Proof of Financial Capability: A bank statement showing a minimum balance of 500,000 THB (approximately $16,000 USD) or equivalent. If using a family bank statement, you must provide proof of relationship.
Note that the requirements for the DTV visa and making application with a Thai Consulate or Thai Embassy in the USA requires MORE THAN 500,000 THAI BAHT.
Currently they are requiring a bank account balance of US $16,000 or more in a bank account in your name only.