage, particularly when derivatives are used to enhance return rather than mitigate risk. Certain derivative instruments may be difficult to sell when the Adviser or Sub-Adviser of the underlying fund believes it would be appropriate to do so, difficult to value if the instrument becomes illiquid, or the other party to a derivative contract may be unwilling or unable to fulfill its contractual obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.  &lt;/b&gt;&amp;nbsp;The possibility that an underlying fund's investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;"Growth" Investing Risk.  &lt;/b&gt;&amp;nbsp;The possibility that an underlying fund's investments in securities of companies perceived to be "growth" companies may underperform when value investing is in favor and may be more volatile than other securities because they are more sensitive to investor perceptions of the issuing company's growth of earnings potential. Also, because growth companies usually invest a high portion of earnings in their businesses, growth stocks may lack the dividends of some value stocks that can cushion stock prices in a falling market.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;High Yield Bond Risk.  &lt;/b&gt;&amp;nbsp;The possibility that an underlying fund's investment in debt securities rated below investment grade (commonly known as junk bonds) may adversely affect the underlying fund's yield. Although these securities generally provide for higher yields than higher rated debt securities, the high degree of risk associated with these investments can result in substantial or total loss to the underlying fund. High yield securities are considered speculative and are subject to a greater risk of loss, greater sensitivity to interest rate changes, increased price volatility, valuation difficulties, and a potential lack of a liquid secondary or public market for the securities.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Interest Rate Risk.  &lt;/b&gt;&amp;nbsp;The possibility that the prices of an underlying fund's fixed income investments will decline due to rising interest rates.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Investment Risk.  &lt;/b&gt;&amp;nbsp;You may lose money by investing in the Money Market Fund. Although the Money Market Fund seeks to preserve the value of your investment at $1.00 per share, there is no guarantee that the Money Market Fund will be able to do so.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Large-Cap Securities Risk.  &lt;/b&gt;&amp;nbsp;The possibility that an underlying fund's investments in larger companies may underperform relative to those of smaller companies. Larger more established companies may be unable to respond quickly to new competitive challenges such as changes in technology and consumer tastes and may not be able to attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.  &lt;/b&gt;&amp;nbsp;The possibility that the market for certain of an underlying fund's investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for an underlying fund to purchase a desired investment at an advantageous price under such circumstances.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Portfolio Turnover Risk.  &lt;/b&gt;&amp;nbsp;The possibility that an underlying fund may frequently buy and sell portfolio securities, which may increase transaction costs to the underlying fund and cause the underlying fund's performance to be less than you expect.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Prepayment and Extension Risk.  &lt;/b&gt;&amp;nbsp;The possibility that the principal on a fixed income security may be paid off earlier or later than expected causing an underlying fund to invest in fixed income securities with lower interest rates, which may adversely affect the underlying fund's performance.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Small- and Mid-Cap Securities Risk.  &lt;/b&gt;&amp;nbsp;The possibility that an underlying fund's investments in small- and mid-cap securities may be subject to greater risk and higher volatility than are customarily associated with investing in larger more established companies. Securities issued by small- and mid-sized companies, which can include start-up companies, tend to be more vulnerable than larger and more established companies to adverse business and economic developments. Such companies generally have narrower product lines, more limited financial resources and more limited markets for their stock as compared with larger companies. As a result, the value of such securities also may be more volatile than the securities of larger companies, and an underlying fund's portfolio may experience difficulty in purchasing or selling such securities at the desired time and price or in the desired amount.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;U.S. Government Securities Risk.  &lt;/b&gt;&amp;nbsp;The possibility that the U.S. government will not provide financial assistance in support of securities issued by certain of its agencies and instrumentalities and held by an underlying fund if it is not obligated to do because such securities are not issued or guaranteed by the U.S. Treasury. A default by a U.S. government agency or instrumentality could cause an underlying fund's share price or yield to fall.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;"Value" Investing Risk.  &lt;/b&gt;&amp;nbsp;The possibility that an underlying fund's investments in securities perceived to be undervalued may not realize their perceived value for extended periods of time or may never realize their perceived value. The securities in which an underlying fund invests may respond differently to market and other developments than other types of securities, and may underperform growth stocks and/or the market as a whole.&lt;/blockquote&gt;</rr:RiskNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000022076_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesAggressiveAllocationFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000022076_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesAggressiveAllocationFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000022076_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesAggressiveAllocationFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000022076_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesAggressiveAllocationFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006737_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000006730_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000006730_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000006730_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006730_MemberC000018293_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006730_MemberC000018293_Member">2011-09-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006730_MemberC000018293_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006730_MemberC000018293_Member">2013-06-30</rr:BarChartLowestQuarterlyReturnDate>
  <rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees contextRef="Duration_02May2014_01May2015S000006730_Member">The Total Annual Fund Operating Expenses in this fee table may not correlate to the expense ratios in the Fund&amp;#8217;s financial highlights and financial statements because the financial highlights and financial statements reflect only the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses, which are fees and expenses incurred indirectly by the Fund through its investments in certain underlying investment companies.</rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees>
  <rr:ExpensesRestatedToReflectCurrent contextRef="Duration_02May2014_01May2015S000006730_Member">The expense information in the table has been restated to reflect an increase in the Fund&amp;#8217;s Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</rr:ExpensesRestatedToReflectCurrent>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000006737_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. They represent the performance of the Fund's previous managers for the period prior to May 1, 2013. Since May 1, 2013, Janus Capital Management LLC has been responsible for the Fund's day-to-day portfolio management. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund's average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000006737_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000022080_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000022080_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022080_Member">The Fund invests primarily in a diversified portfolio of equity securities of small and medium capitalization U.S. companies, generally representing 60 to 125 companies. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in securities of small and medium capitalization companies. For this Fund, small and medium capitalization companies are those that, at the time of investment, fall within the capitalization range between the smallest company in the Russell 2500&amp;#8482; Value Index (as of March 31, 2015, this amount was $5.48 million) and the greater of $5 billion or the market capitalization of the largest company in the Russell 2500&amp;#8482; Value Index (as of March 31, 2015, this amount was $14.75 billion). Because the Fund's definition of small and medium capitalization companies is dynamic, the lower and upper limits on market capitalization will change with the markets. The Fund's investments in small capitalization companies may include micro-capitalization companies.&lt;br /&gt;&lt;br /&gt;The Fund invests in companies that are determined by the Sub-Adviser to be undervalued, using its fundamental value approach. In selecting securities for the Fund, the Sub-Adviser uses its fundamental research to identify companies whose long-term earnings power is not reflected in the current market price of their securities. The Sub-Adviser's fundamental value approach to equity investing generally defines value as the relationship between a security's current price and its intrinsic economic value, as measured by long-term earnings prospects.&lt;br /&gt;&lt;br /&gt;To the extent that companies involved in certain industries may from time to time constitute a material portion of the universe of small and medium capitalization companies, the Fund may also invest significantly in these industries (but not more than 25% of its total assets in any one industry). The Fund may invest in American Depositary Receipts ("ADRs") and non-U.S. securities.&lt;br /&gt;&lt;br /&gt;The Sub-Adviser will generally sell a security when it reaches fair value on a risk-adjusted basis. Typically, growth in the size of a company's market capitalization relative to other domestically traded companies will not cause the Sub-Adviser to dispose of the security.&lt;br /&gt;&lt;br /&gt;The Fund may invest in securities issued by non-U.S. companies and enter into forward commitments.</rr:StrategyNarrativeTextBlock>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000006737_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000022080_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesSmidCapValueFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000022080_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesSmidCapValueFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000022080_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesSmidCapValueFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000022080_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesSmidCapValueFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000022076_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;AGGRESSIVE ALLOCATION FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000022076_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000022076_Member">The investment objective of the Aggressive Allocation Fund (the &amp;#8220;Fund&amp;#8221;) is to seek to achieve long-term capital growth consistent with its asset allocation strategy.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000022076_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022076_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000022076_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006737_MemberC000018300_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006737_MemberC000018300_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006737_MemberC000018300_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006737_MemberC000018300_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000006731_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000006731_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006731_Member">Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in a widely diversified portfolio of high yield corporate bonds (commonly known as "junk bonds"), income-producing convertible securities and preferred stocks that are rated below investment-grade or not rated by any major credit rating agency but deemed to be below investment-grade by the Sub-Adviser. High yield bonds are rated below investment grade (BB and lower, or an equivalent rating), and tend to provide high income in an effort to compensate investors for their higher risk of default, which is the failure to make required interest or principal payments. High yield bond issuers include small or relatively new companies lacking the history or capital to merit investment grade status, former blue-chip companies downgraded because of financial problems, companies electing to borrow heavily to finance or avoid a takeover or buyout, and firms with heavy debt loads.&lt;br /&gt;&lt;br /&gt;The Fund's dollar-weighted average maturity generally is expected to be in the five- to ten-year range, but will vary with market conditions. In selecting investments for the Fund, the Sub-Adviser relies extensively on its credit research analysts. The Fund intends to focus primarily on the higher-quality range (BB and B, or an equivalent rating) of the high yield market.&lt;br /&gt;&lt;br /&gt;While most assets will typically be invested in U.S. dollar-denominated bonds, the Fund may also invest in bonds of foreign issuers as well as use forward currency exchange contracts and credit default swaps in keeping with the Fund's objectives. Forward currency exchange contracts would typically be used to protect the Fund's foreign bond holdings from adverse currency movements relative to the U.S. dollar and credit default swaps would typically be used to protect the value of certain portfolio holdings or to manage the Fund's overall exposure to changes in credit quality.&lt;br /&gt;&lt;br /&gt;The Fund may sell holdings for a variety of reasons, such as to adjust a portfolio's average maturity or credit quality, or to shift assets into and out of higher-yielding securities, or to reduce exposure to certain securities.</rr:StrategyNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000006731_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesHighYieldBondFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000006731_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesHighYieldBondFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000006731_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesHighYieldBondFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000006731_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesHighYieldBondFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000022080_Member">&lt;b&gt;FUND SUMMARY:  &amp;nbsp;SMID CAP VALUE FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000022080_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000006731_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;HIGH YIELD BOND FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000022080_Member">The investment objective of the SMID Cap Value Fund (the &amp;#8220;Fund&amp;#8221;) is to seek long-term growth of capital.</rr:ObjectivePrimaryTextBlock>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000006731_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000006731_Member">The investment objective of the High Yield Bond Fund (the &amp;#8220;Fund&amp;#8221;) is to realize high current income.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000022080_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000006731_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022080_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006731_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000022080_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000006731_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000022086_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;LARGE CORE VALUE FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000022086_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000022086_Member">The investment objective of the Large Core Value Fund (the &amp;#8220;Fund&amp;#8221;) is to seek total return.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000022086_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022080_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022086_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000022078_Member">&lt;b&gt;Example&lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000022078_Member">&lt;b&gt;Portfolio Turnover&lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022078_Member">Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in securities listed in the Russell 2000&lt;sup&gt;&amp;#174;&lt;/sup&gt; Index (the "Index"). Under normal circumstances, however, the Fund intends to invest substantially all of its assets in securities of companies included in the Index and close substitutes (such as index futures contracts or other investment companies) that are designed to track the Index. The Index measures the performance of the 2,000 smallest companies (based on total market capitalization) in the Russell 3000&lt;sup&gt;&amp;#174;&lt;/sup&gt; Index. The Fund may concentrate (invest 25% or more of the value of its assets) in the securities of issuers having their principal business activities in the same industry if the Index is also concentrated in such industry. The Fund's investments in small capitalization companies may include micro-capitalization companies.&lt;br /&gt;&lt;br /&gt;The Sub-Adviser does not manage the Fund according to traditional methods of "active" investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment. Instead, the Sub-Adviser utilizes a "passive" investment approach, attempting to replicate the investment performance of its benchmark Index through automated statistical analytic procedures.&lt;br /&gt;&lt;br /&gt;The Sub-Adviser seeks to replicate the returns of the Index by investing in the securities of the Index in approximately their Index weight. However, under various circumstances, it may not be possible or practicable to purchase all of those securities in those weightings. In those circumstances, the Fund may purchase a sample of stocks in the Index in proportions expected to replicate generally the performance of the Index as a whole. In addition, from time to time, stocks are added to or removed from the Index. The Fund may sell stocks that are represented in the Index, or purchase stocks that are not yet represented in the Index, in anticipation of their removal from or addition to the Index.&lt;br /&gt;&lt;br /&gt;The Sub-Adviser may at times purchase or sell futures contracts in lieu of investment directly in the stocks making up the Index. The Sub-Adviser might do so, for example, in order to increase the Fund's investment exposure pending investment of cash in the stocks comprising the Index. Alternatively, the Sub-Adviser might use futures to reduce its investment exposure to the Index in situations where it intends to sell a portion of the stocks in the Fund's portfolio but the sale has not yet been completed.</rr:StrategyNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000022078_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesSmallCapIndexFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000022078_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesSmallCapIndexFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000022078_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesSmallCapIndexFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000022078_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesSmallCapIndexFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000022086_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000022080_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 51% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000022086_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000022080_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022086_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000022086_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000022086_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 80% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000022080_Member">&lt;b&gt;Principal Risks of Investing &lt;/b&gt;</rr:RiskHeading>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000022086_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022086_Member">The Fund invests primarily in value stocks of large capitalization companies. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in securities of large capitalization companies. For this Fund, large capitalization companies are those companies having market capitalizations equal to or greater than the median capitalization of companies included in the Russell 1000&lt;sup&gt;&amp;#174;&lt;/sup&gt; Value Index at the time of purchase (as of March 31, 2015, the median capitalization was $7.6 billion). Because the Fund&amp;#8217;s definition of large capitalization companies is dynamic, it will change with the markets. Value stocks are stocks that, in the opinion of the Sub-Adviser, are inexpensive or undervalued relative to the overall stock market.&lt;br /&gt;&lt;br /&gt;The Fund primarily invests in dividend-paying stocks, but may also invest in non-income producing stocks. The Fund may invest in real estate investment trusts (&amp;#8220;REITs&amp;#8221;). The Fund may invest up to 25% of its total assets in foreign securities, some of which may be located in emerging market countries. Securities of foreign issuers that are represented by American Depositary Receipts (&amp;#8220;ADRs&amp;#8221;) are not subject to this restriction.&lt;br /&gt;&lt;br /&gt;The Sub-Adviser may consider a company&amp;#8217;s earnings or cash flow capabilities, dividend prospects, financial strength, growth potential, the strength of the company&amp;#8217;s business franchises and management team, sustainability of a company&amp;#8217;s competitiveness, and estimates of a company&amp;#8217;s net value when selecting securities. The Sub-Adviser may sell a security when the Sub-Adviser&amp;#8217;s price objective for the security is reached, the fundamentals of the company deteriorate, a security&amp;#8217;s price falls below acquisition cost or to pursue more attractive investment options.&lt;br /&gt;&lt;br /&gt;The Fund may buy and sell portfolio securities actively. If it does, its portfolio turnover rate and transaction costs will rise, which may lower Fund performance.</rr:StrategyNarrativeTextBlock>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022080_Member">&lt;b&gt;Currency Risk.&lt;/b&gt; &amp;nbsp;The possibility that the value of the Fund&amp;#8217;s assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and restrictions or prohibitions on the repatriation of foreign currencies. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Depositary Receipt Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in foreign companies through depositary receipts will expose the Fund to the same risks as direct investment in securities of foreign issuers. In addition, investments in ADRs may be less liquid than the underlying shares in their primary trading market, and the value of securities underlying ADRs may change materially at times when U.S. markets are not open for trading. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Forward Commitment Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund engages in when-issued, delayed delivery or forward commitment transactions (e.g., TBAs) and a counterparty fails to consummate the sale, resulting in a missed opportunity by the Fund to obtain an advantageous price or yield. Such transactions may also have the effect of leverage on the Fund and may cause the Fund to be more volatile. Additionally, these transactions may create a higher portfolio turnover rate. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt; &amp;nbsp;The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt; &amp;nbsp;The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Small- and Mid-Cap Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in small- and mid-cap securities may be subject to greater risk and higher volatility than are customarily associated with investing in larger more established companies. Securities issued by small- and mid-sized companies, which can include start-up companies, tend to be more vulnerable than larger and more established companies to adverse business and economic developments. Such companies generally have narrower product lines, more limited financial resources and more limited markets for their stock as compared with larger companies. As a result, the value of such securities also may be more volatile than the securities of larger companies, and the Fund&amp;#8217;s portfolio may experience difficulty in purchasing or selling such securities at the desired time and price or in the desired amount. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;&amp;#8220;Value&amp;#8221; Investing Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in securities believed by the Sub-Adviser to be undervalued may not realize their perceived value for extended periods of time or may never realize their perceived value. The securities in which the Fund invests may respond differently to market and other developments than other types of securities, and may underperform growth stocks and/or the market as a whole. &lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of investing in common stocks in the hope of long-term growth of capital.</rr:RiskNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000022086_Member">&lt;b&gt;Principal Risks of Investing &lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022086_Member">&lt;b&gt;Currency Risk.&lt;/b&gt;&amp;nbsp; The possibility that the value of the Fund&amp;#8217;s assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and restrictions or prohibitions on the repatriation of foreign currencies.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Depositary Receipt Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s investments in foreign companies through depositary receipts will expose the Fund to the same risks as direct investment in securities of foreign issuers. In addition, investments in ADRs may be less liquid than the underlying shares in their primary trading market, and the value of securities underlying ADRs may change materially at times when U.S. markets are not open for trading.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Emerging Markets Risk.&lt;/b&gt;&amp;nbsp; The possibility that the stocks of companies located in emerging markets may be more volatile, and less liquid, than the stocks of companies located in the U.S. and developed foreign markets due to political, economic, or regulatory conditions within emerging market countries. In addition, emerging market countries may experience more volatile interest and currency exchange rates, higher levels of inflation and less efficient trading and settlement systems.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Large-Cap Securities Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s investments in larger companies may underperform relative to those of smaller companies. Larger more established companies may be unable to respond quickly to new competitive challenges such as changes in technology and consumer tastes and may not be able to attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt;&amp;nbsp; The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Management Risk.&lt;/b&gt;&amp;nbsp; The possibility that the investment decisions, techniques, analyses or models implemented by the Fund&amp;#8217;s Sub-Adviser in seeking to achieve the Fund&amp;#8217;s investment objective may not produce the returns expected, may cause the Fund&amp;#8217;s shares to lose value or may cause the Fund to underperform relevant benchmarks or other funds with similar investment objectives.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt;&amp;nbsp; The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Portfolio Turnover Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund may frequently buy and sell portfolio securities, which may increase transaction costs to the Fund and cause the Fund&amp;#8217;s performance to be less than you expect.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;REITs Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s investments in REITs will subject the Fund to the risks associated with the direct ownership of real estate, including fluctuations in the value of underlying properties, changes in interest rates and risks related to general or local economic conditions. REITs are dependent upon management skills and generally may not be diversified. REITs are also subject to heavy cash flow dependency, defaults by borrowers or tenants and self-liquidation.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;&amp;#8220;Value&amp;#8221; Investing Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s investments in securities believed by the Sub-Adviser to be undervalued may not realize their perceived value for extended periods of time or may never realize their perceived value. The securities in which the Fund invests may respond differently to market and other developments than other types of securities, and may underperform growth stocks and/or the market as a whole.&lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of investing in common stocks in the hope of earning long-term growth of capital and income.