In the past they did not require any money in a Thai bank which was convenient if you did not want to keep 400,000 baht in a Thai bank. It is hard to ascertain but their requirements are still a bit easier than in Thailand. Usually you must have the money in the bank for a period of time but Savannakhet does not seem to enforce this as far as anyone can tell. Also instead of dealing with Thai Immigration- family visits, photos of home, map of home etc- you can just exit and re-enter, suitable if you do not live in Thailand permanently. I think a kor ror 22 is similar but issued if you have married abroad.