Hello! We do have a vendor management policy and standard which provide guidelines for when the RFI/RFP process should be used. There are a variety of factors which could trigger the RFP process, such as overall cost (select a threshold, for example $50-100k or more), criticality of the service performed, whether or not the service will impact earnings, access to sensitive data, number of departments impacted, etc. For example, if replacing an online banking platform, which is a critical service with a high cost, access to sensitive data, and impacting multiple departments, an RFP would be required.
When replacing a landscaper or ordering teller mats, an RFP would not necessarily be required. Even so, with less critical items, such as teller mats or copiers, if replacing mats/copiers for 100 branches, it may be beneficial to follow a less formal RFP process and achieve cost savings.
Hope that helps.