I've worked at three big banks (in three different countries actually). We've always had access to stackoverflow.

This is nothing that can't be addressed through training. Questions on Stack Overflow with generic code actually get better responses than those bogged down with irrelevant details. You should strip out all labels, namess, even extraneous fields that don't matter. It makes for a more generic problem and solution pair that can help others as well, and eliminates the problem of leaking proprietary information.

Can you elaborate on this?