Acquired Fund Fees And Expenses Over Assets Acquired Fund Fees and Expenses (AFFE) After Taxes On Distributions And Sales [Member] After Taxes on Distributions and Sales After Taxes On Distributions [Member] After Taxes on Distributions Amendment Flag Amendment Flag Annual Fund Operating Expenses Table [Text Block] Annual Fund Operating Expenses [Table] Annual Return 2002 Annual Return 2002 Annual Return 2003 Annual Return 2003 Annual Return 2004 Annual Return 2004 Annual Return 2005 Annual Return 2005 Annual Return 2006 Annual Return 2006 Annual Return 2007 Annual Return 2007 Annual Return 2008 Annual Return 2008 Annual Return 2009 Annual Return 2009 Annual Return 2010 Annual Return 2010 Annual Return 2011 Annual Return 2011 Average Annual Return [Abstract] Average Annual Return: Average Annual Return Inception Date Inception Date Return Before Taxes, Secondary Average Annual Return Inception Date Secondary Average Annual Returns, Inception Date Secondary Average Annual Return Label Label Average Annual Return Since Inception Since Inception Return Before Taxes, Secondary Average Annual Return Since Inception Secondary Average Annual Returns, Since Inception Secondary Average Annual Return Year 01 1 Year Average Annual Return Year 05 5 Years Average Annual Return Year 10 10 Years Bar Chart And Performance Table Heading Bar Chart and Performance Table [Heading] Bar Chart Closing [Text Block] Bar Chart Closing [Text Block] Bar Chart Highest Quarterly Return Highest Quarterly Return Bar Chart Highest Quarterly Return Date Highest Quarterly Return, Date Bar Chart Lowest Quarterly Return Lowest Quarterly Return Bar Chart Lowest Quarterly Return Date Lowest Quarterly Return, Date Bar Chart Table [Abstract] Bar Chart Table: Bar Chart Table [Text Block] Bar Chart [Table] Bar Chart Year To Date Return Bar Chart, Year to Date Return Bar Chart Year To Date Return Date Bar Chart, Year to Date Return, Date CLASS A C 000017624 [Member] CLASS A CLASS B C 000017625 [Member] CLASS B CLASS A C 000017626 [Member] CLASS A CLASS A C 000017627 [Member] CLASS A CLASS A C 000017629 [Member] CLASS A CLASS A C 000017630 [Member] CLASS A CLASS A C 000017631 [Member] CLASS A CLASS A C 000017632 [Member] CLASS A CLASS A C 000017633 [Member] CLASS A CLASS B C 000017634 [Member] CLASS B CLASS C C 000017635 [Member] CLASS C CLASS A C 000017636 [Member] CLASS A CLASS A C 000047166 [Member] CLASS A Distribution And Service 12 b 1 Fees Over Assets Distribution (12b-1) Fees Document Creation Date Document Creation Date Document [Domain] Prospectus Document Effective Date Document Effective Date Document Information Document [Axis] Document [Axis] Document Period End Date Document Period End Date Document Type Document Type Entity Central Index Key Central Index Key Entity [Domain] Series Entity Registrant Name Registrant Name Expense Example [Abstract] Expense Example: Expense Example By Year Caption Expense Example by, Year, Caption [Text] Expense Example Heading Expense Example [Heading] Expense Example Narrative [Text Block] Expense Example Narrative [Text Block] Expense Example With Redemption Table [Text Block] Expense Example, With Redemption [Table] Expense Example Year 01 Expense Example, with Redemption, 1 Year Expense Example Year 03 Expense Example, with Redemption, 3 Years Expense Example Year 05 Expense Example, with Redemption, 5 Years Expense Example Year 10 Expense Example, with Redemption, 10 Years Expense Heading Expense [Heading] Expense Narrative [Text Block] Expense Narrative [Text Block] Expenses Over Assets Total Annual Fund Operating Expenses Highest Quarterly Return Label Highest Quarterly Return, Label Index No Deduction For Fees Expenses Taxes Index No Deduction for Fees, Expenses, Taxes [Text] Legal Entity [Axis] Series [Axis] Lowest Quarterly Return Label Lowest Quarterly Return, Label Management Fees Over Assets Management Fees Objective Heading Objective [Heading] Objective Primary [Text Block] Objective, Primary [Text Block] Operating Expenses [Abstract] Operating Expenses: Operating Expenses Caption Operating Expenses Caption [Text] Other Expenses Over Assets Other Expenses Performance Availability Phone Performance Availability Phone [Text] Performance Information Illustrates Variability Of Returns Performance Information Illustrates Variability of Returns [Text] Performance Measure [Axis] Performance Measure [Axis] Performance Measure [Domain] Before Taxes Performance Narrative [Text Block] Performance Narrative [Text Block] Performance Past Does Not Indicate Future Performance Past Does Not Indicate Future [Text] Performance Table Closing [Text