Can I combine a conventional and private loan for mortgage?

[John McCormack]

What if our primary lender is only willing to loan 80% LTV for a duplex I'll be living in one side of, can I then come up with a bit more cash through a private lender such as Prosper or Lending Club or personal friend? I'm not sure if this counts as a gift, how/should I document it, will my primary lender frown upon this and throw a red flag up etc? Just trying to make sure we don't make any preventable mistakes.

The reasoning behind this is that we'd like to have some more cash on hand for repairs immediately after closing so that we could make one side of duplex rent ready in the least amount of time. 

Thanks much in advance to all the BP'ers who've taken time out to answer as we appreciate being pointed in the right direction from people who have been there and done that:-) 

[Sarah Miller]

@John McCormack

 I would find a different lender. If you plan on living in one side of the duplex, you should be able to do only 10% down.  I think your bank is pulling your leg.