</rr:RiskNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022080_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022080_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022086_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022086_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000022086_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;14.96%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-16.11%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;9/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;9/30/2011&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022086_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000006735_MemberC000018298_Member" decimals="INF" unitRef="USD">117</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000006735_MemberC000018298_Member" decimals="INF" unitRef="USD">365</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000006735_MemberC000018298_Member" decimals="INF" unitRef="USD">633</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000006735_MemberC000018298_Member" decimals="INF" unitRef="USD">1398</rr:ExpenseExampleYear10>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022076_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000022080_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;24.07%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-22.52%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;9/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;9/30/2011&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022080_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000022081_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesBalancedFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000022081_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesBalancedFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000022081_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesBalancedFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000022076_MemberC000063367_Member" decimals="INF" unitRef="USD">132</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000022076_MemberC000063367_Member" decimals="INF" unitRef="USD">412</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000022076_MemberC000063367_Member" decimals="INF" unitRef="USD">713</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000022076_MemberC000063367_Member" decimals="INF" unitRef="USD">1568</rr:ExpenseExampleYear10>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000022076_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 20% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000022086_MemberC000063377_Member" decimals="INF" unitRef="USD">95</rr:ExpenseExampleYear01>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000022076_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000022086_MemberC000063377_Member" decimals="INF" unitRef="USD">296</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000022086_MemberC000063377_Member" decimals="INF" unitRef="USD">515</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000022080_MemberC000063371_Member" decimals="INF" unitRef="USD">126</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000022086_MemberC000063377_Member" decimals="INF" unitRef="USD">1143</rr:ExpenseExampleYear10>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000022080_MemberC000063371_Member" decimals="INF" unitRef="USD">393</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000022080_MemberC000063371_Member" decimals="INF" unitRef="USD">681</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000022080_MemberC000063371_Member" decimals="INF" unitRef="USD">1500</rr:ExpenseExampleYear10>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000022081_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;BALANCED FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000022078_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;SMALL CAP INDEX FUND&lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000022081_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022086_MemberRussellTenHundredValueIndex_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022086_MemberC000063377_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000022081_Member">The investment objective of the Balanced Fund (the &amp;#8220;Fund&amp;#8221;) is to seek long-term growth and current income.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000022081_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022081_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000022078_Member">&lt;b&gt;Investment Objective&lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000022078_Member">The investment objective of the Small Cap Index Fund (the &amp;#8220;Fund&amp;#8221;) is to seek to replicate the returns and characteristics of a small cap index.</rr:ObjectivePrimaryTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000022081_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022080_MemberC000063371_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022080_MemberRussellTwentyFiveValueIndex_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000022081_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022081_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000022081_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000022081_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 8% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000022078_Member">&lt;b&gt;Fund Fees and Expenses&lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022078_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000022081_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000022078_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022081_Member">The Fund seeks to achieve its investment objective by using a "fund-of-funds" strategy. Accordingly, the Fund invests in a combination of other Penn Series Funds (each, an "underlying fund" and, collectively, the "underlying funds") in accordance with its target asset allocation. These underlying funds invest their assets directly in equity, fixed income, money market and other securities in accordance with their own investment objectives and policies. The underlying funds are managed using both indexed and active management strategies. The Fund intends to invest primarily in a combination of underlying funds; however, the Fund may invest directly in equity and fixed income securities and cash equivalents, including money market securities.&lt;br /&gt;&lt;br /&gt;Under normal circumstances, the Fund will invest 50%-70% of its assets in stock and other equity underlying funds, 30%-50% of its assets in bond and other fixed income funds, and 0%-20% of its assets in money market funds. The Fund's allocation strategy is designed to provide a mix of the growth opportunities of stock investing with the income opportunities of bonds and other fixed income securities.&lt;br /&gt;&lt;br /&gt;The Fund's underlying equity fund allocation will primarily track the performance of the large capitalization company portion of the U.S. stock market. The Fund's underlying fixed income fund allocation will be invested primarily in a broad range of investment grade fixed income securities (although up to 10% of the underlying fund may be invested in non-investment grade securities (commonly known as "junk bonds")), and is intended to provide results consistent with the broad U.S. fixed income market.&lt;br /&gt;&lt;br /&gt;The following chart shows the Fund's target asset allocation among the various asset classes. The Adviser may permit modest deviations from the target asset allocations listed below. Market appreciation or depreciation may cause the Fund to be outside of its target asset allocation range. In addition, differences in the performance of the underlying funds and the size and frequency of purchase and redemption orders may affect the Fund's actual allocations. Accordingly, the Fund's actual allocations may differ from this illustration.&lt;br /&gt;&lt;br /&gt;&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="85%"&gt; &lt;tr&gt; &lt;td width="46%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="22%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid; PADDING-LEFT: 8px; BORDER-TOP: #000000 1px solid" valign="bottom" nowrap="nowrap" align="center"&gt;&lt;b&gt;Asset Classes and Underlying Funds&lt;/b&gt;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid; BORDER-TOP: #000000 1px solid" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; PADDING-RIGHT: 8px; BORDER-TOP: #000000 1px solid; BORDER-RIGHT: #000000 1px solid" valign="bottom" align="center"&gt;&lt;b&gt;Target&amp;nbsp;Asset Allocation&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid; PADDING-LEFT: 8px" valign="top"&gt;&lt;b&gt;Equity Fund&lt;/b&gt;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-RIGHT: #000000 1px solid" valign="bottom" align="center"&gt;50%&amp;nbsp;-&amp;nbsp;70%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid; PADDING-LEFT: 25px" valign="top"&gt; Penn Series Index 500 Fund&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-RIGHT: #000000 1px solid" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid; PADDING-LEFT: 8px" valign="top"&gt;&lt;b&gt;Fixed Income Fund&lt;/b&gt;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-RIGHT: #000000 1px solid" valign="bottom" align="center"&gt;30%&amp;nbsp;-&amp;nbsp;50%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid; PADDING-LEFT: 25px" valign="top"&gt; Penn Series Quality Bond Fund&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-RIGHT: #000000 1px solid" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid; PADDING-LEFT: 8px" valign="top"&gt;&lt;b&gt;Money Market Fund&lt;/b&gt;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-RIGHT: #000000 1px solid" valign="bottom" align="center"&gt;0%&amp;nbsp;-&amp;nbsp;20%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid; PADDING-LEFT: 25px" valign="top"&gt; Penn Series Money Market Fund&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-RIGHT: #000000 1px solid" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;&lt;br/&gt;The Fund&amp;#8217;s investment performance is directly related to the investment performance of the underlying funds. A brief description of each underlying fund&amp;#8217;s principal investment strategy is provided below.&lt;br/&gt;&lt;br/&gt;&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="100%"&gt; &lt;tr&gt; &lt;td width="29%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="3%"&gt;&lt;/td&gt; &lt;td width="65%"&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid; PADDING-LEFT: 8px; BORDER-TOP: #000000 1px solid" valign="bottom" nowrap="nowrap" align="center"&gt;&lt;b&gt;Underlying Funds&lt;/b&gt;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid; BORDER-TOP: #000000 1px solid" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; PADDING-RIGHT: 8px; BORDER-TOP: #000000 1px solid; BORDER-RIGHT: #000000 1px solid" valign="bottom" align="center"&gt;&lt;b&gt;Investment Objective and Principal Investment Strategy&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid; PADDING-LEFT: 8px" valign="top"&gt;Penn Series Index 500 Fund&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; PADDING-RIGHT: 8px; BORDER-RIGHT: #000000 1px solid" valign="top"&gt;Seeks a total return (capital appreciation and income) which corresponds to that of the S&amp;amp;P 500 Index. Under normal circumstances, the Fund intends to invest substantially all of its assets in securities of companies included in the Index and close substitutes (such as index futures contracts) that are designed to track the S&amp;amp;P 500 Index.&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid; PADDING-LEFT: 8px" valign="top"&gt;Penn Series Quality Bond Fund&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; PADDING-RIGHT: 8px; BORDER-RIGHT: #000000 1px solid" valign="top"&gt;Seeks to maximize total return over the long term consistent with the preservation of capital. Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in marketable investment grade debt securities.&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid; PADDING-LEFT: 8px" valign="top"&gt;Penn Series Money Market Fund&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; BORDER-LEFT: #000000 1px solid" valign="bottom"&gt;&amp;nbsp;&lt;/td&gt; &lt;td style="BORDER-BOTTOM: #000000 1px solid; PADDING-RIGHT: 8px; BORDER-RIGHT: #000000 1px solid" valign="top"&gt;To preserve capital and achieve the highest income consistent with high liquidity. The Fund invests in a diversified portfolio of high-quality money market instruments. The Fund seeks to maintain a stable price of $1.00 per share.&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:StrategyNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000022081_Member">&lt;b&gt;Principal Risks of Investing &lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022081_Member">&lt;b&gt;Asset Allocation Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund may underperform other funds with similar investment objectives due to the Fund&amp;#8217;s allocation of assets to underlying funds investing in asset classes or market sectors that perform poorly relative to other asset categories.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.  &lt;/b&gt; &amp;nbsp;The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Underlying Fund Investment Risk.&lt;/b&gt; &amp;nbsp;The possibility that the underperformance of an underlying fund may contribute to the underperformance of the Fund. The Fund&amp;#8217;s performance and risks will be directly related to the performance and risks of the underlying funds in which it invests. In addition, the Fund indirectly pays a pro rata portion of the expenses incurred by the underlying funds, which also may lower the Fund&amp;#8217;s performance.&lt;br /&gt;&lt;blockquote&gt;&lt;b&gt;Concentration Risk.  &lt;/b&gt; &amp;nbsp;The possibility that, to the extent an underlying fund invests to a significant extent in a particular industry or group of industries within a particular sector, the underlying fund may be subject to greater risks than if its investments were broadly diversified across industries and sectors. The underlying fund also is subject to loss due to adverse occurrences that may affect that industry or group of industries.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Convertible Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the value of an underlying fund&amp;#8217;s investments in convertible securities may be adversely affected by changes in interest rates, the credit of the issuer and the value of the underlying common stock. The market values of convertible securities tend to decline as interest rates increase and, conversely, to increase as interest rates decline. In addition, as the market price of the underlying common stock declines below the conversion price, the price of the convertible security tends to be increasingly influenced by the yield of the convertible security.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Corporate Debt Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the issuer of a debt security held by an underlying fund is unable to meet its principal and interest payment obligations. The further possibility that corporate debt securities held by an underlying fund may experience increased price volatility due to such factors as market interest rates, market perception of the creditworthiness of the issuer and general market liquidity.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Credit Risk.  &lt;/b&gt; &amp;nbsp;The possibility that an issuer of a debt security, or the counterparty to a derivatives contract, held by an underlying fund defaults on its payment obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Derivatives Risk.&lt;/b&gt; &amp;nbsp;The possibility that an underlying fund&amp;#8217;s use of derivatives, such as futures, options and swap agreements, may lead to losses, including those magnified by leverage, particularly when derivatives are used to enhance return rather than mitigate risk. Certain derivative instruments may be difficult to sell when the Adviser or Sub-Adviser of the underlying fund believes it would be appropriate to do so, difficult to value if the instrument becomes illiquid, or the other party to a derivative contract may be unwilling or unable to fulfill its contractual obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;High Yield Bond Risk.  &lt;/b&gt; &amp;nbsp;The possibility that an underlying fund&amp;#8217;s investment in debt securities rated below investment grade (commonly known as junk bonds) may adversely affect the underlying fund&amp;#8217;s yield. Although these securities generally provide for higher yields than higher rated debt securities, the high degree of risk associated with these investments can result in substantial or total loss to an underlying fund. High yield securities are considered speculative and are subject to a greater risk of loss, greater sensitivity to interest rate changes, increased price volatility, valuation difficulties, and a potential lack of a liquid secondary or public market for the securities.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Interest Rate Risk.  &lt;/b&gt; &amp;nbsp;The possibility that the prices of an underlying fund&amp;#8217;s fixed income investments will decline due to rising interest rates.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Investment Risk.&lt;/b&gt; &amp;nbsp;You may lose money by investing in the Money Market Fund. Although the Money Market Fund seeks to preserve the value of your investment at $1.00 per share, there is no guarantee that the Money Market Fund will be able to do so.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Large-Cap Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that an underlying fund&amp;#8217;s investments in larger companies may underperform relative to those of smaller companies. Larger more established companies may be unable to respond quickly to new competitive challenges such as changes in technology and consumer tastes and may not be able to attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt; &amp;nbsp;The possibility that the market for certain of an underlying fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for an underlying fund to purchase a desired investment at an advantageous price under such circumstances.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Mortgage- and Asset-Backed Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that an underlying fund&amp;#8217;s investments in mortgage- and asset-backed securities may decline in value and become less liquid when defaults on the underlying mortgages or assets occur and may exhibit additional volatility in periods of rising interest rates. Rising interest rates tend to extend the duration of these securities, making them more sensitive to changes in interest rates than instruments with fixed payment schedules. When interest rates decline or are low, the prepayment of mortgages or assets underlying such securities may reduce the underlying fund&amp;#8217;s returns.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Portfolio Turnover Risk.  &lt;/b&gt; &amp;nbsp;The possibility that an underlying fund may frequently buy and sell portfolio securities, which may increase transaction costs to the underlying fund and cause the underlying fund&amp;#8217;s performance to be less than you expect.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Prepayment and Extension Risk.&lt;/b&gt; &amp;nbsp;The possibility that the principal on a fixed income security may be paid off earlier or later than expected causing an underlying fund to invest in fixed income securities with lower interest rates, which may adversely affect the underlying fund&amp;#8217;s performance.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Sampling Risk.  &lt;/b&gt; &amp;nbsp;The possibility that an underlying fund may not hold all of the securities included in its benchmark index and that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the underlying fund&amp;#8217;s benchmark index.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Tracking Error Risk.&lt;/b&gt; &amp;nbsp;The possibility that an underlying fund&amp;#8217;s performance may deviate from that of the benchmark index it seeks to track. This risk may be heightened during times of increased market volatility or other unusual market conditions.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;U.S. Government Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the U.S. government will not provide financial assistance in support of securities issued by certain of its agencies and instrumentalities and held by an underlying fund if it is not obligated to do because such securities are not issued or guaranteed by the U.S. Treasury. A default by a U.S. government agency or instrumentality could cause an underlying fund&amp;#8217;s share price or yield to fall.&lt;/blockquote&gt;An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of investing in a fund which allocates its assets among various asset classes and market segments in the hope of achieving long-term growth and current income.</rr:RiskNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022081_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022081_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022078_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000022081_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;10.51%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-6.23%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;9/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;3/31/2009&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022081_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000022078_MemberC000063369_Member" decimals="INF" unitRef="USD">76</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000022078_MemberC000063369_Member" decimals="INF" unitRef="USD">237</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000022078_MemberC000063369_Member" decimals="INF" unitRef="USD">411</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000022078_MemberC000063369_Member" decimals="INF" unitRef="USD">918</rr:ExpenseExampleYear10>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000022078_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 20% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000022078_Member">&lt;b&gt;Principal Investment Strategy&lt;/b&gt;</rr:StrategyHeading>
  <rr:ExpensesRestatedToReflectCurrent contextRef="Duration_02May2014_01May2015S000006736_Member">The expense information in the table has been restated to reflect a reduction in the Fund's Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</rr:ExpensesRestatedToReflectCurrent>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000022076_Member">&lt;b&gt;Principal Risks &lt;/b&gt;</rr:RiskHeading>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000006736_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund's average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000022078_Member">&lt;b&gt;Principal Risks of Investing&lt;/b&gt;</rr:RiskHeading>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000006736_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000006736_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022078_Member">&lt;b&gt;Concentration Risk.&lt;/b&gt; &amp;nbsp;The possibility that, to the extent the Fund invests to a significant extent in a particular industry or group of industries within a particular sector, the Fund may be subject to greater risks than if its investments were broadly diversified across industries and sectors. The Fund also is subject to loss due to adverse occurrences that may affect that industry or group of industries.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Derivatives Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s use of derivatives, such as futures, options and swap agreements, may lead to losses, including those magnified by leverage, particularly when derivatives are used to enhance return rather than mitigate risk. Certain derivative instruments may be difficult to sell when the Sub-Adviser believes it would be appropriate to do so, difficult to value if the instrument becomes illiquid, or the other party to a derivative contract may be unwilling or unable to fulfill its contractual obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Investment Style Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund could underperform if the Fund&amp;#8217;s investment style shifts out of favor based on changing market sentiment and conditions.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt; &amp;nbsp;The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt; &amp;nbsp;The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Micro-Cap Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the return on the Fund&amp;#8217;s investments in micro-cap companies may be less than the return on investments in stocks of larger companies or the stock market as a whole. Stock prices of micro-cap companies may be based in substantial part on future expectations rather than current achievements and may move sharply, especially during market upturns and downturns. Micro-cap companies are followed by relatively few securities analysts, and there tends to be less publicly available information about these companies. Micro-cap companies are more likely to be newly formed or in the early stages of development, depend on a few key employees, and have relatively limited product lines, markets or financial resources compared to larger capitalization companies.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Other Investment Company Risk.&lt;/b&gt; &amp;nbsp;The possibility that investments by the Fund in shares of other investment companies will subject the Fund to the risks associated with those investment companies. Fund shareholders will also indirectly bear a proportionate share of any underlying investment company&amp;#8217;s fees and expenses in addition to paying the Fund&amp;#8217;s expenses.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Passive Investment Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s return may be lower than the return of an actively managed fund because the Fund holds shares of a security based on the holdings of its benchmark index, not the current or projected performance of a security, industry or sector. The Fund does not take defensive positions under any market conditions, including declining markets.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Sampling Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund may not hold all of the securities included in its benchmark index and that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the Fund&amp;#8217;s benchmark index.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Small-Cap Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the return on the Fund&amp;#8217;s investments in small-cap companies may trail the return on investments in stocks of larger companies or the stock market as a whole. Stock prices of smaller companies may be based in substantial part on future expectations rather than current achievements and may move sharply, especially during market upturns and downturns. Small-cap companies generally depend on a few key employees and have relatively limited product lines, markets or financial resources compared to larger capitalization companies.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Tracking Error Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s performance may deviate from that of the benchmark index it seeks to track. This risk may be heightened during times of increased market volatility or other unusual market conditions.&lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of investing in small cap common stocks in the hope of achieving returns similar to that of the Index.</rr:RiskNarrativeTextBlock>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006736_MemberC000018299_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006736_MemberC000018299_Member">2009-09-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006736_MemberC000018299_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006736_MemberC000018299_Member">2011-09-30</rr:BarChartLowestQuarterlyReturnDate>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000022081_MemberC000063372_Member" decimals="INF" unitRef="USD">70</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000022081_MemberC000063372_Member" decimals="INF" unitRef="USD">221</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000022081_MemberC000063372_Member" decimals="INF" unitRef="USD">384</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000022081_MemberC000063372_Member" decimals="INF" unitRef="USD">859</rr:ExpenseExampleYear10>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022078_Member">&lt;b&gt;Performance Information&lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006731_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022078_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000022078_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;20.47%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-21.94%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;6/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;9/30/2011&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000006731_MemberC000018294_Member" decimals="INF" unitRef="USD">89</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000006731_MemberC000018294_Member" decimals="INF" unitRef="USD">278</rr:ExpenseExampleYear03>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000022080_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000006731_MemberC000018294_Member" decimals="INF" unitRef="USD">482</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000006731_MemberC000018294_Member" decimals="INF" unitRef="USD">1073</rr:ExpenseExampleYear10>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022078_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000022080_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000022080_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022080_MemberC000063371_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022080_MemberC000063371_Member">2009-09-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022078_MemberC000063369_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022078_MemberRussellTwentyHundredIndex_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022080_MemberC000063371_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022080_MemberC000063371_Member">2011-09-30</rr:BarChartLowestQuarterlyReturnDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022081_MemberSandpFiveHundredIndex_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000006732_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000006732_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006732_Member">Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in common stocks of large capitalization companies. For purposes of this policy, large capitalization companies have market capitalizations that fall within the market capitalization range of companies in the Russell 1000&amp;#174; Growth Index at the time of purchase (as of March 31, 2015, this range was between $200 million and $724.8 billion). Because the Fund's definition of large capitalization companies is dynamic, the lower and upper limits on market capitalization will change with the markets. The Fund will invest primarily in common stocks of well established companies the Sub-Adviser believes have long-term growth potential. In selecting the Fund's investments, the Sub-Adviser seeks investments in companies that have the ability to pay increasing dividends through strong cash flow. The Sub-Adviser's approach looks for companies with an above-average rate of earnings growth and a lucrative niche in the economy that gives them the ability to sustain earnings momentum even during times of slow economic growth. The Sub-Adviser believes when a company increases its earnings faster than both inflation and the overall economy, the market will eventually reward it with a higher stock price. The Fund may sell securities for a variety of reasons, such as to secure gains, limit losses, or redeploy assets into more promising opportunities.&lt;br /&gt;&lt;br /&gt;In pursuing its investment objective, the Sub-Adviser has the discretion to purchase some securities that do not meet its normal investment criteria, as described above, when it perceives an unusual opportunity for gain. Those situations might arise when the Sub-Adviser believes a security could increase in value for a variety of reasons, including a change in management, an extraordinary corporate event, a new product introduction or innovation, or a favorable competitive development.