A Bank I used to work at had a story like this. More of a legend, really. It's been somewhat tainted by some recent news, but still interesting:

A woman who worked at the bank got promoted to a different department, so a new person began looking after all of her old clients. But something didn't add up. Her replacement noticed that her clients were complaining that their credit reports indicated more Bank™ debt than they actually had. Like, multiple credit cards with huge limits, all of them maxed to the hilt.

Turns out, our promoted friend from before was waiting for elderly clients to apply for credit so she could use their personal information, open a completely new profile for them, then apply for/approve credit cards for them. She was sending the cards to her own address, racking them up most of the way, making small payments to them and essentially just waiting for them to die. Once that happens, it all just gets written off by either the bank or the executor. "Oh I guess aunt Meg had more debt than she let on!" Sort of thing.

She got caught, fessed up. The bank ended up just sweeping the debts (approx $100k) under the table, forgiving them and apologizing to the clients for the "administrative error".

She got fired, obviously.