Did you try calling one of the contact people listed on the cover letter to the new Q&A? They're meant to be the experts.
From what you describe, it doesn't sound to me like you meet any of the three prongs of the "on behalf of" test. In order for a referral to be "on behalf of' the Bank, you have to have a contractual arrangement to receive a commission for the referral. Referral fees to tellers ,etc. specifically do not trigger the "on behalf of" rule.
The only thing I would watch out for is does the Bank's name appear on any of the insurance sub's documents or marketing materials?
32 days to October 1 and counting.
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The opinions expressed are mine and not those of my employer