&lt;br /&gt;&lt;br /&gt;While most assets will be invested in exchange-listed U.S. common stocks, other securities may also be purchased, including foreign stocks (up to 30% of total assets), convertible securities, and preferred stocks, in keeping with the Fund's objectives.</rr:StrategyNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000006732_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesLargeGrowthStockFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000006732_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesLargeGrowthStockFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000006732_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesLargeGrowthStockFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000006732_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesLargeGrowthStockFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000006732_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;LARGE GROWTH STOCK FUND&lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000006732_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000006732_Member">The investment objective of the Large Growth Stock Fund (the &amp;#8220;Fund&amp;#8221;) is to achieve long-term growth of capital and increase of future income.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000006732_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006732_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000006732_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000006727_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000006727_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006727_Member">Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in common stocks of U.S. companies with large market capitalizations. For purposes of this policy, large capitalization companies have market capitalizations of more than $3 billion at the time of purchase. The Sub-Adviser focuses on investing the Fund's assets in the stocks of companies it believes to have above average earnings growth potential compared to other companies (i.e., growth companies). Growth companies tend to have stock prices that are high relative to their earnings, dividends, book value, or other financial measures. While the Fund primarily invests in the common stocks of large capitalization companies, the Fund may invest a portion of its net assets (no more than 20%) in small and medium capitalization companies with market capitalizations of less than $3 billion at the time of purchase. The Fund also may invest up to 20% of its net assets in foreign securities at the time of purchase. The Fund may participate in initial public offerings ("IPOs").&lt;br /&gt;&lt;br /&gt;The Sub-Adviser uses a bottom-up investment approach to buying and selling investments for the Fund. Investments are selected primarily based on fundamental analysis of individual issuers and their potential in light of their financial condition, and market, economic, political, and regulatory conditions. Factors considered may include analysis of an issuer's earnings, cash flows, competitive position, and management ability. Quantitative models that systematically evaluate an issuer's valuation, price and earnings momentum, earnings quality, and other factors may also be considered.&lt;br /&gt;&lt;br /&gt;Due to its investment strategy, the Fund may buy and sell securities frequently, which may result in higher transaction costs and may lower fund performance.</rr:StrategyNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000006727_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesLargeCapGrowthFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000006727_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesLargeCapGrowthFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000006727_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesLargeCapGrowthFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000006727_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesLargeCapGrowthFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees contextRef="Duration_02May2014_01May2015S000022078_Member">The Total Annual Fund Operating Expenses in this fee table may not correlate to the expense ratios in the Fund's financial highlights and financial statements because the financial highlights and financial statements reflect only the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses, which are fees and expenses incurred indirectly by the Fund through its investments in certain underlying investment companies.</rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000022078_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund's average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000022078_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000022078_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:ExpensesRestatedToReflectCurrent contextRef="Duration_02May2014_01May2015S000022086_Member">The expense information in the table has been restated to reflect an increase in the Fund's Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</rr:ExpensesRestatedToReflectCurrent>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022076_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022076_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index and one additional index, the Barclays Capital U.S. Aggregate Bond Index. The Barclays Capital U.S. Aggregate Bond Index, in conjunction with the broad-based index, are used to track the broad range of allocations the Fund makes to the underlying funds. The foregoing indices, when considered together, may provide investors with a useful comparison of the Fund&amp;#8217;s overall performance. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000006729_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesRealEstateSecuritiesFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000006729_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesRealEstateSecuritiesFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000006729_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesRealEstateSecuritiesFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000006729_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesRealEstateSecuritiesFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022078_MemberC000063369_Member">2011-09-30</rr:BarChartLowestQuarterlyReturnDate>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006732_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022078_MemberC000063369_Member">&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000022086_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022078_MemberC000063369_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022078_MemberC000063369_Member">&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000006732_MemberC000018295_Member" decimals="INF" unitRef="USD">102</rr:ExpenseExampleYear01>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000022086_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000022086_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000006732_MemberC000018295_Member" decimals="INF" unitRef="USD">318</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000006732_MemberC000018295_Member" decimals="INF" unitRef="USD">552</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000006732_MemberC000018295_Member" decimals="INF" unitRef="USD">1225</rr:ExpenseExampleYear10>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000022076_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;17.31%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-16.51%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;6/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;9/30/2011&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022086_MemberC000063377_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022086_MemberC000063377_Member">2009-09-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022086_MemberC000063377_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000006732_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 38% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000006732_Member">&lt;b&gt;Principal Investment Strategy&lt;/b&gt;</rr:StrategyHeading>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000006732_Member">&lt;b&gt;Principal Risks of Investing&lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006732_Member">&lt;b&gt;Currency Risk.&lt;/b&gt; &amp;nbsp;The possibility that the value of the Fund&amp;#8217;s assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and restrictions or prohibitions on the repatriation of foreign currencies. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;&amp;#8220;Growth&amp;#8221; Investing Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in securities of companies perceived to be &amp;#8220;growth&amp;#8221; companies may underperform when value investing is in favor and may be more volatile than other securities because they are more sensitive to investor perceptions of the issuing company&amp;#8217;s growth of earnings potential. Also, because growth companies usually invest a high portion of earnings in their businesses, growth stocks may lack the dividends of some value stocks that can cushion stock prices in a falling market. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Large-Cap Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in larger companies may underperform relative to those of smaller companies. Larger more established companies may be unable to respond quickly to new competitive challenges such as changes in technology and consumer tastes and may not be able to attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Management Risk.&lt;/b&gt; &amp;nbsp;The possibility that the investment decisions, techniques, analyses or models implemented by the Fund&amp;#8217;s Sub-Adviser in seeking to achieve the Fund&amp;#8217;s investment objective may not produce the returns expected, may cause the Fund&amp;#8217;s shares to lose value or may cause the Fund to underperform relevant benchmarks or other funds with similar investment objectives. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt; &amp;nbsp;The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments. &lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of investing in common stocks in the hope of earning above-average long-term growth of capital and income.</rr:RiskNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006732_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022086_MemberC000063377_Member">2011-09-30</rr:BarChartLowestQuarterlyReturnDate>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006732_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000006732_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;19.01%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-23.79%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;3/31/2012&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;12/31/2008&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000006731_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 56% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006732_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000006731_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:ExpensesRestatedToReflectCurrent contextRef="Duration_02May2014_01May2015S000006735_Member">The expense information in the table has been restated to reflect an increase in the Fund&amp;#8217;s Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</rr:ExpensesRestatedToReflectCurrent>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000006731_Member">&lt;b&gt;Principal Risks of Investing &lt;/b&gt;</rr:RiskHeading>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022076_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006731_Member">&lt;b&gt;Bank Loans Risk.&lt;/b&gt; &amp;nbsp;The possibility that, to the extent the Fund invests in bank loans, it is exposed to additional risks beyond those associated with traditional debt securities, including liquidity risk, prepayment risk, extension risk, the risk of subordination to other creditors, restrictions on resale, and the lack of a regular trading market and publicly available information. In addition, liquidity risk may be more pronounced for a portfolio investing in loans because certain loans may have a more limited secondary market. These loans may be difficult to value. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Corporate Debt Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the issuer of a debt security held by the Fund is unable to meet its principal and interest payment obligations. The further possibility that corporate debt securities held by the Fund may experience increased price volatility due to such factors as market interest rates, market perception of the creditworthiness of the issuer and general market liquidity. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Credit Risk.&lt;/b&gt; &amp;nbsp;The possibility that an issuer of a debt security, or the counterparty to a derivatives contract, held by the Fund defaults on its payment obligations. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Credit Default Swap Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in credit default swaps may subject the Fund to greater risks than if the Fund were to invest directly in the reference obligation. Investing in credit default swaps exposes the Fund to the credit risk of both the counterparty to the credit default swap and the issuer of the underlying reference obligation. The Fund could realize a loss on its investment if it does not correctly evaluate the creditworthiness of the issuer of the bond or other reference obligation on which the credit default swap is based, as well as the continued creditworthiness of the counterparty. Investments in credit default swaps are also subject to liquidity risk. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Currency Risk.&lt;/b&gt; &amp;nbsp;The possibility that the value of the Fund&amp;#8217;s assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and restrictions or prohibitions on the repatriation of foreign currencies. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Derivatives Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s use of derivatives, such as futures, options and swap agreements, may lead to losses, including those magnified by leverage, particularly when derivatives are used to enhance return rather than mitigate risk. Certain derivative instruments may be difficult to sell when the Sub-Adviser believes it would be appropriate to do so, difficult to value if the instrument becomes illiquid, or the other party to a derivative contract may be unwilling or unable to fulfill its contractual obligations. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Fixed Income Market Risk.&lt;/b&gt; &amp;nbsp;The possibility that the market value of a fixed-income security may decline due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic conditions, changes in the outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. Fixed income securities markets may, in response to governmental intervention, economic or market developments (including potentially a reduction in the number of broker-dealers willing to engage in market-making activity), or other factors, experience periods of increased, and sometimes unpredictable, volatility and reduced liquidity. During those periods, the Fund may experience increased levels of shareholder redemptions, and may have to sell securities at inopportune times, and at unfavorable prices. Fixed income securities also may be difficult to value during such periods. In recent periods, governmental financial regulators, including the U.S. Federal Reserve, have taken steps to maintain historically low interest rates by purchasing bonds. Steps by those regulators to curtail or &amp;#8220;taper&amp;#8221; such activities could result in the effects described above, and could have a material adverse effect on prices for fixed income securities and on the management of the Fund. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;High Yield Bond Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investment in debt securities rated below investment grade (commonly known as junk bonds) may adversely affect the Fund&amp;#8217;s yield. Although these securities generally provide for higher yields than higher rated debt securities, the high degree of risk associated with these investments can result in substantial or total loss to the Fund. High yield securities are considered speculative and are subject to a greater risk of loss, greater sensitivity to interest rate changes, increased price volatility, valuation difficulties, and a potential lack of a liquid secondary or public market for the securities. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Interest Rate Risk.&lt;/b&gt; &amp;nbsp;The possibility that the prices of the Fund&amp;#8217;s fixed income investments will decline due to rising interest rates. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt; &amp;nbsp;The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Management Risk.&lt;/b&gt; &amp;nbsp;The possibility that the investment decisions, techniques, analyses or models implemented by the Fund&amp;#8217;s Sub-Adviser in seeking to achieve the Fund&amp;#8217;s investment objective may not produce the returns expected, may cause the Fund&amp;#8217;s shares to lose value or may cause the Fund to underperform relevant benchmarks or other funds with similar investment objectives. &lt;br /&gt;&lt;br /&gt;&lt;b&gt;Prepayment and Extension Risk.&lt;/b&gt; &amp;nbsp;The possibility that the principal on a fixed income security may be paid off earlier or later than expected causing the Fund to invest in fixed income securities with lower interest rates, which may adversely affect the Fund&amp;#8217;s performance. &lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for long-term, risk-oriented investors who are willing to accept the greater risks and uncertainties of investing in high yield bonds in the hope of earning high current income.</rr:RiskNarrativeTextBlock>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000022083_Member">&lt;b&gt;Example&lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000022083_Member">&lt;b&gt;Portfolio Turnover&lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022083_Member">Under normal circumstances, the Fund invests at least 80% of its net assets, plus the amount of any borrowings for investment purposes, in securities listed in the MSCI&lt;sup&gt;&amp;#174;&lt;/sup&gt; Europe, Australasia, Far East (MSCI EAFE) Index (the "Index"). Under normal circumstances, however, the Fund intends to invest substantially all of its assets in securities of companies included in the Index (including ADRs and Global Depositary Receipts ("GDRs")) and close substitutes (such as index futures contracts) that are designed to track the Index. The Index is an arithmetic, market value-weighted average of the performance of approximately 1,000 securities primarily from Europe, Australia, Asia and the Far East. The Fund may concentrate (invest 25% or more of the value of its assets) in the securities of issuers having their principal business activities in the same industry if the Index is also concentrated in such industry.&lt;br /&gt;&lt;br /&gt;The Sub-Adviser does not manage the Fund according to traditional methods of "active" investment management, which involve the buying and selling of securities based upon economic, financial and market analysis and investment judgment. Instead, the Sub-Adviser utilizes a "passive" investment approach, attempting to replicate the investment performance of its benchmark Index through automated statistical analytic procedures.&lt;br /&gt;&lt;br /&gt;The Sub-Adviser seeks to replicate the returns of the Index by investing in the securities of the Index in approximately their Index weight. However, under various circumstances, it may not be possible or practicable to purchase all of those securities in those weightings. In those circumstances, the Fund may purchase a sample of stocks in the Index in proportions expected to replicate generally the performance of the Index as a whole. In addition, from time to time, stocks are added to or removed from the Index. The Fund may sell stocks that are represented in the Index, or purchase stocks that are not yet represented in the Index, in anticipation of their removal from or addition to the Index.&lt;br /&gt;&lt;br /&gt;The Sub-Adviser may at times purchase or sell futures contracts in lieu of investment directly in the stocks making up the Index. The Sub-Adviser might do so, for example, in order to increase the Fund's investment exposure pending investment of cash in the stocks comprising the Index. Alternatively, the Sub-Adviser might use futures to reduce its investment exposure to the Index in situations where it intends to sell a portion of the stocks in the Fund's portfolio but the sale has not yet been completed. The Sub-Adviser may also enter into forward foreign currency exchange contracts in an attempt to match the Index's currency exposures.</rr:StrategyNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000022083_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesDevelopedInternationalIndexFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000022083_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesDevelopedInternationalIndexFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000022083_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesDevelopedInternationalIndexFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000022083_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesDevelopedInternationalIndexFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000006729_Member">&lt;b&gt;FUND SUMMARY:  &amp;nbsp;REAL ESTATE SECURITIES FUND&lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000006729_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000006729_Member">The investment objective of the Real Estate Securities Fund (the &amp;#8220;Fund&amp;#8221;) is to achieve a high total return consistent with reasonable investment risks.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000006729_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006729_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000006729_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000006729_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006729_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000006729_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000006729_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 54% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000006729_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000022084_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesEmergingMarketsEquityFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000022084_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesEmergingMarketsEquityFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000022084_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesEmergingMarketsEquityFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000022084_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesEmergingMarketsEquityFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006729_Member">Under normal circumstances, the Fund invests at least 80%, and normally substantially all, of its net assets, plus the amount of any borrowings for investment purposes, in common stocks and other equity securities issued by real estate companies, including real estate investment trusts (&amp;#8220;REITs&amp;#8221;). The Fund considers companies real estate companies if such companies (i) derive at least 50% of their revenues from the ownership, construction, financing, management or sale of commercial, industrial, or residential real estate; or (ii) have at least 50% of their assets in such real estate. REITs are companies that own interests in real estate or in real estate related loans or other interests, and their revenue primarily consists of rent derived from owned, income producing real estate properties and capital gains from the sale of such properties. A REIT in the U.S. is generally not taxed on income distributed to shareholders so long as it meets certain tax related requirements, including the requirement that it distribute substantially all of its taxable income to its shareholders. REIT-like entities are organized outside of the U.S. and have operations and receive foreign tax treatment similar to that of U.S. REITs. The Fund retains the ability to invest in real estate companies of any market capitalization. The Fund may invest up to 25% of its total assets in securities of foreign issuers which meet the same criteria for investment as domestic companies, or sponsored and unsponsored depositary receipts for such securities. Depositary receipts may take the form of ADRs, GDRs and EDRs. In managing the Fund&amp;#8217;s portfolio, the Sub-Adviser adheres to an integrated, bottom-up, relative value investment process.&lt;br /&gt;&lt;br /&gt;The Fund may buy and sell portfolio securities actively. If it does, its portfolio turnover rate and transaction costs will rise, which may lower Fund performance.</rr:StrategyNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000006729_Member">&lt;b&gt;Principal Risks of Investing &lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006729_Member">&lt;b&gt;Concentration Risk.&lt;/b&gt;&amp;nbsp;   The possibility that, to the extent the Fund invests to a significant extent in a particular industry or group of industries within a particular sector, the Fund may be subject to greater risks than if its investments were broadly diversified across industries and sectors. The Fund also is subject to loss due to adverse occurrences that may affect that industry or group of industries.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Currency Risk.&lt;/b&gt;&amp;nbsp;   The possibility that the value of the Fund&amp;#8217;s assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and restrictions or prohibitions on the repatriation of foreign currencies.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.&lt;/b&gt;&amp;nbsp;   The possibility that the Fund&amp;#8217;s investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Investment Style Risk.&lt;/b&gt;&amp;nbsp;   The possibility that the Fund could underperform if the Fund&amp;#8217;s investment style shifts out of favor based on changing market sentiment and conditions.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt;&amp;nbsp;   The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt;&amp;nbsp;   The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Portfolio Turnover Risk.&lt;/b&gt;&amp;nbsp;   The possibility that the Fund may frequently buy and sell portfolio securities, which may increase transaction costs to the Fund and cause the Fund&amp;#8217;s performance to be less than you expect.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Real Estate Securities Risk.&lt;/b&gt;&amp;nbsp;   The possibility that the Fund&amp;#8217;s investments in real estate securities, including REITs, may make the Fund more susceptible to the risks associated with direct investments in real estate. These risks include, among others, declines in the value of real estate; risks related to general and local economic conditions; changes in the availability, cost and terms of mortgage funds; loss of rental income due to vacancies; obsolescence of properties; overbuilding and increased competition; increases in property taxes and operating expenses; changes in zoning laws; defaults by borrowers or tenants, particularly during an economic downturn; and changes in interest rates. Any geographic concentration of the Fund&amp;#8217;s real estate-related investments could result in the Fund being subject to the above risks to a greater degree.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;REITs Risk.&lt;/b&gt;&amp;nbsp;   The possibility that the Fund&amp;#8217;s investments in REITs will subject the Fund to the risks associated with the direct ownership of real estate, including fluctuations in the value of underlying properties, changes in interest rates and risks related to general or local economic conditions. REITs are dependent upon management skills and generally may not be diversified. REITs are also subject to heavy cash flow dependency, defaults by borrowers or tenants and self-liquidation.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Small- and Mid-Cap Securities Risk.&lt;/b&gt;&amp;nbsp;   The possibility that the Fund&amp;#8217;s investments in small- and mid-cap securities may be subject to greater risk and higher volatility than are customarily associated with investing in larger more established companies. Securities issued by small- and mid-sized companies, which can include start-up companies, tend to be more vulnerable than larger and more established companies to adverse business and economic developments. Such companies generally have narrower product lines, more limited financial resources and more limited markets for their stock as compared with larger companies. As a result, the value of such securities also may be more volatile than the securities of larger companies, and the Fund&amp;#8217;s portfolio may experience difficulty in purchasing or selling such securities at the desired time and price or in the desired amount.&lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of real estate and real estate related investing in the hope of realizing capital appreciation while diversifying their investment portfolio.</rr:RiskNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006731_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006731_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000006731_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;18.08%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-17.56%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;6/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;12/31/2008&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006731_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000022086_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesLargeCoreValueFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000022086_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesLargeCoreValueFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000022086_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesLargeCoreValueFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000006732_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000022086_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesLargeCoreValueFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000006732_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006729_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006729_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. They represent the performance of the Fund&amp;#8217;s previous manager for the period prior to May 1, 2011. Since May 1, 2011, Cohen &amp;amp; Steers Capital Management, Inc. has been responsible for the Fund&amp;#8217;s day-to-day portfolio management. