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PIA MBS Bond Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading PIA MBS Bond Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The MBS Bond Fund’s investment objective is to seek to provide a total rate of return that exceeds the Bloomberg Barclays U.S. MBS Fixed Rate Index (the “MBS Index”).
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy and hold shares of the MBS Bond Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption SHAREHOLDER FEES (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption ANNUAL FUND OPERATING EXPENSES (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination Mar. 29, 2020
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The MBS Bond Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio).  A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account.  These costs, which are not reflected in annual fund operating expenses or in the Example, affect the Fund’s performance.  During the most recent fiscal year, the Fund’s portfolio turnover rate was 239% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 239.00%
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This Example is intended to help you compare the cost of investing in the MBS Bond 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’s operating expenses remain the same (taking into account the temporary expense limitation only in the first year).
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs may be higher or lower, based on these assumptions, your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies of the Fund
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
Under normal market conditions, the MBS Bond Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in mortgage-backed securities, including commercial mortgage-backed securities.  In pursuing its objective, the Adviser attempts to provide a return that exceeds the total rate of return of the MBS Index, although there is no guarantee that the Adviser will be able to do so.  The MBS Index represents the universe of mortgage-backed securities issued by the Government National Mortgage Association (“GNMA”), Federal National Mortgage Association (“FNMA”) and Federal Home Loan Mortgage Corporation (“FHLMC”).  The Adviser will primarily consider credit quality, effective duration and yield in selecting investments for the Fund’s portfolio.  The duration of the Fund will generally be in a range of plus or minus 1.5 years of the effective duration of the MBS Index.

The MBS Bond Fund may invest up to 20% of its net assets in futures, options and other derivatives.  The Fund may sometimes use derivatives as a substitute for taking positions in bonds and/or as part of a strategy designed to reduce exposure to other risks.  The Fund may also utilize the “To Be Announced” (“TBA”) market for mortgage-backed securities for up to 100% of its net assets.  The TBA market allows investors to gain exposure to mortgage-backed securities with certain broad characteristics (maturity, coupon, etc.) without taking delivery of the actual securities until the settlement day which is once every month.  In addition, the Fund may utilize the dollar roll market, in which one sells, in the TBA market, the security for current month settlement, while simultaneously committing to buy a substantially similar TBA security for next month settlement.  The Fund may utilize the dollar roll market for extended periods of time without taking delivery of the physical securities.  The Fund may also invest up to 20% of its net assets in asset-backed securities.

The MBS Bond Fund’s annual portfolio turnover rate may exceed 100%.
Risk [Heading] rr_RiskHeading Principal Risks of Investing in the Fund
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
Losing all or a portion of your investment is a risk of investing in the MBS Bond Fund.  The success of the Fund cannot be guaranteed.  There are risks associated with investments in the types of securities in which the Fund invests.  These risks include:

·
Market and Regulatory Risk.  Events in the financial markets and economy may cause volatility and uncertainty and adversely impact the Fund’s performance. Market events may affect a single issuer, industry, sector, or the market as a whole. Traditionally liquid investments may experience periods of diminished liquidity. Governmental and regulatory actions, including tax law changes, may also impair portfolio management and have unexpected or adverse consequences on particular markets, strategies, or investments.

·
Management Risk.  The MBS Bond Fund is an actively managed portfolio.  The Adviser’s management practices and investment strategies might not work to produce the desired results.

·
Interest Rate Risk.  The value of the Fund’s investments in fixed-income securities will change based on changes in interest rates.  If interest rates increase, the value of these investments generally declines.  Securities with greater interest rate sensitivity and longer maturities generally are subject to greater fluctuations in value.  Given that the Federal Reserve has begun to raise interest rates, the Fund may face a heightened level if interest rate risk.

·
Credit Risk.  The issuers of the bonds and other debt securities held by the MBS Bond Fund may not be able to make interest or principal payments.

·
Prepayment Risk.  Issuers of securities held by the MBS Bond Fund may be able to prepay principal due on these securities, particularly during periods of declining interest rates.  Securities subject to prepayment risk generally offer less potential for gains when interest rates decline, and may offer a greater potential for loss when interest rates rise.  When debt obligations are prepaid or when securities are called, the Fund may have to reinvest in securities with a lower yield.  Prepayment risk is a major risk of mortgage-backed securities.

