Pros
Initially, the company was somewhat functional. Esprit de Corps was somewhat lacking in the office of 700 employees, but was pretty good with my immediate team, which was spread around the country.
Cons
It became increasingly evident that the company was a mess. Prior to Mitsubishi purchasing Union Bank, UB had a great reputation and excellent workplace culture. But Mitsubishi bought several banks in a short period and tried (read: didn't succeed) to merge them all. The technologies at each bank never successfully merged. For example, I would receive "undeliverable" replies to colleagues in the other banks because the email systems didn't talk with each other. Management was asked to work longer and longer hours, with no additional pay. Yes, I was salaried, but 60 hours a week? For under 6 figures? I eventually burned out, and most of upper management left. Glad to be out of there! I don't know what it's like now that it's part of US Bank, but it certainly can't be any worse.