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000006732_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000006729_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;30.58%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-40.76%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;9/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;12/31/2008&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006729_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022076_MemberBarclaysCapitalUsAggregateBondIndex_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022076_MemberRussellThirtyHundredIndex_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022076_MemberC000063367_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000022084_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;EMERGING MARKETS EQUITY FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000022084_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000022084_Member">The investment objective of the Emerging Markets Equity Fund (the &amp;#8220;Fund&amp;#8221;) is to seek to achieve capital appreciation.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000022084_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022084_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000022084_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000022084_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022084_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000022084_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000022084_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 42% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000022084_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022084_Member">Under normal circumstances, the Fund invests at least 80% of its total assets in equity securities located in emerging market countries. For this Fund, an issuer is considered to be located in an emerging market country if, at the time of investment: (i) its principal securities trading market is in an emerging market country, (ii) alone or on a consolidated basis it derives 50% or more of its annual revenue from goods produced, sales made or services performed in emerging market countries, or (iii) it is organized under the laws of, or has a principal office in, an emerging market country. By applying this test, it is possible that a particular issuer could be deemed to be from more than one emerging market country. The Sub-Adviser will base determinations as to a company&amp;#8217;s eligibility on publicly available information and inquiries made to the company.&lt;br /&gt;&lt;br /&gt;The Sub-Adviser considers emerging market countries to be countries that major international financial institutions, such as the World Bank, or the Fund&amp;#8217;s benchmark index generally consider to be less economically mature than developed nations, such as the United States or most nations in Western Europe. Emerging market countries can include every nation in the world except the United States, Canada, Japan, Australia, New Zealand and most nations located in Western Europe. Allocation of the Fund&amp;#8217;s investments will depend upon the relative attractiveness of emerging countries and particular issuers. There are no prescribed limits on the geographic distribution of the Fund&amp;#8217;s investments.&lt;br /&gt;&lt;br /&gt;Currently, investing in issuers in many emerging countries is not feasible or may involve unacceptable political risks. The Fund emphasizes investment in those emerging countries whose economies are developing strongly and whose markets are becoming more sophisticated.&lt;br /&gt;&lt;br /&gt;The Sub-Adviser seeks to maximize returns by investing in growth-oriented equity securities of emerging country issuers. The Sub-Adviser combines top-down country criteria to allocate the Fund&amp;#8217;s assets among countries (based on relative economic, political and social fundamentals, stock valuations, and investor sentiment) with bottom-up fundamental analysis of issuers (seeking to identify issuers with strong earnings growth potential). Portfolio securities are typically sold when any one or more of these assessments materially changes. The Sub-Adviser attempts to manage the overall risk of its investments through its emphasis on thorough macroeconomic and fundamental research.&lt;br /&gt;&lt;br /&gt;The Fund invests primarily in equity securities, including common stocks and convertible securities. The Fund may invest in securities of micro-, small- and medium-capitalization companies. The Fund may invest in derivative instruments, principally futures, options, swaps and forward foreign currency exchange contracts. The Fund principally uses these derivative instruments for hedging, risk management, portfolio management and to earn income. The Fund may purchase securities of other investment companies. The Fund may invest up to 20% of its total assets in debt securities, including up to 5% of its total assets in non-investment grade debt securities (commonly known as &amp;#8220;junk bonds&amp;#8221;). The Fund may invest up to 10% of its total assets in foreign real estate companies.&lt;br /&gt;&lt;br /&gt;The Fund may buy and sell portfolio securities actively. If it does, its portfolio turnover rate and transaction costs will rise, which may lower Fund performance.</rr:StrategyNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000022084_Member">&lt;b&gt;Principal Risks of Investing &lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022084_Member">&lt;b&gt;Convertible Securities Risk.&lt;/b&gt;&amp;nbsp; The possibility that the value of the Fund&amp;#8217;s investments in convertible securities may be adversely affected by changes in interest rates, the credit of the issuer and the value of the underlying common stock. The market values of convertible securities tend to decline as interest rates increase and, conversely, to increase as interest rates decline. In addition, as the market price of the underlying common stock declines below the conversion price, the price of the convertible security tends to be increasingly influenced by the yield of the convertible security.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Corporate Debt Securities Risk.&lt;/b&gt;&amp;nbsp; The possibility that the issuer of a debt security held by the Fund is unable to meet its principal and interest payment obligations. The further possibility that corporate debt securities held by the Fund may experience increased price volatility due to such factors as market interest rates, market perception of the creditworthiness of the issuer and general market liquidity.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Credit Risk.&lt;/b&gt;&amp;nbsp; The possibility that an issuer of a debt security, or the counterparty to a derivatives contract, held by the Fund defaults on its payment obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Currency Risk.&lt;/b&gt;&amp;nbsp; The possibility that the value of the Fund&amp;#8217;s assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and restrictions or prohibitions on the repatriation of foreign currencies.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Derivatives Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s use of derivatives, such as futures, options and swap agreements, may lead to losses, including those magnified by leverage, particularly when derivatives are used to enhance return rather than mitigate risk. Certain derivative instruments may be difficult to sell when the Sub-Adviser believes it would be appropriate to do so, difficult to value if the instrument becomes illiquid, or the other party to a derivative contract may be unwilling or unable to fulfill its contractual obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Emerging Markets Risk.&lt;/b&gt;&amp;nbsp; The possibility that the stocks of companies located in emerging markets may be more volatile, and less liquid, than the stocks of companies located in the U.S. and developed foreign markets due to political, economic, or regulatory conditions within emerging market countries. In addition, emerging market countries may experience more volatile interest and currency exchange rates, higher levels of inflation and less efficient trading and settlement systems.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund&amp;#8217;s investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Real Estate Company Risk.&lt;/b&gt;&amp;nbsp;   The possibility that the Fund&amp;#8217;s investments in foreign real estate companies may make the Fund more susceptible to the risks associated with real estate investing and the real estate industry in general. Foreign real estate companies depend upon specialized management skills, may not be diversified, may have less trading volume, and may be subject to more abrupt or erratic price movements than the overall securities markets. Foreign real estate companies have their own expenses, and the Fund will bear a proportionate share of those expenses.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;High Yield Bond Risk.&lt;/b&gt;&amp;nbsp;   The possibility that the Fund&amp;#8217;s investment in debt securities rated below investment grade (commonly known as junk bonds) may adversely affect the Fund&amp;#8217;s yield. Although these securities generally provide for higher yields than higher rated debt securities, the high degree of risk associated with these investments can result in substantial or total loss to the Fund. High yield securities are considered speculative and are subject to a greater risk of loss, greater sensitivity to interest rate changes, increased price volatility, valuation difficulties, and a potential lack of a liquid secondary or public market for the securities.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Interest Rate Risk.&lt;/b&gt;&amp;nbsp;   The possibility that the prices of the Fund&amp;#8217;s convertible securities will decline due to rising interest rates.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Investment Style Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund could underperform if the Fund&amp;#8217;s investment style shifts out of favor based on changing market sentiment and conditions.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt;&amp;nbsp; The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt;&amp;nbsp;   The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Micro-Cap Securities Risk.&lt;/b&gt;&amp;nbsp;   The possibility that the return on the Fund&amp;#8217;s investments in micro-cap companies may be less than the return on investments in stocks of larger companies or the stock market as a whole. Stock prices of micro-cap companies may be based in substantial part on future expectations rather than current achievements and may move sharply, especially during market upturns and downturns. Micro-cap companies are followed by relatively few securities analysts, and there tends to be less publicly available information about these companies. Micro-cap companies are more likely to be newly formed or in the early stages of development, depend on a few key employees, and have relatively limited product lines, markets or financial resources compared to larger capitalization companies.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Other Investment Company Risk.&lt;/b&gt;&amp;nbsp; The possibility that investments by the Fund in shares of other investment companies will subject the Fund to the risks associated with those investment companies. Fund shareholders will also indirectly bear a proportionate share of any underlying investment company&amp;#8217;s fees and expenses in addition to paying the Fund&amp;#8217;s expenses.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Portfolio Turnover Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund may frequently buy and sell portfolio securities, which may increase transaction costs to the Fund and cause the Fund&amp;#8217;s performance to be less than you expect.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Prepayment and Extension Risk.&lt;/b&gt;&amp;nbsp; The possibility that the principal on a fixed income security may be paid off earlier or later than expected causing the Fund to invest in fixed income securities with lower interest rates, which may adversely affect the Fund&amp;#8217;s performance.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Small- and Mid-Cap Securities Risk.&lt;/b&gt;&amp;nbsp;   The possibility that the Fund&amp;#8217;s investments in small- and mid-cap securities may be subject to greater risk and higher volatility than are customarily associated with investing in larger more established companies. Securities issued by small- and mid-sized companies, which can include start-up companies, tend to be more vulnerable than larger and more established companies to adverse business and economic developments. Such companies generally have narrower product lines, more limited financial resources and more limited markets for their stock as compared with larger companies. As a result, the value of such securities also may be more volatile than the securities of larger companies, and the Fund&amp;#8217;s portfolio may experience difficulty in purchasing or selling such securities at the desired time and price or in the desired amount.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;U.S. Government Securities Risk.&lt;/b&gt;&amp;nbsp; The possibility that the U.S. government will not provide financial assistance in support of securities issued by certain of its agencies and instrumentalities and held by the Fund if it is not obligated to do because such securities are not issued or guaranteed by the U.S. Treasury. A default by a U.S. government agency or instrumentality could cause the Fund&amp;#8217;s share price or yield to fall.&lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of investing in emerging market equity securities in the hope of achieving capital appreciation.</rr:RiskNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022084_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022084_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022084_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000022084_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;34.74%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-19.38%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;6/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;9/30/2011&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000022083_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;DEVELOPED INTERNATIONAL INDEX FUND&lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ExpensesRestatedToReflectCurrent contextRef="Duration_02May2014_01May2015S000022076_Member">The expense information in the table has been restated to reflect an increase in the Fund's Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</rr:ExpensesRestatedToReflectCurrent>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000022083_Member">&lt;b&gt;Investment Objective&lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000022083_Member">The investment objective of the Developed International Index Fund (the &amp;#8220;Fund&amp;#8221;) is to seek to replicate the returns and characteristics of an international index composed of securities from developed countries.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000022083_Member">&lt;b&gt;Fund Fees and Expenses&lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022083_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000022083_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000006735_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index and one additional index, the MSCI ACWI (All Country World Index) ex-U.S. Index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:RiskLoseMoney contextRef="Duration_02May2014_01May2015S000022076_Member">You may lose money by investing in the Money Market Fund.</rr:RiskLoseMoney>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000006735_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000006735_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022083_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000022083_MemberC000063374_Member" decimals="INF" unitRef="USD">84</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000022083_MemberC000063374_Member" decimals="INF" unitRef="USD">262</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000022083_MemberC000063374_Member" decimals="INF" unitRef="USD">455</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000022083_MemberC000063374_Member" decimals="INF" unitRef="USD">1014</rr:ExpenseExampleYear10>
  <rr:RiskMoneyMarketFund contextRef="Duration_02May2014_01May2015S000022076_Member">Although the Money Market Fund seeks to preserve the value of your investment at $1.00 per share, there is no guarantee that the Money Market Fund will be able to do so.</rr:RiskMoneyMarketFund>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000022083_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 7% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000022083_Member">&lt;b&gt;Principal Investment Strategy&lt;/b&gt;</rr:StrategyHeading>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006735_MemberC000018298_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006735_MemberC000018298_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006735_MemberC000018298_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006735_MemberC000018298_Member">2008-09-30</rr:BarChartLowestQuarterlyReturnDate>
  <rr:ExpensesRestatedToReflectCurrent contextRef="Duration_02May2014_01May2015S000006732_Member">The expense information in the table has been restated to reflect an increase in the Fund's Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</rr:ExpensesRestatedToReflectCurrent>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000022083_Member">&lt;b&gt;Principal Risks of Investing&lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022083_Member">&lt;b&gt;Concentration Risk.&lt;/b&gt; &amp;nbsp;The possibility that, to the extent the Fund invests to a significant extent in a particular industry or group of industries within a particular sector, the Fund may be subject to greater risks than if its investments were broadly diversified across industries and sectors. The Fund also is subject to loss due to adverse occurrences that may affect that industry or group of industries.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Currency Risk.&lt;/b&gt; &amp;nbsp;The possibility that the value of the Fund&amp;#8217;s assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and restrictions or prohibitions on the repatriation of foreign currencies.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Depositary Receipt Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in foreign companies through depositary receipts will expose the Fund to the same risks as direct investment in securities of foreign issuers. In addition, investments in ADRs and GDRs may be less liquid than the underlying shares in their primary trading market, and the value of securities underlying ADRs and GDRs may change materially at times when U.S. markets are not open for trading.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Derivatives Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s use of derivatives, such as futures, options and swap agreements, may lead to losses, including those magnified by leverage, particularly when derivatives are used to enhance return rather than mitigate risk. Certain derivative instruments may be difficult to sell when the Sub-Adviser believes it would be appropriate to do so, difficult to value if the instrument becomes illiquid, or the other party to a derivative contract may be unwilling or unable to fulfill its contractual obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Investment Style Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund could underperform if the Fund&amp;#8217;s investment style shifts out of favor based on changing market sentiment and conditions.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt; &amp;nbsp;The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt; &amp;nbsp;The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Passive Investment Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s return may be lower than the return of an actively managed fund because the Fund holds shares of a security based on the holdings of its benchmark index, not the current or projected performance of a security, industry or sector. The Fund does not take defensive positions under any market conditions, including declining markets.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Sampling Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund may not hold all of the securities included in its benchmark index and that the securities selected for the Fund, in the aggregate, will not provide investment performance matching that of the Fund&amp;#8217;s benchmark index.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Tracking Error Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s performance may deviate from that of the benchmark index it seeks to track. This risk may be heightened during times of increased market volatility or other unusual market conditions.&lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of investing in international securities in the hope of achieving returns similar to that of the Index.</rr:RiskNarrativeTextBlock>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006732_MemberC000018295_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006732_MemberC000018295_Member">2012-03-31</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006732_MemberC000018295_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006732_MemberC000018295_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000022076_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index and one additional index, the Barclays Capital U.S. Aggregate Bond Index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformanceAdditionalMarketIndex contextRef="Duration_02May2014_01May2015S000022076_Member">The Barclays Capital U.S. Aggregate Bond Index, in conjunction with the broad-based index, are used to track the broad range of allocations the Fund makes to the underlying funds. The foregoing indices, when considered together, may provide investors with a useful comparison of the Fund&amp;#8217;s overall performance.</rr:PerformanceAdditionalMarketIndex>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000022076_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000022076_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022083_Member">&lt;b&gt;Performance Information&lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022083_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000022083_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;25.12%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-20.12%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;6/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;9/30/2011&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022083_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000006729_MemberC000018292_Member" decimals="INF" unitRef="USD">99</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000006729_MemberC000018292_Member" decimals="INF" unitRef="USD">309</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000006729_MemberC000018292_Member" decimals="INF" unitRef="USD">536</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000006729_MemberC000018292_Member" decimals="INF" unitRef="USD">1190</rr:ExpenseExampleYear10>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000006731_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000006731_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000006731_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022083_MemberMsciEafeIndex_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022083_MemberC000063374_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022076_MemberC000063367_Member">&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022076_MemberC000063367_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022076_MemberC000063367_Member">&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022076_MemberC000063367_Member">2011-09-30</rr:BarChartLowestQuarterlyReturnDate>
  <rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees contextRef="Duration_02May2014_01May2015S000022081_Member">The Total Annual Fund Operating Expenses in this fee table may not correlate to the expense ratios in the Fund's financial highlights and financial statements because the financial highlights and financial statements reflect only the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses, which are fees and expenses incurred indirectly by the Fund through its investments in certain underlying investment companies.</rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006731_MemberC000018294_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006731_MemberC000018294_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006731_MemberC000018294_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006731_MemberC000018294_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000022081_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000022081_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000022081_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022081_MemberC000063372_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022081_MemberC000063372_Member">2009-09-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022081_MemberC000063372_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022081_MemberC000063372_Member">2009-03-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000022083_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund's average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000022083_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000022083_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022083_MemberC000063374_Member">&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022083_MemberC000063374_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022083_MemberC000063374_Member">&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022083_MemberC000063374_Member">2011-09-30</rr:BarChartLowestQuarterlyReturnDate>
  <rr:ExpensesRestatedToReflectCurrent contextRef="Duration_02May2014_01May2015S000006731_Member">The expense information in the table has been restated to reflect an increase in the Fund&amp;#8217;s Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</rr:ExpensesRestatedToReflectCurrent>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000006727_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;17.05%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-26.16%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;3/31/2012&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;12/31/2008&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022084_MemberC000063375_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022084_MemberMsciEmergingMarketsIndex_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000022077_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000022077_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022077_Member">The Fund seeks to achieve its investment objective by using a "fund-of-funds" strategy. Accordingly, the Fund invests in a combination of other Penn Series Funds (each, an "underlying fund" and, collectively, the "underlying funds") in accordance with its target asset allocations. These underlying funds invest their assets directly in equity, fixed income, money market and other securities in accordance with their own investment objectives and policies. The underlying funds are managed using both indexed and active management strategies.&lt;br /&gt;&lt;br /&gt;The Fund has its own distinct target portfolio allocation and is designed to accommodate specific investment goals and risk tolerances. Through its investments in the underlying funds, the Fund's target allocation is intended to allocate the Fund's assets among various asset classes, such as equity securities, fixed income securities and money market securities. The portfolio of the Fund is more heavily allocated to bonds and cash investments, and reflects a moderately conservative approach.&lt;br /&gt;&lt;br /&gt;In determining the asset allocation of the Fund, the Adviser will rely on the experience of its investment personnel and its evaluation of the overall financial markets, including, but not limited to, information about the economy, interest rates, and the long-term absolute and relative returns of various asset classes. Consideration will also be given to the investment styles of the managers of the underlying funds and their historic patterns of performance relative to their asset class and to other underlying funds. Periodic changes in allocations among the underlying funds will be based on information about the financial markets, changes within particular underlying funds, or the introduction of new Penn Series Funds that would, in the Adviser's opinion, enhance the return potential of the Fund. These changes will be implemented as necessary, recognizing that these decisions tend to be long-term in nature, based on information about the financial markets and on the Fund's investment objective.&lt;br /&gt;&lt;br /&gt;The following chart shows the Fund's target asset allocation among the various asset classes. The Adviser may permit modest deviations from the target asset allocations listed below. Accordingly, the Fund's actual allocations may differ from this illustration.&lt;br/&gt;&lt;br/&gt;&lt;table cellspacing="0" cellpadding="0" width="70%" border="0" style="border-collapse:collapse"&gt; &lt;tr&gt; &lt;td width="47%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="24%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center" style="border-left:1px solid #000000; border-top:1px solid #000000; border-bottom:1px solid #000000; padding-left:8px"&gt;&lt;b&gt;Asset Class&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom" style="border-left:1px solid #000000; border-top:1px solid #000000; border-bottom:1px solid #000000"&gt;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center" style="border-top:1px solid #000000; border-right:1px solid #000000; border-bottom:1px solid #000000; padding-right:8px"&gt;&lt;b&gt;Target Asset Allocation&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" style="border-left:1px solid #000000; border-bottom:1px solid #000000; padding-left:8px"&gt;&lt;b&gt;Equity Funds&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom" style="border-left:1px solid #000000; border-bottom:1px solid #000000"&gt;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center" style="border-right:1px solid #000000; border-bottom:1px solid #000000"&gt;30% - 50%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" style="border-left:1px solid #000000; border-bottom:1px solid #000000; padding-left:8px"&gt;&lt;b&gt;Fixed Income and Money Market Funds&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom" style="border-left:1px solid #000000; border-bottom:1px solid #000000"&gt;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center" style="border-right:1px solid #000000; border-bottom:1px solid #000000"&gt;50% - 70%&lt;/td&gt;&lt;/tr&gt; &lt;/table&gt;&lt;br /&gt;The Adviser reserves the right to modify the Fund's target asset allocations and to substitute other underlying funds and add additional underlying funds from time to time should circumstances warrant a change. The Adviser may periodically rebalance the Fund's investments in the underlying funds to bring the Fund back within its target range.