Prospectus: Prospectus: Series [Axis] Series [Axis] S000008897 Member Ultra Short Mortgage Fund Ultra Short Mortgage Fund. Document [Axis] Document [Axis] Prospectus One Member Asset Management Fund - Mutual Funds Prospectus One. Risk/Return: Risk/Return: Risk/Return [Heading] Risk/Return [Heading] Objective [Heading] Objective [Heading] Objective, Primary [Text Block] Objective, Primary [Text Block] Expense [Heading] Expense [Heading] Expense Narrative [Text Block] Expense Narrative [Text Block] Operating Expenses Caption [Text] Operating Expenses Caption [Text] Annual Fund Operating Expenses [Table] Annual Fund Operating Expenses [Table] Expense Example [Heading] Expense Example [Heading] Expense Example Narrative [Text Block] Expense Example Narrative [Text Block] Expense Example, With Redemption [Table] Expense Example, With Redemption [Table] Portfolio Turnover [Heading] Portfolio Turnover [Heading] Portfolio Turnover [Text Block] Portfolio Turnover [Text Block] Strategy [Heading] Strategy [Heading] Strategy Narrative [Text Block] Strategy Narrative [Text Block] Risk [Heading] Risk [Heading] Risk Narrative [Text Block] Risk Narrative [Text Block] Bar Chart and Performance Table [Heading] Bar Chart and Performance Table [Heading] Performance Narrative [Text Block] Performance Narrative [Text Block] Bar Chart [Heading] Bar Chart [Heading] Bar Chart [Table] Bar Chart [Table] Bar Chart Closing [Text Block] Bar Chart Closing [Text Block] Performance Table Heading Performance Table Heading Performance Table Narrative Performance Table Narrative Performance [Table] Performance [Table] Performance Table Closing [Text Block] Performance Table Closing [Text Block] S000008900 Member U.S. Government Mortgage Fund U.S. Government Mortgage Fund. Share Class [Axis] Share Class [Axis] C000024219 Member Ultra Short Mortgage Fund Ultra Short Mortgage Fund. Performance Measure [Axis] Performance Measure [Axis] Return Before Taxes Member (before taxes) Return Before Taxes. After Taxes on Distributions (after taxes on distributions) After Taxes on Distributions and Sales (after taxes on distributions and redemptions) Barclays Capital Six Month T Bill Bellwethers Member Barclays Capital 6 Month T-Bill Bellwethers Barclays Capital 6 Month T-Bill Bellwethers. Average Annual Return: Average Annual Total Returns Label Label 1 Year 1 Year 5 Years 5 Years 10 Years 10 Years Barclays Capital U S Mbs Fixed Rate Index Member Barclays Capital U.S. MBS Fixed Rate Index Barclays Capital U.S. MBS Fixed Rate Index. C000024222 Member U.S. Government Mortgage Fund U.S. Government Mortgage Fund. Series Prospectus Share Classes Performance Measure Supplement [Text Block] Supplement Text Block. Document Type Document Period End Date Registrant Name Central Index Key Amendment Flag Amendment Description Trading Symbol Document Creation Date Document Effective Date Prospectus Date Caption Column Since Inception Inception Date