The phrase "bank issuer" refers to a bank that creates and distributes financial products such as credit cards or banknotes. They are responsible for issuing these products to individuals or businesses. Full definition
If you have several cards with the same bank issuer, you may be able to transfer the available credit from the card you want to cancel to the card you want to keep. (wisebread.com)
Since that time, Chase has continuously expanded, growing as a company and merging with a number of notable banks, to become the largest bank issuer of consumer credit cards in the US. (cardrates.com)
So I think I'd have to agree with Kenny that it seems likely that Bank of America will be the new bank issuer for the new Amtrak Guest Rewards credit card when it comes out this fall! (pointswithacrew.com)