·
Extension Risk.   An issuer may pay principal on an obligation held by the Fund (such as an asset-backed or mortgage-backed security) later than expected.  This may happen during a period of rising interest rates.  Under these circumstances, the value of the obligation will decrease.

·
Risks Associated with Mortgage-Backed Securities.  These risks include Market and Regulatory Risk, Interest Rate Risk, Credit Risk, Prepayment Risk and Extension Risk (each described above).  During periods of difficult or frozen credit markets, significant changes in interest rates, or deteriorating economic conditions, such securities may decline in value, face valuation difficulties, become more volatile and/or become illiquid.

·
Risks Associated with Real Estate and Regulatory Actions.  Although some of the securities in the Fund are expected to either have a U.S. Government sponsored entity guarantee or be AAA rated by any NRSRO, if real estate experiences a significant price decline, this could adversely affect the prices of the securities the Fund owns.  In addition, any adverse regulatory action could impact the prices of the securities the Fund owns.

·
Liquidity Risk.  Reduced liquidity in the bond markets can result from a number of events, such as limited trading activity, reductions in bond inventory, and rapid or unexpected changes in interest rates. Less liquid markets could lead to greater price volatility and limit the Fund’s ability to sell a holding at a suitable price.

·
Derivatives Risk.  Derivatives involve the risk of improper valuation, the risk of ambiguous documentation and the risk that changes in the value of the derivative may not correlate closely with the underlying security.  Losses from a derivative instrument may be greater than the amount invested in the derivative instrument. Certain derivatives have the potential for unlimited losses, regardless of the size of the initial investment.

·
TBA Securities Risk.  In a TBA transaction, a seller agrees to deliver a security at a future date, but does not specify the particular security to be delivered.  Instead, the seller agrees to accept any security that meets specified terms.  TBA transactions involve the risk that the securities received may have less favorable characteristics than what was anticipated when the Adviser entered into the transaction. Adviser accounts with TBA securities are also subject to counterparty risk and will be exposed to changes in the value of the underlying investments during the term of the agreement.

·
Dollar Roll Risk.  Dollar rolls involve the risk that the MBS Bond Fund’s counterparty will be unable to deliver the mortgage-backed securities underlying the dollar roll at the fixed time.  If the buyer files for bankruptcy or becomes insolvent, the buyer or its representative may ask for and receive an extension of time to decide whether to enforce the Fund’s repurchase obligation.  In addition, the Fund earns interest by investing the transaction proceeds during the roll period.  Dollar roll transactions may have the effect of creating leverage in the Fund’s portfolio.

·
Portfolio Turnover Risk.  A high portfolio turnover rate (100% or more) has the potential to result in the realization and distribution to shareholders of higher capital gains, which may subject you to a higher tax liability.  A high portfolio turnover rate also leads to higher transactions costs.

·
Risks Associated with Inflation and Deflation. Inflation risk is the risk that increasing prices throughout the economy may erode the purchasing power of an investment over time.  Deflation risk is the risk that prices throughout the economy decline over time — the opposite of inflation.

·
Government-Sponsored Entities Risk.  Securities issued or guaranteed by government-sponsored entities, including GNMA, FNMA and FHLMC, may not be guaranteed or insured by the U.S. Government and may only be supported by the credit of the issuing agency.

·
Asset-Backed Securities Risks.  These risks include Market and Regulatory Risk, Interest Rate Risk, Credit Risk, Prepayment Risk and Extension Risk (each described above).  Asset-backed securities may decline in value when defaults on the underlying assets occur and may exhibit additional volatility in periods of changing interest rates.