</rr:StrategyNarrativeTextBlock>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022077_Member">&lt;b&gt;Asset Allocation Risk.  &lt;/b&gt;&amp;nbsp;The possibility that the Fund may underperform other funds with similar investment objectives due to the Fund's allocation of assets to underlying funds investing in asset classes or market sectors that perform poorly relative to other asset categories.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.  &lt;/b&gt;&amp;nbsp;The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Underlying Fund Investment Risk.  &lt;/b&gt;&amp;nbsp;The possibility that the underperformance of an underlying fund may contribute to the underperformance of the Fund. The Fund's performance and risks will be directly related to the performance and risks of the underlying funds in which it invests. In addition, the Fund indirectly pays a pro rata portion of the expenses incurred by the underlying funds, which also may lower the Fund's performance.&lt;blockquote&gt;&lt;b&gt;Corporate Debt Securities Risk.  &lt;/b&gt;&amp;nbsp;The possibility that the issuer of a debt security held by an underlying fund is unable to meet its principal and interest payment obligations. The further possibility that corporate debt securities held by an underlying fund may experience increased price volatility due to such factors as market interest rates, market perception of the creditworthiness of the issuer and general market liquidity.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Credit Risk.  &lt;/b&gt;&amp;nbsp;The possibility that an issuer of a debt security, or the counterparty to a derivatives contract, held by an underlying fund defaults on its payment obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Derivatives Risk.  &lt;/b&gt;&amp;nbsp;The possibility that an underlying fund's use of derivatives, such as futures, options and swap agreements, may lead to losses, including those magnified by leverage, particularly when derivatives are used to enhance return rather than mitigate risk. Certain derivative instruments may be difficult to sell when the Adviser or Sub-Adviser of the underlying fund believes it would be appropriate to do so, difficult to value if the instrument becomes illiquid, or the other party to a derivative contract may be unwilling or unable to fulfill its contractual obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.  &lt;/b&gt;&amp;nbsp;The possibility that an underlying fund's investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;"Growth" Investing Risk.  &lt;/b&gt;&amp;nbsp;The possibility that an underlying fund's investments in securities of companies perceived to be "growth" companies may underperform when value investing is in favor and may be more volatile than other securities because they are more sensitive to investor perceptions of the issuing company's growth of earnings potential. Also, because growth companies usually invest a high portion of earnings in their businesses, growth stocks may lack the dividends of some value stocks that can cushion stock prices in a falling market.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;High Yield Bond Risk.  &lt;/b&gt;&amp;nbsp;The possibility that an underlying fund's investment in debt securities rated below investment grade (commonly known as junk bonds) may adversely affect the underlying fund's yield. Although these securities generally provide for higher yields than higher rated debt securities, the high degree of risk associated with these investments can result in substantial or total loss to the underlying fund. High yield securities are considered speculative and are subject to a greater risk of loss, greater sensitivity to interest rate changes, increased price volatility, valuation difficulties, and a potential lack of a liquid secondary or public market for the securities.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Interest Rate Risk.  &lt;/b&gt;&amp;nbsp;The possibility that the prices of an underlying fund's fixed income investments will decline due to rising interest rates.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Investment Risk.  &lt;/b&gt;&amp;nbsp;You may lose money by investing in the Money Market Fund. Although the Money Market Fund seeks to preserve the value of your investment at $1.00 per share, there is no guarantee that the Money Market Fund will be able to do so.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Large-Cap Securities Risk.  &lt;/b&gt;&amp;nbsp;The possibility that an underlying fund's investments in larger companies may underperform relative to those of smaller companies. Larger more established companies may be unable to respond quickly to new competitive challenges such as changes in technology and consumer tastes and may not be able to attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.  &lt;/b&gt;&amp;nbsp;The possibility that the market for certain of an underlying fund's investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for an underlying fund to purchase a desired investment at an advantageous price under such circumstances.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Portfolio Turnover Risk.  &lt;/b&gt;&amp;nbsp;The possibility that an underlying fund may frequently buy and sell portfolio securities, which may increase transaction costs to the underlying fund and cause the underlying fund's performance to be less than you expect.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Prepayment and Extension Risk.  &lt;/b&gt;&amp;nbsp;The possibility that the principal on a fixed income security may be paid off earlier or later than expected causing an underlying fund to invest in fixed income securities with lower interest rates, which may adversely affect the underlying fund's performance.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Small- and Mid-Cap Securities Risk.  &lt;/b&gt;&amp;nbsp;The possibility that an underlying fund's investments in small- and mid-cap securities may be subject to greater risk and higher volatility than are customarily associated with investing in larger more established companies. Securities issued by small- and mid-sized companies, which can include start-up companies, tend to be more vulnerable than larger and more established companies to adverse business and economic developments. Such companies generally have narrower product lines, more limited financial resources and more limited markets for their stock as compared with larger companies. As a result, the value of such securities also may be more volatile than the securities of larger companies, and an underlying fund's portfolio may experience difficulty in purchasing or selling such securities at the desired time and price or in the desired amount.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;U.S. Government Securities Risk.  &lt;/b&gt;&amp;nbsp;The possibility that the U.S. government will not provide financial assistance in support of securities issued by certain of its agencies and instrumentalities and held by an underlying fund if it is not obligated to do because such securities are not issued or guaranteed by the U.S. Treasury. A default by a U.S. government agency or instrumentality could cause an underlying fund's share price or yield to fall.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;"Value" Investing Risk.  &lt;/b&gt;&amp;nbsp;The possibility that an underlying fund's investments in securities perceived to be undervalued may not realize their perceived value for extended periods of time or may never realize their perceived value. The securities in which an underlying fund invests may respond differently to market and other developments than other types of securities, and may underperform growth stocks and/or the market as a whole.&lt;/blockquote&gt;</rr:RiskNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000022077_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesModeratelyConservativeAllocationFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000022077_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesModeratelyConservativeAllocationFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000022077_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesModeratelyConservativeAllocationFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000022077_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesModeratelyConservativeAllocationFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000006727_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 25% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000006727_Member">&lt;b&gt;Principal Investment Strategy&lt;/b&gt;</rr:StrategyHeading>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000006727_Member">&lt;b&gt;Principal Risks of Investing&lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006727_Member">&lt;b&gt;Currency Risk.&lt;/b&gt; &amp;nbsp;The possibility that the value of the Fund&amp;#8217;s assets may be affected favorably or unfavorably by currency exchange rates, currency exchange control regulations, and restrictions or prohibitions on the repatriation of foreign currencies.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;&amp;#8220;Growth&amp;#8221; Investing Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in securities of companies perceived to be &amp;#8220;growth&amp;#8221; companies may underperform when value investing is in favor and may be more volatile than other securities because they are more sensitive to investor perceptions of the issuing company&amp;#8217;s growth of earnings potential. Also, because growth companies usually invest a high portion of earnings in their businesses, growth stocks may lack the dividends of some value stocks that can cushion stock prices in a falling market.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;IPOs Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s performance may be affected by the purchase of securities issued in initial public offerings (IPOs) that have little to no trading history, limited issuer information, increased volatility and may not be available to the extent desired. The prices of securities bought in IPOs may rise and fall rapidly, often because of investor perceptions rather than economic reasons.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Large-Cap Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in larger companies may underperform relative to those of smaller companies. Larger more established companies may be unable to respond quickly to new competitive challenges such as changes in technology and consumer tastes and may not be able to attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt; &amp;nbsp;The possibility that the market for certain of the Fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for the Fund to purchase a desired investment at an advantageous price under such circumstances.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Management Risk.&lt;/b&gt; &amp;nbsp;The possibility that the investment decisions, techniques, analyses or models implemented by the Fund&amp;#8217;s Sub-Adviser in seeking to achieve the Fund&amp;#8217;s investment objective may not produce the returns expected, may cause the Fund&amp;#8217;s shares to lose value or may cause the Fund to underperform relevant benchmarks or other funds with similar investment objectives.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt; &amp;nbsp;The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Portfolio Turnover Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund may frequently buy and sell portfolio securities, which may increase transaction costs to the Fund and cause the Fund&amp;#8217;s performance to be less than you expect.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Small- and Mid-Cap Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund&amp;#8217;s investments in small- and mid-cap securities may be subject to greater risk and higher volatility than are customarily associated with investing in larger more established companies. Securities issued by small- and mid-sized companies, which can include start-up companies, tend to be more vulnerable than larger and more established companies to adverse business and economic developments. Such companies generally have narrower product lines, more limited financial resources and more limited markets for their stock as compared with larger companies. As a result, the value of such securities also may be more volatile than the securities of larger companies, and the Fund&amp;#8217;s portfolio may experience difficulty in purchasing or selling such securities at the desired time and price or in the desired amount.&lt;br /&gt;&lt;br /&gt;An investment in the Fund may be appropriate for investors who are willing to accept the risks and uncertainties of investing in common stocks in the hope of long-term capital appreciation.</rr:RiskNarrativeTextBlock>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000022077_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;MODERATELY CONSERVATIVE ALLOCATION FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006727_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006727_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. They represent the performance of the Fund&amp;#8217;s previous managers for the period prior to May 1, 2013. Since May 1, 2013, Massachusetts Financial Services Company has been responsible for the Fund&amp;#8217;s day-to-day portfolio management. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006727_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000022077_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000022077_Member">The investment objective of the Moderately Conservative Allocation Fund (the &amp;#8220;Fund&amp;#8221;) is to seek to achieve long-term capital growth and current income consistent with its asset allocation strategy.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000022077_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022077_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000022077_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000022081_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesBalancedFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000006727_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000006727_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000006727_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. They represent the performance of the Fund&amp;#8217;s previous managers for the period prior to May 1, 2013. Since May 1, 2013, Massachusetts Financial Services Company has been responsible for the Fund&amp;#8217;s day-to-day portfolio management. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022081_MemberC000063372_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:StrategyPortfolioConcentration contextRef="Duration_02May2014_01May2015S000006729_Member">Under normal circumstances, the Fund invests at least 80%, and normally substantially all, of its net assets, plus the amount of any borrowings for investment purposes, in common stocks and other equity securities issued by real estate companies, including real estate investment trusts (&amp;#8220;REITs&amp;#8221;).</rr:StrategyPortfolioConcentration>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000006729_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. They represent the performance of the Fund&amp;#8217;s previous manager for the period prior to May 1, 2011. Since May 1, 2011, Cohen &amp;amp; Steers Capital Management, Inc. has been responsible for the Fund&amp;#8217;s day-to-day portfolio management. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000006729_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000006729_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:RiskMoneyMarketFund contextRef="Duration_02May2014_01May2015S000022081_Member">Although the Money Market Fund seeks to preserve the value of your investment at $1.00 per share, there is no guarantee that the Money Market Fund will be able to do so.</rr:RiskMoneyMarketFund>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000022088_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000022088_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022088_Member">The Fund seeks to achieve its investment objective by using a "fund-of-funds" strategy. Accordingly, the Fund invests in a combination of other Penn Series Funds (each, an "underlying fund" and, collectively, the "underlying funds") in accordance with its target asset allocations. These underlying funds invest their assets directly in equity, fixed income, money market and other securities in accordance with their own investment objectives and policies. The underlying funds are managed using both indexed and active management strategies.&lt;br /&gt;&lt;br /&gt;The Fund has its own distinct target portfolio allocation and is designed to accommodate specific investment goals and risk tolerances. Through its investments in the underlying funds, the Fund's target allocation is intended to allocate the Fund's assets among various asset classes, such as equity securities, fixed income securities and money market securities. The portfolio of the Fund is more heavily allocated to stocks, and reflects a moderately aggressive approach.&lt;br /&gt;&lt;br /&gt;In determining the asset allocation of the Fund, the Adviser will rely on the experience of its investment personnel and its evaluation of the overall financial markets, including, but not limited to, information about the economy, interest rates, and the long-term absolute and relative returns of various asset classes. Consideration will also be given to the investment styles of the managers of the underlying funds and their historic patterns of performance relative to their asset class and to other underlying funds. Periodic changes in allocations among the underlying funds will be based on information about the financial markets, changes within particular underlying funds, or the introduction of new Penn Series Funds that would, in the Adviser's opinion, enhance the return potential of the Fund. These changes will be implemented as necessary, recognizing that these decisions tend to be long-term in nature, based on information about the financial markets and on the Fund's investment objective.&lt;br /&gt;&lt;br /&gt;The following chart shows the Fund's target asset allocation among the various asset classes. The Adviser may permit modest deviations from the target asset allocations listed below. Accordingly, the Fund's actual allocations may differ from this illustration.&lt;br /&gt;&lt;br /&gt;&lt;table cellspacing="0" cellpadding="0" width="70%" border="0" style="border-collapse:collapse"&gt; &lt;tr&gt; &lt;td width="47%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="24%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center" style="border-left:1px solid #000000; border-top:1px solid #000000; border-bottom:1px solid #000000; padding-left:8px"&gt;&lt;b&gt;Asset Class&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom" style="border-left:1px solid #000000; border-top:1px solid #000000; border-bottom:1px solid #000000"&gt;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center" style="border-top:1px solid #000000; border-right:1px solid #000000; border-bottom:1px solid #000000; padding-right:8px"&gt;&lt;b&gt;Target Asset Allocation&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" style="border-left:1px solid #000000; border-bottom:1px solid #000000; padding-left:8px"&gt;&lt;b&gt;Equity Funds&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom" style="border-left:1px solid #000000; border-bottom:1px solid #000000"&gt;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center" style="border-right:1px solid #000000; border-bottom:1px solid #000000"&gt;70% - 100%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" style="border-left:1px solid #000000; border-bottom:1px solid #000000; padding-left:8px"&gt;&lt;b&gt;Fixed Income and Money Market Funds&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom" style="border-left:1px solid #000000; border-bottom:1px solid #000000"&gt;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center" style="border-right:1px solid #000000; border-bottom:1px solid #000000"&gt;0% - 30%&lt;/td&gt;&lt;/tr&gt; &lt;/table&gt;&lt;br /&gt;The Adviser reserves the right to modify the Fund's target asset allocations and to substitute other underlying funds and add additional underlying funds from time to time should circumstances warrant a change. The Adviser may periodically rebalance the Fund's investments in the underlying funds to bring the Fund back within its target range.</rr:StrategyNarrativeTextBlock>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022088_Member">&lt;b&gt;Asset Allocation Risk.&lt;/b&gt;&amp;nbsp;  The possibility that the Fund may underperform other funds with similar investment objectives due to the Fund's allocation of assets to underlying funds investing in asset classes or market sectors that perform poorly relative to other asset categories.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt;&amp;nbsp;  The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Underlying Fund Investment Risk.&lt;/b&gt;&amp;nbsp;  The possibility that the underperformance of an underlying fund may contribute to the underperformance of the Fund. The Fund's performance and risks will be directly related to the performance and risks of the underlying funds in which it invests. In addition, the Fund indirectly pays a pro rata portion of the expenses incurred by the underlying funds, which also may lower the Fund's performance.&lt;blockquote&gt;&lt;b&gt;Corporate Debt Securities Risk.&lt;/b&gt;&amp;nbsp;  The possibility that the issuer of a debt security held by an underlying fund is unable to meet its principal and interest payment obligations. The further possibility that corporate debt securities held by an underlying fund may experience increased price volatility due to such factors as market interest rates, market perception of the creditworthiness of the issuer and general market liquidity.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Credit Risk.&lt;/b&gt;&amp;nbsp;  The possibility that an issuer of a debt security, or the counterparty to a derivatives contract, held by an underlying fund defaults on its payment obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Derivatives Risk.&lt;/b&gt;&amp;nbsp;  The possibility that an underlying fund's use of derivatives, such as futures, options and swap agreements, may lead to losses, including those magnified by leverage, particularly when derivatives are used to enhance return rather than mitigate risk. Certain derivative instruments may be difficult to sell when the Adviser or Sub-Adviser of the underlying fund believes it would be appropriate to do so, difficult to value if the instrument becomes illiquid, or the other party to a derivative contract may be unwilling or unable to fulfill its contractual obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.&lt;/b&gt;&amp;nbsp;  The possibility that an underlying fund's investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;"Growth" Investing Risk.&lt;/b&gt;&amp;nbsp;  The possibility that an underlying fund's investments in securities of companies perceived to be "growth" companies may underperform when value investing is in favor and may be more volatile than other securities because they are more sensitive to investor perceptions of the issuing company's growth of earnings potential. Also, because growth companies usually invest a high portion of earnings in their businesses, growth stocks may lack the dividends of some value stocks that can cushion stock prices in a falling market.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;High Yield Bond Risk.&lt;/b&gt;&amp;nbsp;  The possibility that an underlying fund's investment in debt securities rated below investment grade (commonly known as junk bonds) may adversely affect the underlying fund's yield. Although these securities generally provide for higher yields than higher rated debt securities, the high degree of risk associated with these investments can result in substantial or total loss to the underlying fund. High yield securities are considered speculative and are subject to a greater risk of loss, greater sensitivity to interest rate changes, increased price volatility, valuation difficulties, and a potential lack of a liquid secondary or public market for the securities.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Interest Rate Risk.&lt;/b&gt;&amp;nbsp;  The possibility that the prices of an underlying fund's fixed income investments will decline due to rising interest rates.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Investment Risk.&lt;/b&gt;&amp;nbsp;  You may lose money by investing in the Money Market Fund. Although the Money Market Fund seeks to preserve the value of your investment at $1.00 per share, there is no guarantee that the Money Market Fund will be able to do so.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Large-Cap Securities Risk.&lt;/b&gt;&amp;nbsp;  The possibility that an underlying fund's investments in larger companies may underperform relative to those of smaller companies. Larger more established companies may be unable to respond quickly to new competitive challenges such as changes in technology and consumer tastes and may not be able to attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt;&amp;nbsp;  The possibility that the market for certain of an underlying fund's investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for an underlying fund to purchase a desired investment at an advantageous price under such circumstances.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Portfolio Turnover Risk.&lt;/b&gt;&amp;nbsp;  The possibility that an underlying fund may frequently buy and sell portfolio securities, which may increase transaction costs to the underlying fund and cause the underlying fund's performance to be less than you expect.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Prepayment and Extension Risk.&lt;/b&gt;&amp;nbsp;  The possibility that the principal on a fixed income security may be paid off earlier or later than expected causing an underlying fund to invest in fixed income securities with lower interest rates, which may adversely affect the underlying fund's performance.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Small- and Mid-Cap Securities Risk.&lt;/b&gt;&amp;nbsp;  The possibility that an underlying fund's investments in small- and mid-cap securities may be subject to greater risk and higher volatility than are customarily associated with investing in larger more established companies. Securities issued by small- and mid-sized companies, which can include start-up companies, tend to be more vulnerable than larger and more established companies to adverse business and economic developments. Such companies generally have narrower product lines, more limited financial resources and more limited markets for their stock as compared with larger companies. As a result, the value of such securities also may be more volatile than the securities of larger companies, and an underlying fund's portfolio may experience difficulty in purchasing or selling such securities at the desired time and price or in the desired amount.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;U.S. Government Securities Risk.&lt;/b&gt;&amp;nbsp;  The possibility that the U.S. government will not provide financial assistance in support of securities issued by certain of its agencies and instrumentalities and held by an underlying fund if it is not obligated to do because such securities are not issued or guaranteed by the U.S. Treasury. A default by a U.S. government agency or instrumentality could cause an underlying fund's share price or yield to fall.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;"Value" Investing Risk.&lt;/b&gt;&amp;nbsp;  The possibility that an underlying fund's investments in securities perceived to be undervalued may not realize their perceived value for extended periods of time or may never realize their perceived value. The securities in which an underlying fund invests may respond differently to market and other developments than other types of securities, and may underperform growth stocks and/or the market as a whole.&lt;/blockquote&gt;</rr:RiskNarrativeTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000022088_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesModeratelyAggressiveAllocationFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000022088_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesModeratelyAggressiveAllocationFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000022088_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesModeratelyAggressiveAllocationFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000022088_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesModeratelyAggressiveAllocationFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006727_MemberC000018290_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006727_MemberC000018290_Member">2012-03-31</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006727_MemberC000018290_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006727_MemberC000018290_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees contextRef="Duration_02May2014_01May2015S000022076_Member">The Total Annual Fund Operating Expenses in this fee table may not correlate to the expense ratios in the Fund's financial highlights and financial statements because the financial highlights and financial statements reflect only the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses, which are fees and expenses incurred indirectly by the Fund through its investments in certain underlying investment companies.</rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006729_MemberC000018292_Member">&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006729_MemberC000018292_Member">2009-09-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000022088_Member">&lt;b&gt;FUND SUMMARY:  &amp;nbsp;MODERATELY AGGRESSIVE ALLOCATION FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000006729_MemberC000018292_Member">&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000006729_MemberC000018292_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000022084_MemberC000063375_Member" decimals="INF" unitRef="USD">172</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000022084_MemberC000063375_Member" decimals="INF" unitRef="USD">533</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000022084_MemberC000063375_Member" decimals="INF" unitRef="USD">918</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000022084_MemberC000063375_Member" decimals="INF" unitRef="USD">1998</rr:ExpenseExampleYear10>
