Are Banks Federal Gun Free Zones?

In the Facebook group, an open carrier mentioned he encountered an oft-heard rumor about carrying in a bank.

​Walked into my usual Bank Branch today, open carry as usual. Assistant Manager informs me that banks are federally chartered entities to which the same firearm regulations apply as to police stations and court houses in which only law enforcement and security is allowed to carry firearms. Now I have been carrying open for more than twenty years, including banks and in two different states. Nevada and Arizona. I never had a problem. 

Yes, banks are federally chartered and regulated, but in a financial sense. There are no gun prohibitions regarding your local bank or credit union. Let's recap:

• No federal laws or regulations
• No state laws or regulations

Furthermore, there are no federal laws regarding carrying in police station and courthouses. The federal law things in banks is a rumor, spread by misconception by people who don't know better.

In Nevada and most states, carrying a gun in  bank is only the crime of trespassing if you are asked to leave and you don't. Only in Montana is concealed carry illegal in bank (open carry is not) in the Inter-mountain West.