Existing loan
-- according to A. Lyng Svenson's Samfundslitteraturs Økonomisk Ordbog.

This does depend somewhat on context.

It means a loan paid in somewhere.
If I have a loan like this, it means the money I have borrowed is deposited in my account.

Try this link, which is free and reliable:
http://www.regnskabsordbogen.dk/regn/dkgb/dkgbregn.aspx

It does not have an entry for indestående lån, but if you look up indestående
in the dansk-engelsk ordbog it may help.