·
Counterparty Risk.  Fund transactions involving a counterparty are subject to the risk that the counterparty or a third party will not fulfill its obligation to the MBS Bond Fund.  Counterparty risk may arise because of the counterparty’s financial condition (i.e., financial difficulties, bankruptcy, or insolvency), market activities and developments, or other reasons, whether foreseen or not.  A counterparty’s inability to fulfill its obligation may result in significant financial loss to the Fund.
Risk Lose Money [Text] rr_RiskLoseMoney Losing all or a portion of your investment is a risk of investing in the MBS Bond Fund.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The following performance information provides some indication of the risks of investing in the MBS Bond Fund.  The bar chart shows the annual returns for the Fund from year to year.  The table shows how the Fund’s average annual returns for the 1-year, 5-year, 10-year and since inception periods compare with those of a broad measure of market performance.  The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.  Updated performance information is available on the Fund’s website at www.pacificincome.com/mutual-funds or by calling the Fund toll-free at 1-800-251-1970.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following performance information provides some indication of the risks of investing in the MBS Bond Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-251-1970
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.pacificincome.com/mutual-funds
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance (before and after taxes) is not necessarily an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns as of December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
During the period shown on the bar chart, the MBS Bond Fund’s highest total return for a quarter was 2.65% (quarter ended June 30, 2010) and the lowest total return for a quarter was ‑2.02% (quarter ended December 31, 2016).
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel highest total return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2010
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 2.65%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel lowest total return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2016
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.02%)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate The after-tax returns were calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold shares of the MBS Bond Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher The Return After Taxes on Distributions and Sale of Fund Shares is higher than other return figures when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock
The after-tax returns were calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.  Actual after-tax returns depend on an investor’s tax situation and may differ from those shown, and after-tax returns are not relevant to investors who hold shares of the MBS Bond Fund through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).  The Return After Taxes on Distributions and Sale of Fund Shares is higher than other return figures when a capital loss occurs upon redemption and provides an assumed tax deduction that benefits the investor.
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (for the periods ended December 31, 2018)
PIA MBS Bond Fund | Bloomberg Barclays U.S. MBS Fixed Rate Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Bloomberg Barclays U.S. MBS Fixed Rate Index (reflects no deduction for fees, expenses or taxes)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.99%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.54%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.12%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.97%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 28, 2006
PIA MBS Bond Fund | Managed Account Completion Shares  
Risk/Return: rr_RiskReturnAbstract  
SHAREHOLDER FEES (fees paid directly from your investment) rr_ShareholderFeeOther none
Management Fees rr_ManagementFeesOverAssets none [1]
Other Expenses rr_OtherExpensesOverAssets 0.34%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.34%
Less: Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.11%) [2]
Total Annual Fund Operating Expenses After Expense Reimbursement rr_NetExpensesOverAssets 0.23%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 24
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 98
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 180
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 420
Annual Return 2009 rr_AnnualReturn2009 6.08%
Annual Return 2010 rr_AnnualReturn2010 5.11%
Annual Return 2011 rr_AnnualReturn2011 5.48%
Annual Return 2012 rr_AnnualReturn2012 2.83%
Annual Return 2013 rr_AnnualReturn2013 (1.43%)
Annual Return 2014 rr_AnnualReturn2014 5.92%
Annual Return 2015 rr_AnnualReturn2015 1.23%
Annual Return 2016 rr_AnnualReturn2016 1.66%
Annual Return 2017 rr_AnnualReturn2017 2.35%
Annual Return 2018 rr_AnnualReturn2018 0.75%
Label rr_AverageAnnualReturnLabel PIA MBS Bond Fund Return Before Taxes
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.75%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.36%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 2.97%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 3.82%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Feb. 28, 2006
PIA MBS Bond Fund | Managed Account Completion Shares | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel PIA MBS Bond Fund Return After Taxes on Distributions
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (0.38%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.11%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.59%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 2.21%
PIA MBS Bond Fund | Managed Account Completion Shares | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel PIA MBS Bond Fund Return after Taxes on Distributions and Sale of Fund Shares
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 0.43%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 1.24%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 1.73%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 2.34%
[1] Pacific Income Advisers, Inc. (the "Adviser') will not charge a fee for its advisory services to the MBS Bond Fund. However, investors in the Fund are clients of the Adviser and pay the Adviser an advisory fee to manage their assets, which include assets invested in the Fund.
[2] The Adviser has agreed to temporarily pay for all operating expenses (excluding acquired fund fees and expenses ("AFFE") incurred by the Fund through at least March 29, 2020 to the extent necessary to limit Total Annual Fund Operating Expenses for the Fund to 0.23% of the Fund's average daily net assets (the "temporary expense limitation"). The temporary expense limitation may be discontinued at any time by the Board of Trustees. The Adviser may not recoup amounts subject to the temporary expense limitation in future periods. The table shows the net expenses of the Fund as 0.23% reflecting the fact that the Fund is used to implement certain fixed-income strategies that are offered to Eligible Investors (as such are defined in the statutory prospectus). Investors should carefully consider the separate fees charged in connection with investment in the Fund. AFFE are the indirect costs of investing in other investment companies, such as a money market funds.