  <rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination contextRef="Duration_02May2014_01May2015S000006727_Member">April 30, 2016</rr:FeeWaiverOrReimbursementOverAssetsDateOfTermination>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006727_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000022084_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000006727_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;LARGE CAP GROWTH FUND&lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000006727_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000006727_Member">The investment objective of the Large Cap Growth Fund (the &amp;#8220;Fund&amp;#8221;) is to seek long-term capital appreciation.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000006727_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000006727_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000006727_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000022084_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000022084_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000006727_MemberC000018290_Member" decimals="INF" unitRef="USD">91</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000006727_MemberC000018290_Member" decimals="INF" unitRef="USD">284</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000006727_MemberC000018290_Member" decimals="INF" unitRef="USD">493</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000006727_MemberC000018290_Member" decimals="INF" unitRef="USD">1096</rr:ExpenseExampleYear10>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000022088_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000022088_Member">The investment objective of the Moderately Aggressive Allocation Fund (the &amp;#8220;Fund&amp;#8221;) is to seek to achieve long-term capital growth and current income consistent with its asset allocation strategy.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000022088_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022077_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022088_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000022088_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000022077_MemberC000063368_Member" decimals="INF" unitRef="USD">110</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000022077_MemberC000063368_Member" decimals="INF" unitRef="USD">343</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000022077_MemberC000063368_Member" decimals="INF" unitRef="USD">595</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000022077_MemberC000063368_Member" decimals="INF" unitRef="USD">1317</rr:ExpenseExampleYear10>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022088_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000022088_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 17% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000022077_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 20% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000022088_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022084_MemberC000063375_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022084_MemberC000063375_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022084_MemberC000063375_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022084_MemberC000063375_Member">2011-09-30</rr:BarChartLowestQuarterlyReturnDate>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000022077_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000022077_Member">&lt;b&gt;Principal Risks &lt;/b&gt;</rr:RiskHeading>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000022088_Member">&lt;b&gt;Principal Risks &lt;/b&gt;</rr:RiskHeading>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022077_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022077_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index and one additional index, the Russell 3000&lt;sup&gt;&amp;#174;&lt;/sup&gt; Index. The Russell 3000&lt;sup&gt;&amp;#174;&lt;/sup&gt; Index, in conjunction with the broad-based index, are used to track the broad range of allocations the Fund makes to the underlying funds. The foregoing indices, when considered together, may provide investors with a useful comparison of the Fund&amp;#8217;s overall performance. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000022077_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;8.62%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-5.34%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;6/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;9/30/2011&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022077_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022077_MemberC000063368_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022077_MemberBarclaysCapitalUsAggregateBondIndex_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022077_MemberRussellThirtyHundredIndex_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022088_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022088_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index and one additional index, the Barclays Capital U.S. Aggregate Bond Index. The Barclays Capital U.S. Aggregate Bond Index, in conjunction with the broad-based index, are used to track the broad range of allocations the Fund makes to the underlying funds. The foregoing indices, when considered together, may provide investors with a useful comparison of the Fund&amp;#8217;s overall performance. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000022088_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;14.52%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-13.53%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;9/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;9/30/2011&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022088_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:ExpensesRestatedToReflectCurrent contextRef="Duration_02May2014_01May2015S000022077_Member">The expense information in the table has been restated to reflect an increase in the Fund's Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</rr:ExpensesRestatedToReflectCurrent>
  <rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees contextRef="Duration_02May2014_01May2015S000022077_Member">The Total Annual Fund Operating Expenses in this fee table may not correlate to the expense ratios in the Fund's financial highlights and financial statements because the financial highlights and financial statements reflect only the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses, which are fees and expenses incurred indirectly by the Fund through its investments in certain underlying investment companies.</rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees>
  <rr:RiskLoseMoney contextRef="Duration_02May2014_01May2015S000022077_Member">You may lose money by investing in the Money Market Fund.</rr:RiskLoseMoney>
  <rr:RiskMoneyMarketFund contextRef="Duration_02May2014_01May2015S000022077_Member">Although the Money Market Fund seeks to preserve the value of your investment at $1.00 per share, there is no guarantee that the Money Market Fund will be able to do so.</rr:RiskMoneyMarketFund>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000022077_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index and one additional index, the Russell 3000&lt;sup&gt;&amp;#174;&lt;/sup&gt; Index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000022088_MemberC000063379_Member" decimals="INF" unitRef="USD">125</rr:ExpenseExampleYear01>
  <rr:PerformanceAdditionalMarketIndex contextRef="Duration_02May2014_01May2015S000022077_Member">The Russell 3000&lt;sup&gt;&amp;#174;&lt;/sup&gt; Index, in conjunction with the broad-based index, are used to track the broad range of allocations the Fund makes to the underlying funds. The foregoing indices, when considered together, may provide investors with a useful comparison of the Fund&amp;#8217;s overall performance.</rr:PerformanceAdditionalMarketIndex>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000022088_MemberC000063379_Member" decimals="INF" unitRef="USD">390</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000022088_MemberC000063379_Member" decimals="INF" unitRef="USD">676</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000022088_MemberC000063379_Member" decimals="INF" unitRef="USD">1489</rr:ExpenseExampleYear10>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000022077_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000022077_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022077_MemberC000063368_Member">&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022088_MemberC000063379_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022088_MemberRussellThirtyHundredIndex_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022088_MemberBarclaysCapitalUsAggregateBondIndex_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022077_MemberC000063368_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022077_MemberC000063368_Member">&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022077_MemberC000063368_Member">2011-09-30</rr:BarChartLowestQuarterlyReturnDate>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000022082_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesConservativeAllocationFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000022082_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesConservativeAllocationFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000022082_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesConservativeAllocationFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:ExpensesRestatedToReflectCurrent contextRef="Duration_02May2014_01May2015S000022088_Member">The expense information in the table has been restated to reflect an increase in the Fund&amp;#8217;s Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</rr:ExpensesRestatedToReflectCurrent>
  <rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees contextRef="Duration_02May2014_01May2015S000022088_Member">The Total Annual Fund Operating Expenses in this fee table may not correlate to the expense ratios in the Fund&amp;#8217;s financial highlights and financial statements because the financial highlights and financial statements reflect only the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses, which are fees and expenses incurred indirectly by the Fund through its investments in certain underlying investment companies.</rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees>
  <rr:RiskLoseMoney contextRef="Duration_02May2014_01May2015S000022088_Member">You may lose money by investing in the Money Market Fund.</rr:RiskLoseMoney>
  <rr:RiskMoneyMarketFund contextRef="Duration_02May2014_01May2015S000022088_Member">Although the Money Market Fund seeks to preserve the value of your investment at $1.00 per share, there is no guarantee that the Money Market Fund will be able to do so.</rr:RiskMoneyMarketFund>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_02May2014_01May2015S000022087_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualFundOperatingExpensesPennSeriesModerateAllocationFund column period compact * ~&lt;/div&gt;</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_02May2014_01May2015S000022087_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleExpenseExampleTransposedPennSeriesModerateAllocationFund column period compact * ~&lt;/div&gt;</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000022087_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesModerateAllocationFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_02May2014_01May2015S000022087_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAverageAnnualTotalReturnsTransposedPennSeriesModerateAllocationFund column period compact * ~&lt;/div&gt;</rr:PerformanceTableTextBlock>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000022088_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index and one additional index, the Barclays Capital U.S. Aggregate Bond Index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformanceAdditionalMarketIndex contextRef="Duration_02May2014_01May2015S000022088_Member">The Barclays Capital U.S. Aggregate Bond Index, in conjunction with the broad-based index, are used to track the broad range of allocations the Fund makes to the underlying funds. The foregoing indices, when considered together, may provide investors with a useful comparison of the Fund&amp;#8217;s overall performance.</rr:PerformanceAdditionalMarketIndex>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000022088_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000022088_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022088_MemberC000063379_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022088_MemberC000063379_Member">2009-09-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022088_MemberC000063379_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022088_MemberC000063379_Member">2011-09-30</rr:BarChartLowestQuarterlyReturnDate>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000022087_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;MODERATE ALLOCATION FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000022087_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000022087_Member">The investment objective of the Moderate Allocation Fund (the &amp;#8220;Fund&amp;#8221;) is to seek to achieve long-term capital growth and current income consistent with its asset allocation strategy.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000022087_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022087_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000022087_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000022087_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022087_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000022087_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000022087_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 17% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000022087_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022087_Member">The Fund seeks to achieve its investment objective by using a &amp;#8220;fund-of-funds&amp;#8221; strategy. Accordingly, the Fund invests in a combination of other Penn Series Funds (each, an &amp;#8220;underlying fund&amp;#8221; and, collectively, the &amp;#8220;underlying funds&amp;#8221;) in accordance with its target asset allocations. These underlying funds invest their assets directly in equity, fixed income, money market and other securities in accordance with their own investment objectives and policies. The underlying funds are managed using both indexed and active management strategies.&lt;br /&gt;&lt;br /&gt;The Fund has its own distinct target portfolio allocation and is designed to accommodate specific investment goals and risk tolerances. Through its investments in the underlying funds, the Fund&amp;#8217;s target allocation is intended to allocate the Fund&amp;#8217;s assets among various asset classes, such as equity securities, fixed income securities and money market securities. The portfolio of the Fund is allocated among stock, bond and cash investments with a majority of its assets allocated to stocks, and is designed to offer investors an investment option that is less aggressive than the Penn Series Aggressive Allocation and Moderately Aggressive Allocation Funds, but more aggressive than the Penn Series Moderately Conservative Allocation and Conservative Allocation Funds.&lt;br /&gt;&lt;br /&gt;In determining the asset allocation of the Fund, the Adviser will rely on the experience of its investment personnel and its evaluation of the overall financial markets, including, but not limited to, information about the economy, interest rates, and the long-term absolute and relative returns of various asset classes. Consideration will also be given to the investment styles of the managers of the underlying funds and their historic patterns of performance relative to their asset class and to other underlying funds. Periodic changes in allocations among the underlying funds will be based on information about the financial markets, changes within particular underlying funds, or the introduction of new Penn Series Funds that would, in the Adviser&amp;#8217;s opinion, enhance the return potential of the Fund. These changes will be implemented as necessary, recognizing that these decisions tend to be long-term in nature, based on information about the financial markets and on the Fund&amp;#8217;s investment objective.&lt;br /&gt;&lt;br /&gt;The following chart shows the Fund&amp;#8217;s target asset allocation among the various asset classes. The Adviser may permit modest deviations from the target asset allocations listed below. Accordingly, the Fund&amp;#8217;s actual allocations may differ from this illustration.&lt;br /&gt;&lt;br /&gt;&lt;table cellspacing="0" cellpadding="0" width="70%" border="0" style="border-collapse:collapse"&gt; &lt;tr&gt; &lt;td width="47%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="24%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center" style="border-left:1px solid #000000; border-top:1px solid #000000; border-bottom:1px solid #000000; padding-left:8px"&gt;&lt;b&gt;Asset Class&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom" style="border-left:1px solid #000000; border-top:1px solid #000000; border-bottom:1px solid #000000"&gt;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center" style="border-top:1px solid #000000; border-right:1px solid #000000; border-bottom:1px solid #000000; padding-right:8px"&gt;&lt;b&gt;Target Asset Allocation&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" style="border-left:1px solid #000000; border-bottom:1px solid #000000; padding-left:8px"&gt;&lt;b&gt;Equity Funds&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom" style="border-left:1px solid #000000; border-bottom:1px solid #000000"&gt;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center" style="border-right:1px solid #000000; border-bottom:1px solid #000000"&gt;50% - 70%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" style="border-left:1px solid #000000; border-bottom:1px solid #000000; padding-left:8px"&gt;&lt;b&gt;Fixed Income and Money Market Funds&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom" style="border-left:1px solid #000000; border-bottom:1px solid #000000"&gt;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center" style="border-right:1px solid #000000; border-bottom:1px solid #000000"&gt;30% - 50%&lt;/td&gt;&lt;/tr&gt; &lt;/table&gt;&lt;br /&gt;&lt;br /&gt;The Adviser reserves the right to modify the Fund&amp;#8217;s target asset allocations and to substitute other underlying funds and add additional underlying funds from time to time should circumstances warrant a change. The Adviser may periodically rebalance the Fund&amp;#8217;s investments in the underlying funds to bring the Fund back within its target range.</rr:StrategyNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000022087_Member">&lt;b&gt;Principal Risks &lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022087_Member">&lt;b&gt;Asset Allocation Risk.&lt;/b&gt;&amp;nbsp; The possibility that the Fund may underperform other funds with similar investment objectives due to the Fund&amp;#8217;s allocation of assets to underlying funds investing in asset classes or market sectors that perform poorly relative to other asset categories.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt;&amp;nbsp; The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Underlying Fund Investment Risk.&lt;/b&gt;&amp;nbsp; The possibility that the underperformance of an underlying fund may contribute to the underperformance of the Fund. The Fund&amp;#8217;s performance and risks will be directly related to the performance and risks of the underlying funds in which it invests. In addition, the Fund indirectly pays a pro rata portion of the expenses incurred by the underlying funds, which also may lower the Fund&amp;#8217;s performance.&lt;blockquote&gt;&lt;b&gt;Corporate Debt Securities Risk.&lt;/b&gt;&amp;nbsp; The possibility that the issuer of a debt security held by an underlying fund is unable to meet its principal and interest payment obligations. The further possibility that corporate debt securities held by an underlying fund may experience increased price volatility due to such factors as market interest rates, market perception of the creditworthiness of the issuer and general market liquidity.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Credit Risk.&lt;/b&gt;&amp;nbsp; The possibility that an issuer of a debt security, or the counterparty to a derivatives contract, held by an underlying fund defaults on its payment obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Derivatives Risk.&lt;/b&gt;&amp;nbsp; The possibility that an underlying fund&amp;#8217;s use of derivatives, such as futures, options and swap agreements, may lead to losses, including those magnified by leverage, particularly when derivatives are used to enhance return rather than mitigate risk. Certain derivative instruments may be difficult to sell when the Adviser or Sub-Adviser of the underlying fund believes it would be appropriate to do so, difficult to value if the instrument becomes illiquid, or the other party to a derivative contract may be unwilling or unable to fulfill its contractual obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.&lt;/b&gt;&amp;nbsp; The possibility that an underlying fund&amp;#8217;s investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;&amp;#8220;Growth&amp;#8221; Investing Risk.&lt;/b&gt;&amp;nbsp; The possibility that an underlying fund&amp;#8217;s investments in securities of companies perceived to be &amp;#8220;growth&amp;#8221; companies may underperform when value investing is in favor and may be more volatile than other securities because they are more sensitive to investor perceptions of the issuing company&amp;#8217;s growth of earnings potential. Also, because growth companies usually invest a high portion of earnings in their businesses, growth stocks may lack the dividends of some value stocks that can cushion stock prices in a falling market.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;High Yield Bond Risk.&lt;/b&gt;&amp;nbsp; The possibility that an underlying fund&amp;#8217;s investment in debt securities rated below investment grade (commonly known as junk bonds) may adversely affect the underlying fund&amp;#8217;s yield. Although these securities generally provide for higher yields than higher rated debt securities, the high degree of risk associated with these investments can result in substantial or total loss to the underlying fund. High yield securities are considered speculative and are subject to a greater risk of loss, greater sensitivity to interest rate changes, increased price volatility, valuation difficulties, and a potential lack of a liquid secondary or public market for the securities.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Interest Rate Risk.&lt;/b&gt;&amp;nbsp; The possibility that the prices of an underlying fund&amp;#8217;s fixed income investments will decline due to rising interest rates.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Investment Risk.&lt;/b&gt;&amp;nbsp; You may lose money by investing in the Money Market Fund. Although the Money Market Fund seeks to preserve the value of your investment at $1.00 per share, there is no guarantee that the Money Market Fund will be able to do so.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Large-Cap Securities Risk.&lt;/b&gt;&amp;nbsp; The possibility that an underlying fund&amp;#8217;s investments in larger companies may underperform relative to those of smaller companies. Larger more established companies may be unable to respond quickly to new competitive challenges such as changes in technology and consumer tastes and may not be able to attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt;&amp;nbsp; The possibility that the market for certain of an underlying fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for an underlying fund to purchase a desired investment at an advantageous price under such circumstances.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Portfolio Turnover Risk.&lt;/b&gt;&amp;nbsp; The possibility that an underlying fund may frequently buy and sell portfolio securities, which may increase transaction costs to the underlying fund and cause the underlying fund&amp;#8217;s performance to be less than you expect.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Prepayment and Extension Risk.&lt;/b&gt;&amp;nbsp; The possibility that the principal on a fixed income security may be paid off earlier or later than expected causing an underlying fund to invest in fixed income securities with lower interest rates, which may adversely affect the underlying fund&amp;#8217;s performance.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Small- and Mid-Cap Securities Risk.&lt;/b&gt;&amp;nbsp; The possibility that an underlying fund&amp;#8217;s investments in small- and mid-cap securities may be subject to greater risk and higher volatility than are customarily associated with investing in larger more established companies. Securities issued by small- and mid-sized companies, which can include start-up companies, tend to be more vulnerable than larger and more established companies to adverse business and economic developments. Such companies generally have narrower product lines, more limited financial resources and more limited markets for their stock as compared with larger companies. As a result, the value of such securities also may be more volatile than the securities of larger companies, and an underlying fund&amp;#8217;s portfolio may experience difficulty in purchasing or selling such securities at the desired time and price or in the desired amount.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;U.S. Government Securities Risk.&lt;/b&gt;&amp;nbsp; The possibility that the U.S. government will not provide financial assistance in support of securities issued by certain of its agencies and instrumentalities and held by an underlying fund if it is not obligated to do because such securities are not issued or guaranteed by the U.S. Treasury. A default by a U.S. government agency or instrumentality could cause an underlying fund&amp;#8217;s share price or yield to fall.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;&amp;#8220;Value&amp;#8221; Investing Risk.&lt;/b&gt;&amp;nbsp; The possibility that an underlying fund&amp;#8217;s investments in securities perceived to be undervalued may not realize their perceived value for extended periods of time or may never realize their perceived value. The securities in which an underlying fund invests may respond differently to market and other developments than other types of securities, and may underperform growth stocks and/or the market as a whole.&lt;/blockquote&gt;
</rr:RiskNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022087_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022087_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index and one additional index, the Barclays Capital U.S. Aggregate Bond Index. The Barclays Capital U.S. Aggregate Bond Index, in conjunction with the broad-based index, are used to track the broad range of allocations the Fund makes to the underlying funds. The foregoing indices, when considered together, may provide investors with a useful comparison of the Fund&amp;#8217;s overall performance. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022087_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:ObjectiveHeading contextRef="Duration_02May2014_01May2015S000022082_Member">&lt;b&gt;Investment Objective &lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_02May2014_01May2015S000022082_Member">The investment objective of the Conservative Allocation Fund (the &amp;#8220;Fund&amp;#8221;) is to seek to achieve long-term capital growth and current income consistent with its asset allocation strategy.</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseHeading contextRef="Duration_02May2014_01May2015S000022082_Member">&lt;b&gt;Fund Fees and Expenses &lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022082_Member">This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. Additional fees and expenses will be applied at the variable contract level. Those fees and expenses are described in your variable contract prospectus. If the information below were to reflect the deduction of variable contract charges, fees and expenses would be higher.</rr:ExpenseNarrativeTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_02May2014_01May2015S000022082_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:ExpenseExampleHeading contextRef="Duration_02May2014_01May2015S000022082_Member">&lt;b&gt;Example &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022082_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the 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 Fund&amp;#8217;s operating expenses remain the same. Although your actual costs and returns might be higher or lower, based on these assumptions your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverHeading contextRef="Duration_02May2014_01May2015S000022082_Member">&lt;b&gt;Portfolio Turnover &lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_02May2014_01May2015S000022082_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; its portfolio). A higher portfolio turnover may indicate higher transaction costs. These costs, which are not reflected in the annual fund operating expenses or in the Example, affect the Fund&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 26% of the average value of its portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_02May2014_01May2015S000022082_Member">&lt;b&gt;Principal Investment Strategy &lt;/b&gt;</rr:StrategyHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022082_Member">The Fund seeks to achieve its investment objective by using a &amp;#8220;fund-of-funds&amp;#8221; strategy. Accordingly, the Fund invests in a combination of other Penn Series Funds (each, an &amp;#8220;underlying fund&amp;#8221; and, collectively, the &amp;#8220;underlying funds&amp;#8221;) in accordance with its target asset allocations. These underlying funds invest their assets directly in equity, fixed income, money market and other securities in accordance with their own investment objectives and policies. The underlying funds are managed using both indexed and active management strategies.&lt;br /&gt;&lt;br /&gt;The Fund has its own distinct target portfolio allocation and is designed to accommodate specific investment goals and risk tolerances. Through its investments in the underlying funds, the Fund&amp;#8217;s target allocation is intended to allocate the Fund&amp;#8217;s assets among various asset classes, such as equity securities, fixed income securities and money market securities. The portfolio of the Fund is more heavily allocated to bonds and cash investments, and reflects a conservative approach.&lt;br /&gt;&lt;br /&gt;In determining the asset allocation of the Fund, the Adviser will rely on the experience of its investment personnel and its evaluation of the overall financial markets, including, but not limited to, information about the economy, interest rates, and the long-term absolute and relative returns of various asset classes. Consideration will also be given to the investment styles of the managers of the underlying funds and their historic patterns of performance relative to their asset class and to other underlying funds. Periodic changes in allocations among the underlying funds will be based on information about the financial markets, changes within particular underlying funds, or the introduction of new Penn Series Funds that would, in the Adviser&amp;#8217;s opinion, enhance the return potential of the Fund. These changes will be implemented as necessary, recognizing that these decisions tend to be long-term in nature, based on information about the financial markets and on the Fund&amp;#8217;s investment objective.&lt;br /&gt;&lt;br /&gt;The following chart shows the Fund&amp;#8217;s target asset allocation among the various asset classes. The Adviser may permit modest deviations from the target asset allocations listed below. Accordingly, the Fund&amp;#8217;s actual allocations may differ from this illustration.&lt;br/&gt;&lt;br/&gt;&lt;table cellspacing="0" cellpadding="0" width="70%" border="0" style="border-collapse:collapse"&gt; &lt;tr&gt; &lt;td width="47%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="24%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center" style="border-left:1px solid #000000; border-top:1px solid #000000; border-bottom:1px solid #000000; padding-left:8px"&gt;&lt;b&gt;Asset Class&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom" style="border-left:1px solid #000000; border-top:1px solid #000000; border-bottom:1px solid #000000"&gt;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center" style="border-top:1px solid #000000; border-right:1px solid #000000; border-bottom:1px solid #000000; padding-right:8px"&gt;&lt;b&gt;Target Asset Allocation&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" style="border-left:1px solid #000000; border-bottom:1px solid #000000; padding-left:8px"&gt;&lt;b&gt;Equity Funds&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom" style="border-left:1px solid #000000; border-bottom:1px solid #000000"&gt;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center" style="border-right:1px solid #000000; border-bottom:1px solid #000000"&gt;20% - 40%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" style="border-left:1px solid #000000; border-bottom:1px solid #000000; padding-left:8px"&gt;&lt;b&gt;Fixed Income and Money Market Funds&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom" style="border-left:1px solid #000000; border-bottom:1px solid #000000"&gt;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center" style="border-right:1px solid #000000; border-bottom:1px solid #000000"&gt;60% - 80%&lt;/td&gt;&lt;/tr&gt; &lt;/table&gt;&lt;br /&gt;&lt;br /&gt;&lt;br /&gt;The Adviser reserves the right to modify the Fund's target asset allocations and to substitute other underlying funds and add additional underlying funds from time to time should circumstances warrant a change. The Adviser may periodically rebalance the Fund's investments in the underlying funds to bring the Fund back within its target range.</rr:StrategyNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_02May2014_01May2015S000022082_Member">&lt;b&gt;Principal Risks &lt;/b&gt;</rr:RiskHeading>
