FWIW, "banker" doesn't seem to be a direct BLS job description. However, it seems that at least some bankers will describe themselves as a "banker" in the US Census, as there is a mapping from the census job title "banker" to the Occupational Classification System (OCS) term 'B007 FINANCIAL MANAGERS'.
See https://www.bls.gov/ncs/ocs/ocsm/comba-be.htm which links the census term to https://www.bls.gov/ncs/ocs/ocsm/comB007.htm .
> B007 FINANCIAL MANAGERS Management and management related occupations in the financial field of banking, trust companies, credit agencies, investment agencies etc. Workers in this occupation are concerned with the management of financial affairs. Include the following occupations:
> Bank Cashier, Branch Manager, Comptroller, Credit Union Manager, Controller, Treasurer, Financial Director, Investment Manager, Accounting Department Manager, Accounts Supervisor, Auditing Department Manager
"Bank teller" has its own OCS entry, "D383 BANK TELLERS", at https://www.bls.gov/ncs/ocs/ocsm/comd383.htm :
> Exclude Cashiers (C276).
> Receive and pay out money and keep records of money and negotiable instruments involved in various bank transactions
Lawyers, software developers, and cleaning staff have their own OCS classifications and likely rarely call themselves a "banker" in the census.
The financial industry uses the term "banker" along the lines described at https://financialcareeroptions.com/financial-careers/financi... :
> A banker is an employee of a bank or financial institution who services the financial needs of clients. These clients can be individuals or institutions, both with different needs. A banker tries to maximize the profit of a bank while maintaining appropriate risk levels.
> Essentially, bankers raise capital to make loans and investments. They charge interest and fees for the services and seek profit on the investments
A teller, for example, does not do those tasks.