And?
Most people don't actually need a bank branch - they need a cash machine.
Cheques can be posted, cash deposits can be machine-counted, BACS payments can be done online by definition.
People who live in the country go to town once every couple of weeks - they're used to it. What really winds the rustics up are things like the extortionate fuel and food prices, low wages, arsehole grockles buying up all the housing stock for holiday homes plus the national parks authorities and local councils making everything anyone wants to do either expensive or impossible.
Not having a building to visit is rather secondary to not having any money or choices.