My question is the counting of "refinance of home purchase loans". How do we track the refinance of home purchase loans? Is this only for loans that we refinanced that were already on our books?
"Refinance" is for ANY loans where your loan is paying off an existing loan - whether the original loan was at your bank or another AND whether the original loan was to purchase or for any other reason. IOW, the definition of "refinance" is pretty encompassing. All you need to a new, dwelling secured loan that satisfies and replaces and existing dwelling secured loan by the same borrower [1003.2(p)].
Also, how would we know if the refinance from another institution was originally a home purchase loan, other than a statement from the borrower and how would we track this?
You can't just look at loans on your books that are refinanced. You can't look at purchases that are refinanced.