Trojan.Agent refers to a generic Trojan malware detection. It is used for detections that are either associated with no specific malware families or not enough information is available to pinpoint the malware family.
Trojan.Banker is the generic detection for Trojans that steal banking information from an affected system.
Malwarebytes can remove Trojan.Banker without further user interaction. However, it is recommended to determine what information was stolen so users can mitigate further losses due to the security breach.