"I think it works the same as with dogs – the closer a farmer’s bond is with his animals, the easier it is for them to pick up his accent."
Well of course they do. Accents are more than localized vowel sounds… they represent the way any group localizes its behavior. That means that bankers have a regional "accent" in the way they do business, and so do stamp collectors. The closer an organization gets to its regional customers, the more likely it is to understand the local dialect.