Actually, the "bigger is better" concept to AAs is nothing new to CRA since the advent of the current CRA regulation back in 1995. But in answer to your question as to whether you can include only certain census tracts in the AA, the other responders to this forum gave you the correct answer of yes. I want to expand on that a bit.
The whole point of the AA concept in 1995 was to get away from the problem that arose in the old 12 assessment factor CRA regulation. That problem was that in one CRA exam, the examiners might tell you that your delineated community, as it was known then, was too small and that you should expand it. Then at the next exam, the examiners, maybe even the same ones, would tell you that your delineated community was too big and you should contract it. That drove bankers nuts,leading many to complain to Bill Clinton and his staff during the 1992 campaign. Clinton then directed the federal banking agencies to re-visit the CRA regualtion, which resulted in the current regulation and the AA concept.
A major tenet of that AA concept is that as long as your AA meets the criteria or restrictions in .41 of the regulation, examiners shouldn't be toying with the AA boundaries. End of discussion. These criteria/restrictions are:
o AAs must consist generally of one or more MSAs or metropolitan divisions, or one or more contiguous political subdivisions, such as counties, cities, or towns; and
o Include the geographies in which the bank has its main office, its branches, and its deposit-taking ATMs, as well as the surrounding geographies in which the bank has originated or purchased a substantial portion of its loans.
A bank may adjust the boundaries of its assessment area(s) to include only the portion of a political subdivision that it reasonably can be expected to serve; however, the AA:
o Must consist only of whole geographies (defined as census tracts);
o May not reflect illegal discrimination;
o May not arbitrarily exclude low- or moderate-income geographies; and
o May not extend substantially beyond an MSA boundary or beyond a state boundary unless the assessment area is located in a multistate MSA.
Meet all of these and your AA designation should be beyond reproach by examiners. AR.