Yep - i'd be surprised if even a tenth of all white-collar crime is known about.
Way back in the 90's I had a bank account that paid something like 5 percent interest, but only had a couple thousand dollars in it (maybe). I was between jobs and made no deposits for over a month - only withdrawals and only like 4 of them. I got to wondering about the interest and calculated it various ways. Calling the bank, they confirmed verbally that they use the average daily balance. By my calculations they exactly used the final balance (the minimum for the month). I concluded that someone somewhere realized that changing from "average" to "minimum" would make the bank a few extra bucks. Not a big difference if your balance is fairly stable, but a big deal if it's more volatile. They eventually got bought out a couple times, and interest rates are a joke now anyway.
You thought wrong. White-collar crime is effectively any crime that does not involve physical effort. Breaking and entering to steal a few dollars can get you months in jail. Pumping and dumping a stock can get you a sports car and a holiday home in the Cayman Islands.
That's not my understanding of the term "white-collar crime", nor is it the definition used here, for example: https://en.wikipedia.org/wiki/White-collar_crime
The interest calculation problem you describe would fall under what I think is the usual definition of "white-collar crime".
But unless an individual found a way to "take the difference" they would not personally benefit. I'd call that one fraud on the part of the bank, and if it was caught and dealt with the bank might pay a fine but nobody would go to jail. I consider "white collar crime" something that an individual could be charged for, but maybe that's not the legal definition.