in theory, immigration rules are meant to permit a mixture of income and deposit, but Chiang Mai for one will only permit either 65k for 12 months or 800k and never the twain shall meet
The bank statement should specify that it's an international transfer. You'll need your bankbook, a copy of your bank book, the last 12 months' statements and a letter detailing the foreign transactions...this is what the BKK bank letter looks like