I have had some experience with Credit Suisse regarding my mother's account that she opened in 1943-ish when she was a nursing student in Hergiswil, and maintained during her lifetime. In 1954 my mother immigrated to America, where she lived until she died in 2017.
I mother had added me to the account in the 1990s. I had bank statements from Credit Suisse, so I wrote a letter to the gentleman listed on the statements indicating that my mother had passed, and that I wanted to maintain the account, as is, so I could withdraw money when I was in Switzerland, which I was planning to do May to August 2018. I received a letter back from the bank stating that since my mother had passed I would have to close the account. WHAT?!?!?! WHY?!?!?!
Apparently Credit Suisse does not allow accounts belonging to Americans (unless you're Tina Tuner and have at least $500,000 CHF to deposit). Mama's account only had $72,000 CHF. I sent another letter stating when I would be in Switzerland, and that I would make an appointment with him to close the account. I called him when I was in Switzerland, to make an appointment, but he said an appointment was not necessary, all he needed was the routing and account number of my account in America. I asked why, when the account was opened when my mother was in her late teens, would I have to close it? Again I was told Credit Suisse does not hold accounts for Americans, so I had to close it in August 2018, at the end of my vacation there.
While I was in Switzerland, I went to UBS, which has branches in both Switzerland and America, to inquire if I could open an account there with the $72,000 CHF from Credit Suisse. The answer at UBS was also no, they do not wish to hold any accounts for Americans. I asked how much money would be needed to open an account and was told $400,000 CHF. Unbelievable.
For me, the saddest part about not being allowed to open a Swiss bank account is the fact that I want to rent or buy a small apartment for myself. I want to live in Switzerland because it's much more elderly friendly, but that's another story. I'll look into that the next time I'm in Switzerland, hopefully this summer.