According to the National Bank of Sallisaw website, customers with accounts at the Oklahoma bank can already conduct business at any of the 31 ATMs and 25 full-service branches in western Arkansas and eastern Oklahoma that are now under First Bank Corp. — First National Bank of Fort Smith, Citizens Bank & Trust Co. in Van Buren, First National Bank of Rogers, and Brown-Hiller-Clark & Associates in Fort Smith and Sallisaw. First Bank Corp. has consolidated assets of $1.5 billion.