Pretend for a moment that Merrick receives a piece of memo from a subordinate that incriminates you in some form of bank fraud. Of course Merrick personally doesn't know anything about your bank account. Nobody has both the information and a brain big enough to store it. Hell, I have to check my own bank account regularly because I keep forgetting exactly how much is in there and it's my own money!
If something came across Merrick's desk and it convinced _him_ that it was worthwhile to investigate, do you really expect other than delays waiting for signed papers before he got the information he wanted? Do you really think there's a difference to Merrick whether he gets that information in 60 seconds by logging into your bank "as you" and looking at it, or whether he waits a few days and gets hand delivered a piece of paper by a bank's legal team?
[1] U.S. Attorney General and current chief law enforcement officer for the nation