What is hidden in the Dodd Frank Bill?

The Dodd-Frank bill stipulates that, in the event of a bank failure, the derivative holders will be paid off first and the account holders will be unsecured shareholders in the bank. This bail-in would wipe out our accounts. How would such a “wealth tax” be implemented and at what percentage? Just confiscation from dollar accounts or also from precious metals and foreign currencies? I ask this because a financial writer shared a troubling email from a subscriber who had talked with his credit union manager, who claimed that the credit union had been contacted by Homeland Security asking if the credit union would participate in the bail-in or suffer the consequences.​