I've always been amazed at what people will write on the memo line...
At a minimum, the conduct is unethical. However, a SAR filing is based on suspicion of criminality and I agree with Mr. Carey that it exists here.
Frankly (read cynically) I would anticipate some internal pushback about contacting the
bar association. The end result may jeopardize the repayment of your loan. (I don't see that your loan is worth 100 cents on the dollar as it is.) Nevertheless, I would not bring up contacting the
bar association until the SAR was in the mail.
The people who will have the most interest in what you have to say are
here. There is an array of possibilities and considerations, but it would be prudent to ask bank counsel to make the initial call without identifying your bank. You want a strategy that will prompt the
bar association to review the activity in the account without a direct accusation from your bank.
P.S. Loan proceeds were described as "working capital," deposited to a payroll account, then wired to a single entity? That's a red flag in its own right. Your "too busy" lender should be asking questions about that...