Defiinition of a performing loan?

General question here based on the Central Bank figures on arrears and non per-forming loans.
Is there a specific definition of a performing loan or does this depend?
For example if you are supposed to pay intererst and capital and are only paying interest is this no longer a performing loan? Whereas if the term was interest only it would be characterised as performing.

Perhaps not answering your query i would think a performing loan is one that has adhered to the repayment terms be they the original ones or maybe some later agreed alterations.