v3.26.1
S000005599 [Member] Investment Risks - Wilmington New York Municipal Bond Fund
Apr. 30, 2026
Municipal Securities Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
  •   Municipal Securities Risk. The Fund will likely be impacted by events tied to the overall municipal securities markets. Those markets can be volatile and significantly affected by unfavorable legislative or political developments and adverse changes in the financial conditions of municipal securities issuers and the economy. Further, a fund that invests in the securities of a particular bond market sector (e.g., healthcare, housing or one political subdivision) is subject to the risk that adverse circumstances will have a greater impact on the fund than a fund that does not make such sector investments. It is possible that economic, business or political developments or other changes affecting one security in the sector will affect other securities in that sector in the same manner.
New York Investment Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
  •   New York Investment Risk. The Fund will be more susceptible to any economic, business, political or other developments which generally affect securities issued by New York issuers. The economy of New York state is large and diverse, from agriculture, manufacturing and high technology in upstate counties to advertising, finance and banking in New York City. Any major changes to the financial conditions of New York City, however, would ultimately have an effect on the state.
Market Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]
  •   Market Risk. There is a risk that the value of the Fund’s investments may decrease in response to expected, real or perceived economic, political or financial events in the U.S. or global markets. The frequency and magnitude of such changes in value cannot be predicted. Certain securities and other investments held by the Fund may experience increased volatility, illiquidity, or other potentially adverse effects in response to changing market conditions, inflation, changes in interest rates, trade disputes, changes in trade regulation or economic sanctions, elevated levels of government debt, internal unrest and discord, lack of liquidity in the bond markets, market disruptions caused by local or regional events such as war, acts of terrorism, the spread of infectious illness (including epidemics and pandemics) or other public health issues, recessions, the threat or occurrence of a government shutdown, or other events or adverse investor sentiment or other political, regulatory, economic and social developments, and developments that impact specific economic sectors, industries or segments of the market.
Liquidity Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
  •   Liquidity Risk. The risk that certain securities may be difficult or impossible for a Fund to sell or dispose of at the price at which the Fund has valued the security.
Changing Fixed Income Market Conditions Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
  •   Changing Fixed Income Market Conditions Risk. Interest rates have changed due to changes in Federal Reserve Bank (FRB) monetary policy actions, as well as the monetary policy responses of other central banks around the world. In addition, decreases in fixed income dealer market-making capacity may also potentially lead to heightened volatility and reduced liquidity in the fixed income markets. As a result, the value of the Fund’s investments and share price may decline. Changes in central bank policies could also result in higher than normal shareholder redemptions, which could potentially increase portfolio turnover and the Fund’s transaction costs.
Call Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
  •   Call Risk. Issuers of callable securities may redeem the securities prior to maturity at a price below their current market value.
Credit Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]
  •   Credit Risk. There is a possibility that issuers of securities in which the Fund invests may default in the payment of interest or principal on the securities when due, which would cause the Fund to lose money.
Interest Rate Risks [Member]  
Prospectus [Line Items]  
Risk [Text Block]
  •   Interest Rate Risk. The risk posed by the fact that prices of fixed income securities rise and fall inversely in response to interest rates changes. For instance, a rise in interest rate causes a fall in the value of a fixed income security. In addition, this risk increases with the length of the maturity of the fixed income security. Accordingly, the yield earned by a Fund will vary with changes in interest rates. Also, when interest rates fall, the price of mortgage-backed securities may not rise to as great an extent as that of other fixed income securities. Duration is a measure of the expected life of a debt security that is used to determine the sensitivity of the security’s price to changes in interest rates. Generally, the longer the Fund’s duration, the more sensitive the Fund will be to changes in interest rates.
Alternative Minimum Tax Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
  •   Alternative Minimum Tax Risk. Although the interest received from municipal securities generally is exempt from federal income tax, the Fund may invest a portion of its total assets in municipal securities subject to the federal alternative minimum tax. Accordingly, investment in the Fund could cause noncorporate shareholders to be subject to (or result in an increased liability under) the federal alternative minimum tax.
Tax Risk [Member]  
Prospectus [Line Items]  
Risk [Text Block]
  •   Tax Risk. Failure of a municipal security to meet certain legal requirements may cause the interest received and distributed by the Fund to shareholders to be taxable, which could result in a decline in the security’s, and therefore the Fund’s, value.
Risk Lose Money [Member]  
Prospectus [Line Items]  
Risk [Text Block] All mutual funds take investment risks. Therefore, it is possible to lose money by investing in the Fund.
Risk Not Insured Depository Institution [Member]  
Prospectus [Line Items]  
Risk [Text Block] An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.