There is no way to discuss banking hemp growers without knowing where your bank is located; i.e. what state. This non advocacy web site
illustrates the amount of variety possible. Banks in my home state were initially reluctant to bank them, but most eventually decided that it was easy to verify state registration and, beyond that, it was just another customer.
A post in your state's forum might generate some useful information.
Hemp is a variety of cannabis. While it has a tremendous physical resemblance to marijuana, it contains no THC. The FinCEN and DOJ guidance talks about "marijuana," not hemp. Providing services to growers or sellers of a plant that can be grown legally under both state and federal law would not trigger a SAR filing responsibility.