For a small customer like yourself, nothing more than ID is required, which you've supplied. Once you start moving decent amounts of cash, the institution receiving the money is required to know something about the activities the cash came from. It doesn't matter that the currency was BitCoins; the same rules still apply. There are reports to file, records to keep, etc. For instance, a bank is expected to report activities like a hot dog cart suddenly depositing stacks of $20's well out of proportion to a plausible amount of sales.
Not complying with these rules (which is "Financial Institution Regulatory Framework 101") is not going to end well.
Mt. Gox was a shoestring operation that got in WAY over its head. (As in, actual banks have entire departments of employees dedicated to pretending to comply with these kinds of rules, warehouses (or tape libraries) full of documents stored away, etc.)