What American banks have the best fees for ATMs internationally and work well in thailand?

Thanks for accepting me to the group. I will plan an unexpected early retirement this year and then move to Thailand soon. Intital retirement visa to get into the kingdom should be no problem. As I recon I have to do a 1yr extension and re-entry permit once I have arrived in Bkk. The question is: which bank does the 800K THB have to be in? i heard it must be a government bank? They have branches at the CW Immi Office? (I already have an account with Kasikorn for many years)