  <rr:RiskNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022082_Member">&lt;b&gt;Asset Allocation Risk.&lt;/b&gt; &amp;nbsp;The possibility that the Fund may underperform other funds with similar investment objectives due to the Fund&amp;#8217;s allocation of assets to underlying funds investing in asset classes or market sectors that perform poorly relative to other asset categories.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Market Risk.&lt;/b&gt; &amp;nbsp;The possibility that the values of, and/or the income generated by, securities held by the Fund may decline, sometimes unpredictably, due to general market conditions or other factors, including those directly involving the issuers of such securities. Security markets are volatile and may decline significantly in response to adverse issuer, regulatory, political, or economic developments. Different sectors of the market and different security types may react differently to such developments.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Underlying Fund Investment Risk.&lt;/b&gt; &amp;nbsp;The possibility that the underperformance of an underlying fund may contribute to the underperformance of the Fund. The Fund&amp;#8217;s performance and risks will be directly related to the performance and risks of the underlying funds in which it invests. In addition, the Fund indirectly pays a pro rata portion of the expenses incurred by the underlying funds, which also may lower the Fund&amp;#8217;s performance.&lt;blockquote&gt;&lt;b&gt;Corporate Debt Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the issuer of a debt security held by an underlying fund is unable to meet its principal and interest payment obligations. The further possibility that corporate debt securities held by an underlying fund may experience increased price volatility due to such factors as market interest rates, market perception of the creditworthiness of the issuer and general market liquidity.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Credit Risk.&lt;/b&gt;&amp;nbsp; The possibility that an issuer of a debt security, or the counterparty to a derivatives contract, held by an underlying fund defaults on its payment obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Derivatives Risk.&lt;/b&gt; &amp;nbsp;The possibility that an underlying fund&amp;#8217;s use of derivatives, such as futures, options and swap agreements, may lead to losses, including those magnified by leverage, particularly when derivatives are used to enhance return rather than mitigate risk. Certain derivative instruments may be difficult to sell when the Adviser or Sub-Adviser of the underlying fund believes it would be appropriate to do so, difficult to value if the instrument becomes illiquid, or the other party to a derivative contract may be unwilling or unable to fulfill its contractual obligations.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Foreign Investment Risk.&lt;/b&gt; &amp;nbsp;The possibility that an underlying fund&amp;#8217;s investments in foreign securities may be adversely affected by political, social, and economic conditions affecting foreign issuers, greater volatility, reduced liquidity, or decreases in foreign currency values relative to the U.S. dollar.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;&amp;#8220;Growth&amp;#8221; Investing Risk.&lt;/b&gt; &amp;nbsp;The possibility that an underlying fund&amp;#8217;s investments in securities of companies perceived to be &amp;#8220;growth&amp;#8221; companies may underperform when value investing is in favor and may be more volatile than other securities because they are more sensitive to investor perceptions of the issuing company&amp;#8217;s growth of earnings potential. Also, because growth companies usually invest a high portion of earnings in their businesses, growth stocks may lack the dividends of some value stocks that can cushion stock prices in a falling market.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;High Yield Bond Risk.&lt;/b&gt;&amp;nbsp; The possibility that an underlying fund&amp;#8217;s investment in debt securities rated below investment grade (commonly known as junk bonds) may adversely affect the underlying fund&amp;#8217;s yield. Although these securities generally provide for higher yields than higher rated debt securities, the high degree of risk associated with these investments can result in substantial or total loss to the underlying fund. High yield securities are considered speculative and are subject to a greater risk of loss, greater sensitivity to interest rate changes, increased price volatility, valuation difficulties, and a potential lack of a liquid secondary or public market for the securities.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Interest Rate Risk.&lt;/b&gt; &amp;nbsp;The possibility that the prices of an underlying fund&amp;#8217;s fixed income investments will decline due to rising interest rates.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Investment Risk.&lt;/b&gt; &amp;nbsp;You may lose money by investing in the Money Market Fund. Although the Money Market Fund seeks to preserve the value of your investment at $1.00 per share, there is no guarantee that the Money Market Fund will be able to do so.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Large-Cap Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that an underlying fund&amp;#8217;s investments in larger companies may underperform relative to those of smaller companies. Larger more established companies may be unable to respond quickly to new competitive challenges such as changes in technology and consumer tastes and may not be able to attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Liquidity Risk.&lt;/b&gt; &amp;nbsp;The possibility that the market for certain of an underlying fund&amp;#8217;s investments may become illiquid under adverse or volatile market or economic conditions, making those investments difficult to sell at an advantageous price. The market price of certain investments may fall dramatically if there is no liquid trading market for the investments. It also may be difficult for an underlying fund to purchase a desired investment at an advantageous price under such circumstances.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Portfolio Turnover Risk.&lt;/b&gt; &amp;nbsp;The possibility that an underlying fund may frequently buy and sell portfolio securities, which may increase transaction costs to the underlying fund and cause the underlying fund&amp;#8217;s performance to be less than you expect.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Prepayment and Extension Risk.&lt;/b&gt; &amp;nbsp;The possibility that the principal on a fixed income security may be paid off earlier or later than expected causing an underlying fund to invest in fixed income securities with lower interest rates, which may adversely affect the underlying fund&amp;#8217;s performance.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;Small- and Mid-Cap Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that an underlying fund&amp;#8217;s investments in small- and mid-cap securities may be subject to greater risk and higher volatility than are customarily associated with investing in larger more established companies. Securities issued by small- and mid-sized companies, which can include start-up companies, tend to be more vulnerable than larger and more established companies to adverse business and economic developments. Such companies generally have narrower product lines, more limited financial resources and more limited markets for their stock as compared with larger companies. As a result, the value of such securities also may be more volatile than the securities of larger companies, and an underlying fund&amp;#8217;s portfolio may experience difficulty in purchasing or selling such securities at the desired time and price or in the desired amount.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;U.S. Government Securities Risk.&lt;/b&gt; &amp;nbsp;The possibility that the U.S. government will not provide financial assistance in support of securities issued by certain of its agencies and instrumentalities and held by an underlying fund if it is not obligated to do because such securities are not issued or guaranteed by the U.S. Treasury. A default by a U.S. government agency or instrumentality could cause an underlying fund&amp;#8217;s share price or yield to fall.&lt;br /&gt;&lt;br /&gt;&lt;b&gt;&amp;#8220;Value&amp;#8221; Investing Risk.&lt;/b&gt;&amp;nbsp; The possibility that an underlying fund&amp;#8217;s investments in securities perceived to be undervalued may not realize their perceived value for extended periods of time or may never realize their perceived value. The securities in which an underlying fund invests may respond differently to market and other developments than other types of securities, and may underperform growth stocks and/or the market as a whole.&lt;/blockquote&gt;</rr:RiskNarrativeTextBlock>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022082_Member">&lt;b&gt;Performance Information &lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_02May2014_01May2015S000022082_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index and one additional index, the Russell 3000&lt;sup&gt;&amp;#174;&lt;/sup&gt; Index. The Russell 3000&lt;sup&gt;&amp;#174;&lt;/sup&gt; Index, in conjunction with the broad-based index, are used to track the broad range of allocations the Fund makes to the underlying funds. The foregoing indices, when considered together, may provide investors with a useful comparison of the Fund&amp;#8217;s overall performance. Past performance does not necessarily indicate how the Fund will perform in the future. This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:PerformanceNarrativeTextBlock>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000022082_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;5.26%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-1.37%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;6/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;9/30/2011&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000022082_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member" decimals="INF" unitRef="USD">102</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member" decimals="INF" unitRef="USD">318</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member" decimals="INF" unitRef="USD">552</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member" decimals="INF" unitRef="USD">1225</rr:ExpenseExampleYear10>
  <rr:ExpenseExampleYear01 contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member" decimals="INF" unitRef="USD">117</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member" decimals="INF" unitRef="USD">365</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member" decimals="INF" unitRef="USD">633</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member" decimals="INF" unitRef="USD">1398</rr:ExpenseExampleYear10>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022087_MemberBarclaysCapitalUsAggregateBondIndex_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022087_MemberRussellThirtyHundredIndex_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022082_MemberBarclaysCapitalUsAggregateBondIndex_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:AverageAnnualReturnInceptionDate contextRef="Duration_02May2014_01May2015S000022082_MemberRussellThirtyHundredIndex_Member">2008-08-25</rr:AverageAnnualReturnInceptionDate>
  <rr:RiskMoneyMarketFund contextRef="Duration_02May2014_01May2015S000022082_Member">Although the Money Market Fund seeks to preserve the value of your investment at $1.00 per share, there is no guarantee that the Money Market Fund will be able to do so.</rr:RiskMoneyMarketFund>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000022082_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index and one additional index, the Russell 3000&lt;sup&gt;&amp;#174;&lt;/sup&gt; Index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformanceAdditionalMarketIndex contextRef="Duration_02May2014_01May2015S000022082_Member">The Russell 3000&lt;sup&gt;&amp;#174;&lt;/sup&gt; Index, in conjunction with the broad-based index, are used to track the broad range of allocations the Fund makes to the underlying funds. The foregoing indices, when considered together, may provide investors with a useful comparison of the Fund&amp;#8217;s overall performance.</rr:PerformanceAdditionalMarketIndex>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000022082_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000022082_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:ExpensesRestatedToReflectCurrent contextRef="Duration_02May2014_01May2015S000022082_Member">The expense information in the table has been restated to reflect an increase in the Fund's Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</rr:ExpensesRestatedToReflectCurrent>
  <rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees contextRef="Duration_02May2014_01May2015S000022082_Member">The Total Annual Fund Operating Expenses in this fee table may not correlate to the expense ratios in the Fund&amp;#8217;s financial highlights and financial statements because the financial highlights and financial statements reflect only the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses, which are fees and expenses incurred indirectly by the Fund through its investments in certain underlying investment companies.</rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member">&lt;b&gt;Best Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member">&lt;b&gt;Worst Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member">2011-09-30</rr:BarChartLowestQuarterlyReturnDate>
  <rr:RiskReturnHeading contextRef="Duration_02May2014_01May2015S000022082_Member">&lt;b&gt;FUND SUMMARY: &amp;nbsp;CONSERVATIVE ALLOCATION FUND &lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ExpensesRestatedToReflectCurrent contextRef="Duration_02May2014_01May2015S000022087_Member">The expense information in the table has been restated to reflect an increase in the Fund's Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</rr:ExpensesRestatedToReflectCurrent>
  <rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees contextRef="Duration_02May2014_01May2015S000022087_Member">The Total Annual Fund Operating Expenses in this fee table may not correlate to the expense ratios in the Fund's financial highlights and financial statements because the financial highlights and financial statements reflect only the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses, which are fees and expenses incurred indirectly by the Fund through its investments in certain underlying investment companies.</rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees>
  <rr:RiskLoseMoney contextRef="Duration_02May2014_01May2015S000022087_Member">You may lose money by investing in the Money Market Fund.</rr:RiskLoseMoney>
  <rr:RiskMoneyMarketFund contextRef="Duration_02May2014_01May2015S000022087_Member">Although the Money Market Fund seeks to preserve the value of your investment at $1.00 per share, there is no guarantee that the Money Market Fund will be able to do so.</rr:RiskMoneyMarketFund>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_02May2014_01May2015S000022087_Member">The bar chart and table below show the performance of the Fund both year-by-year and as an average over different periods of time. The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index and one additional index, the Barclays Capital U.S. Aggregate Bond Index.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformanceAdditionalMarketIndex contextRef="Duration_02May2014_01May2015S000022087_Member">The Barclays Capital U.S. Aggregate Bond Index, in conjunction with the broad-based index, are used to track the broad range of allocations the Fund makes to the underlying funds. The foregoing indices, when considered together, may provide investors with a useful comparison of the Fund&amp;#8217;s overall performance.</rr:PerformanceAdditionalMarketIndex>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_02May2014_01May2015S000022087_Member">Past performance does not necessarily indicate how the Fund will perform in the future.</rr:PerformancePastDoesNotIndicateFuture>
  <rr:BarChartDoesNotReflectSalesLoads contextRef="Duration_02May2014_01May2015S000022087_Member">This performance information does not include the impact of any charges deducted under your variable contract. If it did, returns would be lower.</rr:BarChartDoesNotReflectSalesLoads>
  <rr:BarChartTableTextBlock contextRef="Duration_02May2014_01May2015S000022082_Member">&lt;div style="display:none"&gt;~ http://www.pennmutual.com/role/ScheduleAnnualTotalReturnsPennSeriesConservativeAllocationFundBarChart column period compact * ~&lt;/div&gt;</rr:BarChartTableTextBlock>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member">&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member">2009-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member">&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member">2011-09-30</rr:BarChartLowestQuarterlyReturnDate>
  <rr:BarChartClosingTextBlock contextRef="Duration_02May2014_01May2015S000022087_Member">&lt;table style="BORDER-COLLAPSE: collapse" border="0" cellspacing="0" cellpadding="0" width="75%"&gt; &lt;tr&gt; &lt;td width="15%"&gt;&lt;/td&gt; &lt;td valign="bottom" width="33%"&gt;&lt;/td&gt; &lt;td&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Best&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;&lt;b&gt;Worst&amp;nbsp;Quarter&lt;/b&gt;&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;11.68%&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;-9.29%&lt;/td&gt;&lt;/tr&gt; &lt;tr&gt; &lt;td valign="top" align="center"&gt;6/30/2009&lt;/td&gt; &lt;td valign="bottom"&gt;&amp;nbsp;&amp;nbsp;&lt;/td&gt; &lt;td valign="bottom" align="center"&gt;9/30/2011&lt;/td&gt;&lt;/tr&gt;&lt;/table&gt;</rr:BarChartClosingTextBlock>
  <rr:RiskLoseMoney contextRef="Duration_02May2014_01May2015S000022081_Member">You may lose money by investing in the Money Market Fund.</rr:RiskLoseMoney>
  <rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees contextRef="Duration_02May2014_01May2015S000006728_Member">The Total Annual Fund Operating Expenses in this fee table may not correlate to the expense ratios in the Fund&amp;#8217;s financial highlights and financial statements because the financial highlights and financial statements reflect only the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses, which are fees and expenses incurred indirectly by the Fund through its investments in certain underlying investment companies.</rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees>
  <rr:PerformanceTableHeading contextRef="Duration_02May2014_01May2015S000006736_Member">&lt;b&gt;Average Annual Total Return (for Periods Ended December 31, 2014)&lt;/b&gt;</rr:PerformanceTableHeading>
  <rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees contextRef="Duration_02May2014_01May2015S000006736_Member">The Total Annual Fund Operating Expenses in this fee table may not correlate to the expense ratios in the Fund&amp;#8217;s financial highlights and financial statements because the financial highlights and financial statements reflect only the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses, which are fees and expenses incurred indirectly by the Fund through its investments in certain underlying investment companies.</rr:ExpensesNotCorrelatedToRatioDueToAcquiredFundFees>
  <rr:PerformanceAdditionalMarketIndex contextRef="Duration_02May2014_01May2015S000006735_Member">The bar chart and table demonstrate the variability of performance over time and provide an indication of the risks and volatility of an investment in the Fund by showing how the Fund&amp;#8217;s average annual total returns for various periods compare with those of a broad-based securities market index and one additional index, the MSCI ACWI (All Country World Index) ex-U.S. Index. The foregoing indices, when considered together, may provide investors with a useful comparison of the Fund&amp;#8217;s overall performance.</rr:PerformanceAdditionalMarketIndex>
  <rr:RiskLoseMoney contextRef="Duration_02May2014_01May2015S000022082_Member">You may lose money by investing in the Money Market Fund.</rr:RiskLoseMoney>
  <rr:DistributionAndService12b1FeesOverAssets contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:OtherExpensesOverAssets contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" unitRef="pure">0.0028</rr:OtherExpensesOverAssets>
  <rr:ManagementFeesOverAssets contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" id="Item_2" unitRef="pure">0.0033</rr:ManagementFeesOverAssets>
  <rr:ExpensesOverAssets contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" id="Item_3" unitRef="pure">0.0061</rr:ExpensesOverAssets>
  <rr:AverageAnnualReturnYear01 contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" unitRef="pure">0.0001</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear05 contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" unitRef="pure">0.0001</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear10 contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" unitRef="pure">0.0154</rr:AverageAnnualReturnYear10>
  <rr:AnnualReturn2005 contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" unitRef="pure">0.0281</rr:AnnualReturn2005>
  <rr:AnnualReturn2006 contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" unitRef="pure">0.0466</rr:AnnualReturn2006>
  <rr:AnnualReturn2007 contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" unitRef="pure">0.0497</rr:AnnualReturn2007>
  <rr:AnnualReturn2008 contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" unitRef="pure">0.0266</rr:AnnualReturn2008>
  <rr:AnnualReturn2009 contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" unitRef="pure">0.0043</rr:AnnualReturn2009>
  <rr:AnnualReturn2010 contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" unitRef="pure">0.0001</rr:AnnualReturn2010>
  <rr:AnnualReturn2011 contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" unitRef="pure">0.0001</rr:AnnualReturn2011>
  <rr:AnnualReturn2012 contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" unitRef="pure">0.0001</rr:AnnualReturn2012>
  <rr:AnnualReturn2013 contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" unitRef="pure">0.0001</rr:AnnualReturn2013>
  <rr:AnnualReturn2014 contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" unitRef="pure">0.0001</rr:AnnualReturn2014>
  <rr:BarChartHighestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" unitRef="pure">0.0125</rr:BarChartHighestQuarterlyReturn>
  <rr:BarChartLowestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" unitRef="pure">0</rr:BarChartLowestQuarterlyReturn>
  <rr:MoneyMarketSevenDayYield contextRef="Duration_02May2014_01May2015S000006722_MemberC000018285_Member" decimals="4" unitRef="pure">0.0001</rr:MoneyMarketSevenDayYield>
  <rr:DistributionAndService12b1FeesOverAssets contextRef="Duration_02May2014_01May2015S000006723_MemberC000018286_Member" decimals="4" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:OtherExpensesOverAssets contextRef="Duration_02May2014_01May2015S000006723_MemberC000018286_Member" decimals="4" unitRef="pure">0.0026</rr:OtherExpensesOverAssets>
  <rr:ManagementFeesOverAssets contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="4" unitRef="pure">0.0055</rr:ManagementFeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="4" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:OtherExpensesOverAssets contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="4" unitRef="pure">0.0026</rr:OtherExpensesOverAssets>
  <rr:ExpensesOverAssets contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="4" unitRef="pure">0.0081</rr:ExpensesOverAssets>
  <rr:AverageAnnualReturnYear01 contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="4" unitRef="pure">0.1367</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 contextRef="Duration_02May2014_01May2015S000006726_MemberRussellMidcapValueIndex_Member" decimals="4" unitRef="pure">0.1475</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear05 contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="4" unitRef="pure">0.1602</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 contextRef="Duration_02May2014_01May2015S000006726_MemberRussellMidcapValueIndex_Member" decimals="4" unitRef="pure">0.1743</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear10 contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="4" unitRef="pure">0.0778</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 contextRef="Duration_02May2014_01May2015S000006726_MemberRussellMidcapValueIndex_Member" decimals="4" unitRef="pure">0.0943</rr:AverageAnnualReturnYear10>
  <rr:ManagementFeesOverAssets contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="4" id="Item_4" unitRef="pure">0.0013</rr:ManagementFeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="4" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:OtherExpensesOverAssets contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="4" unitRef="pure">0.0026</rr:OtherExpensesOverAssets>
  <rr:ExpensesOverAssets contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="4" id="Item_5" unitRef="pure">0.0039</rr:ExpensesOverAssets>
  <rr:PortfolioTurnoverRate contextRef="Duration_02May2014_01May2015S000006726_Member" decimals="4" unitRef="pure">0.32</rr:PortfolioTurnoverRate>
  <rr:AnnualReturn2005 contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="4" unitRef="pure">0.1233</rr:AnnualReturn2005>
  <rr:AnnualReturn2006 contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="4" unitRef="pure">0.1141</rr:AnnualReturn2006>
  <rr:AnnualReturn2007 contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="4" unitRef="pure">0.0377</rr:AnnualReturn2007>
  <rr:AnnualReturn2008 contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="4" unitRef="pure">-0.4726</rr:AnnualReturn2008>
  <rr:AnnualReturn2009 contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="4" unitRef="pure">0.4699</rr:AnnualReturn2009>
  <rr:AnnualReturn2010 contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="4" unitRef="pure">0.2577</rr:AnnualReturn2010>
  <rr:AnnualReturn2011 contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="4" unitRef="pure">-0.0627</rr:AnnualReturn2011>
  <rr:AnnualReturn2012 contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="4" unitRef="pure">0.1517</rr:AnnualReturn2012>
  <rr:AnnualReturn2013 contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="4" unitRef="pure">0.362</rr:AnnualReturn2013>
  <rr:AnnualReturn2014 contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="4" unitRef="pure">0.1367</rr:AnnualReturn2014>
  <rr:BarChartHighestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="4" unitRef="pure">0.253</rr:BarChartHighestQuarterlyReturn>
  <rr:BarChartLowestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000006726_MemberC000018289_Member" decimals="4" unitRef="pure">-0.2874</rr:BarChartLowestQuarterlyReturn>
  <rr:ManagementFeesOverAssets contextRef="Duration_02May2014_01May2015S000006728_MemberC000018291_Member" decimals="4" unitRef="pure">0.0072</rr:ManagementFeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets contextRef="Duration_02May2014_01May2015S000006728_MemberC000018291_Member" decimals="4" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:OtherExpensesOverAssets contextRef="Duration_02May2014_01May2015S000006728_MemberC000018291_Member" decimals="4" unitRef="pure">0.0033</rr:OtherExpensesOverAssets>
  <rr:AcquiredFundFeesAndExpensesOverAssets contextRef="Duration_02May2014_01May2015S000006728_MemberC000018291_Member" decimals="4" unitRef="pure">0.0001</rr:AcquiredFundFeesAndExpensesOverAssets>
  <rr:ExpensesOverAssets contextRef="Duration_02May2014_01May2015S000006728_MemberC000018291_Member" decimals="4" id="Item_6" unitRef="pure">0.0106</rr:ExpensesOverAssets>
  <rr:AverageAnnualReturnYear01 contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="4" unitRef="pure">0.1325</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 contextRef="Duration_02May2014_01May2015S000006724_MemberSandpFiveHundredIndex_Member" decimals="4" unitRef="pure">0.1369</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear05 contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="4" unitRef="pure">0.1507</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 contextRef="Duration_02May2014_01May2015S000006724_MemberSandpFiveHundredIndex_Member" decimals="4" unitRef="pure">0.1545</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear10 contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="4" unitRef="pure">0.075</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 contextRef="Duration_02May2014_01May2015S000006724_MemberSandpFiveHundredIndex_Member" decimals="4" unitRef="pure">0.0767</rr:AverageAnnualReturnYear10>