Block] Performance Table Closing [Text Block] Performance Table Heading Performance Table Heading Performance Table Narrative [Text Block] Performance Table Narrative Performance Table Not Relevant To Tax Deferred Performance Table Not Relevant to Tax Deferred Performance Table [Text Block] Performance [Table] Performance Table Uses Highest Federal Rate Performance Table Uses Highest Federal Rate Portfolio Turnover Heading Portfolio Turnover [Heading] Portfolio Turnover Rate Portfolio Turnover, Rate Portfolio Turnover [Text Block] Portfolio Turnover [Text Block] Prospectus Date ProspectusDate Prospectus Share Class [Axis] Share Class [Axis] Prospectus [Table] Prospectus: Redemption Fee Over Redemption Redemption Fee (applies to a redemption, or series of redemptions, from a single identifiable source that, in the aggregate, exceeds $25 million within any thirty (30) day period) Redemption Fee (applies to a redemption, or series of redemptions, from a single identifiable source that, in the aggregate, exceeds $10 million within any thirty (30) day period) Redemption Fee (applies to a redemption, or series of redemptions, from a single identifiable source that, in the aggregate, exceeds $10 million within any thirty (30) day period) Redemption Fee (applies to a redemption, or series of redemptions, from a single identifiable source that, in the aggregate, exceeds $10 million within any thirty (30) day period) Redemption Fee (applies to a redemption, or series of redemptions, from a single identifiable source that, in the aggregate, exceeds $25 million within any thirty (30) day period) Redemption Fee (applies to a redemption, or series of redemptions, from a single identifiable source that, in the aggregate, exceeds $10 million within any thirty (30) day period) Risk Heading Risk [Heading] Risk Lose Money Risk Lose Money [Text] Risk Narrative [Text Block] Risk Narrative [Text Block] Risk Nondiversified Status Risk Nondiversified Status [Text] Risk Not Insured Depository Institution Risk Not Insured Depository Institution [Text] Risk Return [Abstract] Risk/Return: Risk Return Heading Risk/Return [Heading] Barclays Capital 1-Year Municipal Bond Index R R I N D E X 00001 [Member] Barclays Capital 1-Year Municipal Bond Index Barclays Capital MF Pennsylvania Intermediate Municipal Index R R I N D E X 00002 [Member] Barclays Capital MF Pennsylvania Intermediate Municipal Index Barclays Capital MF Massachusetts Intermediate Municipal Index R R I N D E X 00003 [Member] Barclays Capital MF Massachusetts Intermediate Municipal Index Barclays Capital MF New York Intermediate Municipal Index R R I N D E X 00004 [Member] Barclays Capital MF New York Intermediate Municipal Index Barclays Capital 3-10 Year Intermediate Municipal Blend Index R R I N D E X 00005 [Member] Barclays Capital 3-10 Year Intermediate Municipal Blend Index Barclays Capital MF California Intermediate Municipal Index R R I N D E X 00006 [Member] Barclays Capital MF California Intermediate Municipal Index Barclays Capital 3-15 Year Intermediate Municipal Blend Index R R I N D E X 00007 [Member] Barclays Capital 3-15 Year Intermediate Municipal Blend Index Barclays Capital High Yield Municipal Bond Index R R I N D E X 00008 [Member] Barclays Capital High Yield Municipal Bond Index The Fund's 60/40 Blended Benchmark Return R R I N D E X 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Summary) STET NEW JERSEY MUNICIPAL BOND FUND (Prospectus Summary) Summary S 000006435 [Member] STET NEW JERSEY MUNICIPAL BOND FUND (Prospectus Summary) STET CALIFORNIA MUNICIPAL BOND FUND (Prospectus Summary) Summary S 000006436 [Member] STET CALIFORNIA MUNICIPAL BOND FUND (Prospectus Summary) STET TAX FREE FUND (Prospectus Summary) Summary S 000006437 [Member] STET TAX FREE FUND (Prospectus Summary) STET INSTITUTIONAL TAX FREE FUND (First Prospectus Summary) Summary S 000006438 - 1 [Member] STET INSTITUTIONAL TAX FREE FUND (First Prospectus Summary) STET INSTITUTIONAL TAX FREE FUND (Second Prospectus Summary) Summary S 000006438 - 2 [Member] STET INSTITUTIONAL TAX FREE FUND (Second Prospectus Summary) STET INSTITUTIONAL TAX FREE FUND (Third Prospectus Summary) Summary S 000006438 - 3 [Member] STET INSTITUTIONAL TAX FREE FUND (Third Prospectus Summary) STET INTERMEDIATE TERM MUNICIPAL FUND (Prospectus Summary) Summary S 000006439 [Member] STET INTERMEDIATE TERM MUNICIPAL FUND (Prospectus Summary) STET TAX-ADVANTAGED INCOME FUND (Prospectus Summary) Summary S 000016947 [Member] STET TAX-ADVANTAGED INCOME FUND (Prospectus Summary) Trading Symbol Trading Symbol Year To Date Return Label Year to Date Return, Label