I have been using UOB Korat but last time to get statements/transaction listing took 4 hours on the day 'had to go thru head office'. And even then the transaction report had to be a screen dump!. Immi was not pleased but accepted it and told me to change my bank before next time. Now I have a krungsi account. Don't recommend UOB!
Slight correction here. Officially 1900b, but overall you're going to spend maybe 3k baht which includes the official visit to your house afterwards. . .
Bank book and statements showing 3 months history and the last 2 months balance in excess of 400k baht. Dated the day of your application and including a signed letter from the bank stating that these docs are all true and correct!