Lenders will require PMI insurance on a mortgage if the loan to propery value is greater than 80%. This is to protect them in case of a defualt on the mortgage.
This can be an advantage to a homebuyer who does not have 20% to put down on a new property they wish to purchase. It allows them to put down a lower amount and pay PMI to protect the lender.
The disadvantage is you are making a monthly payment for PMI you will never see again.
With todays market it is safe to say if you purchased a home in the year 2001 or earlier in the State of New Jersey you will have enough equity to exceed the 80% loan/property value. This makes it easy to remove the PMI insurance
To Remove PMI