The full form of CNN in banking, in at least one known instance, refers to Citizens & Northern Bank.
Specifically, CNN BANK is a Pennsylvania banking corporation that operates as a wholly-owned subsidiary of Citizens & Northern Corporation (also CNN). This indicates that the abbreviation is a company-specific name, not a general acronym used across the banking industry.
Therefore, while CNN is widely known as Cable News Network, in the context of banking, it can represent Citizens & Northern Bank.