  <rr:ManagementFeesOverAssets contextRef="Duration_02May2014_01May2015S000006723_MemberC000018286_Member" decimals="4" id="Item_7" unitRef="pure">0.0046</rr:ManagementFeesOverAssets>
  <rr:AnnualReturn2014 contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="4" unitRef="pure">0.1325</rr:AnnualReturn2014>
  <rr:AnnualReturn2013 contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="4" unitRef="pure">0.3187</rr:AnnualReturn2013>
  <rr:AnnualReturn2012 contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="4" unitRef="pure">0.1568</rr:AnnualReturn2012>
  <rr:AnnualReturn2011 contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="4" unitRef="pure">0.0176</rr:AnnualReturn2011>
  <rr:AnnualReturn2010 contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="4" unitRef="pure">0.1477</rr:AnnualReturn2010>
  <rr:AnnualReturn2009 contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="4" unitRef="pure">0.2611</rr:AnnualReturn2009>
  <rr:AnnualReturn2008 contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="4" unitRef="pure">-0.3608</rr:AnnualReturn2008>
  <rr:AnnualReturn2007 contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="4" unitRef="pure">0.0509</rr:AnnualReturn2007>
  <rr:AnnualReturn2006 contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="4" unitRef="pure">0.1537</rr:AnnualReturn2006>
  <rr:AnnualReturn2005 contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="4" unitRef="pure">0.0448</rr:AnnualReturn2005>
  <rr:ExpensesOverAssets contextRef="Duration_02May2014_01May2015S000006723_MemberC000018286_Member" decimals="4" id="Item_8" unitRef="pure">0.0072</rr:ExpensesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets contextRef="Duration_02May2014_01May2015S000006730_MemberC000018293_Member" decimals="4" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:OtherExpensesOverAssets contextRef="Duration_02May2014_01May2015S000006730_MemberC000018293_Member" decimals="4" unitRef="pure">0.0024</rr:OtherExpensesOverAssets>
  <rr:AcquiredFundFeesAndExpensesOverAssets contextRef="Duration_02May2014_01May2015S000006730_MemberC000018293_Member" decimals="4" unitRef="pure">0.0001</rr:AcquiredFundFeesAndExpensesOverAssets>
  <rr:AverageAnnualReturnYear01 contextRef="Duration_02May2014_01May2015S000006728_MemberC000018291_Member" decimals="4" unitRef="pure">0.1637</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 contextRef="Duration_02May2014_01May2015S000006728_MemberRussellMidcapValueIndex_Member" decimals="4" unitRef="pure">0.1475</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear05 contextRef="Duration_02May2014_01May2015S000006728_MemberC000018291_Member" decimals="4" unitRef="pure">0.1579</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 contextRef="Duration_02May2014_01May2015S000006728_MemberRussellMidcapValueIndex_Member" decimals="4" unitRef="pure">0.1743</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear10 contextRef="Duration_02May2014_01May2015S000006728_MemberC000018291_Member" decimals="4" unitRef="pure">0.0698</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 contextRef="Duration_02May2014_01May2015S000006728_MemberRussellMidcapValueIndex_Member" decimals="4" unitRef="pure">0.0943</rr:AverageAnnualReturnYear10>
  <rr:BarChartHighestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000006724_MemberC000018287_Member" decimals="4" unitRef="pure">0.1574</rr:BarChartHighestQuarterlyReturn>
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  <rr:AcquiredFundFeesAndExpensesOverAssets contextRef="Duration_02May2014_01May2015S000006736_MemberC000018299_Member" decimals="4" unitRef="pure">0.0006</rr:AcquiredFundFeesAndExpensesOverAssets>
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  <rr:BarChartHighestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000006725_MemberC000018288_Member" decimals="4" unitRef="pure">0.2284</rr:BarChartHighestQuarterlyReturn>
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  <rr:AcquiredFundFeesAndExpensesOverAssets contextRef="Duration_02May2014_01May2015S000022076_MemberC000063367_Member" decimals="4" unitRef="pure">0.0096</rr:AcquiredFundFeesAndExpensesOverAssets>
  <rr:AnnualReturn2005 contextRef="Duration_02May2014_01May2015S000006730_MemberC000018293_Member" decimals="4" unitRef="pure">0.025</rr:AnnualReturn2005>
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  <rr:PortfolioTurnoverRate contextRef="Duration_02May2014_01May2015S000006730_Member" decimals="4" unitRef="pure">1.35</rr:PortfolioTurnoverRate>
  <rr:BarChartHighestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000006730_MemberC000018293_Member" decimals="4" unitRef="pure">0.0659</rr:BarChartHighestQuarterlyReturn>
  <rr:BarChartLowestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000006730_MemberC000018293_Member" decimals="4" unitRef="pure">-0.0275</rr:BarChartLowestQuarterlyReturn>
  <rr:PortfolioTurnoverRate contextRef="Duration_02May2014_01May2015S000006737_Member" decimals="4" unitRef="pure">0.33</rr:PortfolioTurnoverRate>
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  <rr:AnnualReturn2005 contextRef="Duration_02May2014_01May2015S000006737_MemberC000018300_Member" decimals="4" unitRef="pure">0.0627</rr:AnnualReturn2005>
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  <rr:BarChartHighestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000006737_MemberC000018300_Member" decimals="4" unitRef="pure">0.3499</rr:BarChartHighestQuarterlyReturn>
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  <rr:AcquiredFundFeesAndExpensesOverAssets contextRef="Duration_02May2014_01May2015S000022078_MemberC000063369_Member" decimals="4" unitRef="pure">0.0005</rr:AcquiredFundFeesAndExpensesOverAssets>
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  <rr:AverageAnnualReturnSinceInception contextRef="Duration_02May2014_01May2015S000022080_MemberRussellTwentyFiveValueIndex_Member" decimals="4" unitRef="pure">0.102</rr:AverageAnnualReturnSinceInception>
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  <rr:OtherExpensesOverAssets contextRef="Duration_02May2014_01May2015S000022078_MemberC000063369_Member" decimals="4" unitRef="pure">0.0039</rr:OtherExpensesOverAssets>
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  <rr:PortfolioTurnoverRate contextRef="Duration_02May2014_01May2015S000006736_Member" decimals="4" unitRef="pure">0.45</rr:PortfolioTurnoverRate>
  <rr:OtherExpensesOverAssets contextRef="Duration_02May2014_01May2015S000022081_MemberC000063372_Member" decimals="4" unitRef="pure">0.0021</rr:OtherExpensesOverAssets>
  <rr:AcquiredFundFeesAndExpensesOverAssets contextRef="Duration_02May2014_01May2015S000022081_MemberC000063372_Member" decimals="4" unitRef="pure">0.0048</rr:AcquiredFundFeesAndExpensesOverAssets>
  <rr:AnnualReturn2005 contextRef="Duration_02May2014_01May2015S000006736_MemberC000018299_Member" decimals="4" unitRef="pure">0.0367</rr:AnnualReturn2005>
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  <rr:PortfolioTurnoverRate contextRef="Duration_02May2014_01May2015S000022083_Member" decimals="4" unitRef="pure">0.07</rr:PortfolioTurnoverRate>
  <rr:BarChartHighestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000022081_MemberC000063372_Member" decimals="4" unitRef="pure">0.1051</rr:BarChartHighestQuarterlyReturn>
  <rr:BarChartLowestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000022081_MemberC000063372_Member" decimals="4" unitRef="pure">-0.0623</rr:BarChartLowestQuarterlyReturn>
  <rr:BarChartHighestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000022083_MemberC000063374_Member" decimals="4" unitRef="pure">0.2512</rr:BarChartHighestQuarterlyReturn>
  <rr:BarChartLowestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000022083_MemberC000063374_Member" decimals="4" unitRef="pure">-0.2012</rr:BarChartLowestQuarterlyReturn>
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  <rr:AnnualReturn2006 contextRef="Duration_02May2014_01May2015S000006729_MemberC000018292_Member" decimals="4" unitRef="pure">0.3241</rr:AnnualReturn2006>
  <rr:AnnualReturn2007 contextRef="Duration_02May2014_01May2015S000006729_MemberC000018292_Member" decimals="4" unitRef="pure">-0.1787</rr:AnnualReturn2007>
  <rr:AnnualReturn2008 contextRef="Duration_02May2014_01May2015S000006729_MemberC000018292_Member" decimals="4" unitRef="pure">-0.3938</rr:AnnualReturn2008>
  <rr:AnnualReturn2009 contextRef="Duration_02May2014_01May2015S000006729_MemberC000018292_Member" decimals="4" unitRef="pure">0.2654</rr:AnnualReturn2009>
  <rr:AnnualReturn2010 contextRef="Duration_02May2014_01May2015S000006729_MemberC000018292_Member" decimals="4" unitRef="pure">0.2514</rr:AnnualReturn2010>
  <rr:AnnualReturn2011 contextRef="Duration_02May2014_01May2015S000006729_MemberC000018292_Member" decimals="4" unitRef="pure">0.0704</rr:AnnualReturn2011>
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  <rr:AnnualReturn2013 contextRef="Duration_02May2014_01May2015S000006729_MemberC000018292_Member" decimals="4" unitRef="pure">0.0313</rr:AnnualReturn2013>
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  <rr:AverageAnnualReturnSinceInception contextRef="Duration_02May2014_01May2015S000022084_MemberC000063375_Member" decimals="4" unitRef="pure">0.0134</rr:AverageAnnualReturnSinceInception>
  <rr:AcquiredFundFeesAndExpensesOverAssets contextRef="Duration_02May2014_01May2015S000022077_MemberC000063368_Member" decimals="4" unitRef="pure">0.0075</rr:AcquiredFundFeesAndExpensesOverAssets>
  <rr:AverageAnnualReturnYear01 contextRef="Duration_02May2014_01May2015S000006727_MemberC000018290_Member" decimals="4" unitRef="pure">0.1129</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 contextRef="Duration_02May2014_01May2015S000006727_MemberRussellTenHundredGrowthIndex_Member" decimals="4" unitRef="pure">0.1305</rr:AverageAnnualReturnYear01>
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  <rr:ManagementFeesOverAssets contextRef="Duration_02May2014_01May2015S000022077_MemberC000063368_Member" decimals="4" id="Item_29" unitRef="pure">0.0012</rr:ManagementFeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets contextRef="Duration_02May2014_01May2015S000022077_MemberC000063368_Member" decimals="4" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:OtherExpensesOverAssets contextRef="Duration_02May2014_01May2015S000022077_MemberC000063368_Member" decimals="4" unitRef="pure">0.0021</rr:OtherExpensesOverAssets>
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  <rr:PortfolioTurnoverRate contextRef="Duration_02May2014_01May2015S000006729_Member" decimals="4" unitRef="pure">0.54</rr:PortfolioTurnoverRate>
  <rr:AcquiredFundFeesAndExpensesOverAssets contextRef="Duration_02May2014_01May2015S000022088_MemberC000063379_Member" decimals="4" unitRef="pure">0.009</rr:AcquiredFundFeesAndExpensesOverAssets>
  <rr:BarChartHighestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000006727_MemberC000018290_Member" decimals="4" unitRef="pure">0.1705</rr:BarChartHighestQuarterlyReturn>
  <rr:BarChartLowestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000006727_MemberC000018290_Member" decimals="4" unitRef="pure">-0.2616</rr:BarChartLowestQuarterlyReturn>
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  <rr:BarChartHighestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000006729_MemberC000018292_Member" decimals="4" unitRef="pure">0.3058</rr:BarChartHighestQuarterlyReturn>
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  <rr:ManagementFeesOverAssets contextRef="Duration_02May2014_01May2015S000006727_MemberC000018290_Member" decimals="4" unitRef="pure">0.0055</rr:ManagementFeesOverAssets>
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  <rr:BarChartHighestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000022084_MemberC000063375_Member" decimals="4" unitRef="pure">0.3474</rr:BarChartHighestQuarterlyReturn>
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  <rr:PortfolioTurnoverRate contextRef="Duration_02May2014_01May2015S000022077_Member" decimals="4" unitRef="pure">0.2</rr:PortfolioTurnoverRate>
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  <rr:OtherExpensesOverAssets contextRef="Duration_02May2014_01May2015S000022088_MemberC000063379_Member" decimals="4" unitRef="pure">0.0021</rr:OtherExpensesOverAssets>
  <rr:ExpensesOverAssets contextRef="Duration_02May2014_01May2015S000022088_MemberC000063379_Member" decimals="4" id="Item_34" unitRef="pure">0.0123</rr:ExpensesOverAssets>
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  <rr:BarChartHighestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000022077_MemberC000063368_Member" decimals="4" unitRef="pure">0.0862</rr:BarChartHighestQuarterlyReturn>
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  <rr:PortfolioTurnoverRate contextRef="Duration_02May2014_01May2015S000022088_Member" decimals="4" unitRef="pure">0.17</rr:PortfolioTurnoverRate>
  <rr:BarChartHighestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000022088_MemberC000063379_Member" decimals="4" unitRef="pure">0.1452</rr:BarChartHighestQuarterlyReturn>
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  <rr:ManagementFeesOverAssets contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member" decimals="4" id="Item_35" unitRef="pure">0.0012</rr:ManagementFeesOverAssets>
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  <rr:OtherExpensesOverAssets contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member" decimals="4" unitRef="pure">0.0022</rr:OtherExpensesOverAssets>
  <rr:AcquiredFundFeesAndExpensesOverAssets contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member" decimals="4" unitRef="pure">0.0066</rr:AcquiredFundFeesAndExpensesOverAssets>
  <rr:ExpensesOverAssets contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member" decimals="4" id="Item_36" unitRef="pure">0.01</rr:ExpensesOverAssets>
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  <rr:DistributionAndService12b1FeesOverAssets contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member" decimals="4" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:OtherExpensesOverAssets contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member" decimals="4" unitRef="pure">0.002</rr:OtherExpensesOverAssets>
  <rr:AcquiredFundFeesAndExpensesOverAssets contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member" decimals="4" unitRef="pure">0.0083</rr:AcquiredFundFeesAndExpensesOverAssets>
  <rr:ExpensesOverAssets contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member" decimals="4" id="Item_38" unitRef="pure">0.0115</rr:ExpensesOverAssets>
  <rr:AverageAnnualReturnYear01 contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member" decimals="4" unitRef="pure">0.0563</rr:AverageAnnualReturnYear01>
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  <rr:AverageAnnualReturnYear05 contextRef="Duration_02May2014_01May2015S000022087_MemberBarclaysCapitalUsAggregateBondIndex_Member" decimals="4" unitRef="pure">0.0445</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnSinceInception contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member" decimals="4" unitRef="pure">0.0635</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception contextRef="Duration_02May2014_01May2015S000022087_MemberRussellThirtyHundredIndex_Member" decimals="4" unitRef="pure">0.1014</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception contextRef="Duration_02May2014_01May2015S000022087_MemberBarclaysCapitalUsAggregateBondIndex_Member" decimals="4" unitRef="pure">0.0503</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnYear01 contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member" decimals="4" unitRef="pure">0.0375</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 contextRef="Duration_02May2014_01May2015S000022082_MemberBarclaysCapitalUsAggregateBondIndex_Member" decimals="4" unitRef="pure">0.0597</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 contextRef="Duration_02May2014_01May2015S000022082_MemberRussellThirtyHundredIndex_Member" decimals="4" unitRef="pure">0.1256</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear05 contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member" decimals="4" unitRef="pure">0.0489</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 contextRef="Duration_02May2014_01May2015S000022082_MemberBarclaysCapitalUsAggregateBondIndex_Member" decimals="4" unitRef="pure">0.0445</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 contextRef="Duration_02May2014_01May2015S000022082_MemberRussellThirtyHundredIndex_Member" decimals="4" unitRef="pure">0.1563</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnSinceInception contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member" decimals="4" unitRef="pure">0.0438</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception contextRef="Duration_02May2014_01May2015S000022082_MemberBarclaysCapitalUsAggregateBondIndex_Member" decimals="4" unitRef="pure">0.0503</rr:AverageAnnualReturnSinceInception>
  <rr:AverageAnnualReturnSinceInception contextRef="Duration_02May2014_01May2015S000022082_MemberRussellThirtyHundredIndex_Member" decimals="4" unitRef="pure">0.1014</rr:AverageAnnualReturnSinceInception>
  <rr:PortfolioTurnoverRate contextRef="Duration_02May2014_01May2015S000022082_Member" decimals="4" unitRef="pure">0.26</rr:PortfolioTurnoverRate>
  <rr:BarChartHighestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member" decimals="4" unitRef="pure">0.0526</rr:BarChartHighestQuarterlyReturn>
  <rr:BarChartLowestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member" decimals="4" unitRef="pure">-0.0137</rr:BarChartLowestQuarterlyReturn>
  <rr:AnnualReturn2009 contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member" decimals="4" unitRef="pure">0.2058</rr:AnnualReturn2009>
  <rr:AnnualReturn2010 contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member" decimals="4" unitRef="pure">0.1224</rr:AnnualReturn2010>
  <rr:AnnualReturn2011 contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member" decimals="4" unitRef="pure">0.0065</rr:AnnualReturn2011>
  <rr:AnnualReturn2012 contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member" decimals="4" unitRef="pure">0.1093</rr:AnnualReturn2012>
  <rr:AnnualReturn2013 contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member" decimals="4" unitRef="pure">0.1411</rr:AnnualReturn2013>
  <rr:AnnualReturn2014 contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member" decimals="4" unitRef="pure">0.0563</rr:AnnualReturn2014>
  <rr:PortfolioTurnoverRate contextRef="Duration_02May2014_01May2015S000022087_Member" decimals="4" unitRef="pure">0.17</rr:PortfolioTurnoverRate>
  <rr:BarChartHighestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member" decimals="4" unitRef="pure">0.1168</rr:BarChartHighestQuarterlyReturn>
  <rr:BarChartLowestQuarterlyReturn contextRef="Duration_02May2014_01May2015S000022087_MemberC000063378_Member" decimals="4" unitRef="pure">-0.0929</rr:BarChartLowestQuarterlyReturn>
  <rr:AnnualReturn2009 contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member" decimals="4" unitRef="pure">0.108</rr:AnnualReturn2009>
  <rr:AnnualReturn2010 contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member" decimals="4" unitRef="pure">0.0689</rr:AnnualReturn2010>
  <rr:AnnualReturn2011 contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member" decimals="4" unitRef="pure">0.0392</rr:AnnualReturn2011>
  <rr:AnnualReturn2012 contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member" decimals="4" unitRef="pure">0.0548</rr:AnnualReturn2012>
  <rr:AnnualReturn2013 contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member" decimals="4" unitRef="pure">0.0443</rr:AnnualReturn2013>
  <rr:AnnualReturn2014 contextRef="Duration_02May2014_01May2015S000022082_MemberC000063373_Member" decimals="4" unitRef="pure">0.0375</rr:AnnualReturn2014>
  <rr:AverageAnnualReturnYear01 contextRef="Duration_02May2014_01May2015S000022084_MemberMsciEmergingMarketsIndex_Member" decimals="4" unitRef="pure">-0.0182</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear05 contextRef="Duration_02May2014_01May2015S000022084_MemberMsciEmergingMarketsIndex_Member" decimals="4" unitRef="pure">0.0211</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnSinceInception contextRef="Duration_02May2014_01May2015S000022084_MemberMsciEmergingMarketsIndex_Member" decimals="4" unitRef="pure">0.0276</rr:AverageAnnualReturnSinceInception>
  <rr:PortfolioTurnoverRate contextRef="Duration_02May2014_01May2015S000006727_Member" decimals="4" unitRef="pure">0.25</rr:PortfolioTurnoverRate>
  <rr:PortfolioTurnoverRate contextRef="Duration_02May2014_01May2015S000006724_Member" decimals="4" unitRef="pure">0.03</rr:PortfolioTurnoverRate>
  <link:footnoteLink xlink:role="http://www.xbrl.org/2003/role/link" xlink:type="extended">
    <link:loc xlink:href="#Item_4" xlink:label="ManagementFeesOverAssets" xlink:type="locator"/>
    <link:footnote id="footnote_ManagementFeesOverAssets" xlink:label="footnote_ManagementFeesOverAssets" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US">The expense information in the table has been restated to reflect an increase in the Fund's Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</link:footnote>
    <link:footnoteArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="ManagementFeesOverAssets" xlink:to="footnote_ManagementFeesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_5" xlink:label="Item_5_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_5_lbl" xlink:to="footnote_ManagementFeesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_7" xlink:label="Item_7_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_7_lbl" xlink:to="footnote_ManagementFeesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_8" xlink:label="Item_8_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_8_lbl" xlink:to="footnote_ManagementFeesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_11" xlink:label="Item_11_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_11_lbl" xlink:to="footnote_ManagementFeesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_12" xlink:label="Item_12_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_12_lbl" xlink:to="footnote_ManagementFeesOverAssets" xlink:type="arc"/>
    <link:footnote id="footnote_ExpensesOverAssets" xlink:label="footnote_ExpensesOverAssets" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US">The Total Annual Fund Operating Expenses in this fee table may not correlate to the expense ratios in the Fund&#x2019;s financial highlights and financial statements because the financial highlights and financial statements reflect only the operating expenses of the Fund and do not include Acquired Fund Fees and Expenses, which are fees and expenses incurred indirectly by the Fund through its investments in certain underlying investment companies.</link:footnote>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_12_lbl" xlink:to="footnote_ExpensesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_17" xlink:label="Item_17_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_17_lbl" xlink:to="footnote_ManagementFeesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_18" xlink:label="Item_18_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_18_lbl" xlink:to="footnote_ManagementFeesOverAssets" xlink:type="arc"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_18_lbl" xlink:to="footnote_ExpensesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_19" xlink:label="Item_19_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_19_lbl" xlink:to="footnote_ManagementFeesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_20" xlink:label="Item_20_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_20_lbl" xlink:to="footnote_ManagementFeesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_21" xlink:label="Item_21_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_21_lbl" xlink:to="footnote_ManagementFeesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_22" xlink:label="Item_22_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_22_lbl" xlink:to="footnote_ManagementFeesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_27" xlink:label="Item_27_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_27_lbl" xlink:to="footnote_ManagementFeesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_28" xlink:label="Item_28_lbl" xlink:type="locator"/>
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    <link:loc xlink:href="#Item_29" xlink:label="Item_29_lbl" xlink:type="locator"/>
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    <link:loc xlink:href="#Item_30" xlink:label="Item_30_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_30_lbl" xlink:to="footnote_ManagementFeesOverAssets" xlink:type="arc"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_30_lbl" xlink:to="footnote_ExpensesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_33" xlink:label="Item_33_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_33_lbl" xlink:to="footnote_ManagementFeesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_34" xlink:label="Item_34_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_34_lbl" xlink:to="footnote_ManagementFeesOverAssets" xlink:type="arc"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_34_lbl" xlink:to="footnote_ExpensesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_37" xlink:label="Item_37_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_37_lbl" xlink:to="footnote_ManagementFeesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_38" xlink:label="Item_38_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_38_lbl" xlink:to="footnote_ManagementFeesOverAssets" xlink:type="arc"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_38_lbl" xlink:to="footnote_ExpensesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_6" xlink:label="ExpensesOverAssets" xlink:type="locator"/>
    <link:footnoteArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="ExpensesOverAssets" xlink:to="footnote_ExpensesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_16" xlink:label="Item_16_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_16_lbl" xlink:to="footnote_ExpensesOverAssets" xlink:type="arc"/>
    <link:footnote id="footnote_ManagementFeesOverAssets_5" xlink:label="footnote_ManagementFeesOverAssets_5" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US">           The expense information in the table has been restated to reflect a reduction in the Fund's Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</link:footnote>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_16_lbl" xlink:to="footnote_ManagementFeesOverAssets_5" xlink:type="arc"/>
    <link:loc xlink:href="#Item_25" xlink:label="Item_25_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_25_lbl" xlink:to="footnote_ExpensesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_26" xlink:label="Item_26_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_26_lbl" xlink:to="footnote_ExpensesOverAssets" xlink:type="arc"/>
    <link:loc xlink:href="#Item_36" xlink:label="Item_36_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_36_lbl" xlink:to="footnote_ExpensesOverAssets" xlink:type="arc"/>
    <link:footnote id="footnote_ManagementFeesOverAssets_4" xlink:label="footnote_ManagementFeesOverAssets_4" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US">The expense information in the table has been restated to reflect an increase in the Fund's Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</link:footnote>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_36_lbl" xlink:to="footnote_ManagementFeesOverAssets_4" xlink:type="arc"/>
    <link:loc xlink:href="#Item_9" xlink:label="ManagementFeesOverAssets_2" xlink:type="locator"/>
    <link:footnote id="footnote_ManagementFeesOverAssets_2" xlink:label="footnote_ManagementFeesOverAssets_2" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US">The expense information in the table has been restated to reflect an increase in the Fund's Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</link:footnote>
    <link:footnoteArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="ManagementFeesOverAssets_2" xlink:to="footnote_ManagementFeesOverAssets_2" xlink:type="arc"/>
    <link:loc xlink:href="#Item_10" xlink:label="Item_10_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_10_lbl" xlink:to="footnote_ManagementFeesOverAssets_2" xlink:type="arc"/>
    <link:loc xlink:href="#Item_13" xlink:label="Item_13_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_13_lbl" xlink:to="footnote_ManagementFeesOverAssets_2" xlink:type="arc"/>
    <link:loc xlink:href="#Item_14" xlink:label="Item_14_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_14_lbl" xlink:to="footnote_ManagementFeesOverAssets_2" xlink:type="arc"/>
    <link:loc xlink:href="#Item_2" xlink:label="ManagementFeesOverAssets_3" xlink:type="locator"/>
    <link:footnote id="footnote_ManagementFeesOverAssets_3" xlink:label="footnote_ManagementFeesOverAssets_3" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US">The expense information in the table has been restated to reflect an increase in the Fund's Investment Advisory Fee approved by Fund shareholders on February 13, 2014 and effective May 1, 2014.</link:footnote>
    <link:footnoteArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="ManagementFeesOverAssets_3" xlink:to="footnote_ManagementFeesOverAssets_3" xlink:type="arc"/>
    <link:loc xlink:href="#Item_3" xlink:label="Item_3_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_3_lbl" xlink:to="footnote_ManagementFeesOverAssets_3" xlink:type="arc"/>
    <link:loc xlink:href="#Item_23" xlink:label="ManagementFeesOverAssets_4" xlink:type="locator"/>
    <link:footnoteArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="ManagementFeesOverAssets_4" xlink:to="footnote_ManagementFeesOverAssets_4" xlink:type="arc"/>
    <link:loc xlink:href="#Item_24" xlink:label="Item_24_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_24_lbl" xlink:to="footnote_ManagementFeesOverAssets_4" xlink:type="arc"/>
    <link:loc xlink:href="#Item_35" xlink:label="Item_35_lbl" xlink:type="locator"/>
    <link:footnoteArc order="1.0" priority="0" use="optional" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_35_lbl" xlink:to="footnote_ManagementFeesOverAssets_4" xlink:type="arc"/>
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    <link:footnoteArc xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="ManagementFeesOverAssets_5" xlink:to="footnote_ManagementFeesOverAssets_5" xlink:type="arc"/>
    <link:loc xlink:href="#Item_31" xlink:label="FeeWaiverOrReimbursementOverAssets" xlink:type="locator"/>
    <link:footnote id="footnote_FeeWaiverOrReimbursementOverAssets" xlink:label="footnote_FeeWaiverOrReimbursementOverAssets" xlink:role="http://www.xbrl.org/2003/role/footnote" xlink:type="resource" xml:lang="en-US">Penn Mutual and the Adviser have contractually agreed to waive a portion of their fees and/or reimburse expenses to the extent necessary to keep the Fund's Total Annual Operating Expenses from exceeding 0.89% of average daily net assets (excluding nonrecurring account fees, fees on portfolio transactions, such as exchange fees, dividends and interest on securities sold short, acquired fund fees and expenses, interest, taxes, brokerage commissions, other expenditures which are capitalized in accordance with generally accepted accounting principles, and other non-routine expenses or extraordinary expenses not incurred in the ordinary course of the Fund's business) through April 30, 2016. The agreement may be terminated prior to April 30, 2016 only by a majority vote of the Company's Board of Directors for any reason and at any time.</link:footnote>
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