As a Mortgage company they are not subject to CRA examination. As a Sub of the bank they can submit there own LAR and the Bank could claim the loans as an affiliate. If you do it this way the affiliate loans would only be used for the income and tract distribution portion of the lending exam. You will just need to let your exmainer know that you will be using affiliate lending. This should be done before they come in to do data integrity. If you are contiplating this you should discuss this with your regulator so they can tell you how they want to handle to proceed.
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Bubs-
"truth does not occur in the database" - Actual search result on a goverment website