If the Fraud is against the Bank, you can give them anything they need to investigate the Fraud. I believe, (I am willing to be corrected) but I am not sure, you can tell them a SAR will be filed in this type of case.
If the Fraud is against a customer, you can only give them what the customer authorizes you to give the AG.
One question, why are you going to the AG first and not your local prosecutor or the police?
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Just my opinion for what it is worth