Fire the board and all the senior executives, announce a one-month grace period during which no new internal policies will be promulgated, seek a temporary continuance in any ongoing legal cases, and require the firm to undergo a total audit by a new external auditor. Set up a new firm, raise money through an IPO, do a mandatory buyback of all outstanding shares in the original company, and shut it down.
Since the bank isn't actually insolvent, this is much less drastic than winding it up. Of course it's far more complex than I'm outlining here and might take 6 months or a year. But if corporations can always rely on 'too big to fail' then what good is enforcement? A corporate charter that can't ever be withdrawn is basically a license to commit crime in perpetuity by shuffling the personnel.
If we're giving out personal rights without any of the accompanying responsibilities then how do you expect people to maintain any respect for the legal system? It's rather obviously in decline, not least through episodes such as this.