I agree with Don - don't cite a number. Let your report speak to the specific findings (x overdrafts in the last y months), the regulatory language from Reg. O, and a discussion of the risk to the bank if it continues. If management wants to argue about the definition of 'inadvertent', let them do so in their response to the review.
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Opinions are Bartman's, not those of my employer. "A noble spirit embiggens the smallest man."