Stillwater National Bank and Trust Company is a subsidiary of Southwest Bancorp. Stillwater National Bank was founded in 1894. The bank and trust maintains its headquarters in Stillwater, Okla. It also maintains additional offices in Oklahoma, Kansas and Texas. Stillwater National Bank and Trust Company offers commercial and consumer lending, deposit, investment services, specialized cash management, consulting and other financial services. The bank and trust company also offers specialized consulting services that are deliver through affiliates that are subsidiaries of Southwest Bancorp. Business Consulting Group provides strategic planning, process analysis and assessment. Healthcare Strategic Support is a health care consulting company that specializing in helping health care organization streamline complex business processes.