odoo18/addons_extensions/hr_employee_extended/models/bank_details.py

from odoo import api, fields, models

class Bank(models.Model):
    _inherit = 'res.bank'

    branch = fields.Char(string='Branch')


class PartnerBank(models.Model):
    _inherit='res.partner.bank'

    full_name = fields.Char(string="Full Name(as per bank)")