Southwest Bancorp, Inc. operates as the holding company for the Bank SNB that provides commercial and consumer banking services. It operates through five segments: Oklahoma Banking, Texas Banking, Kansas Banking, Mortgage Banking, and Other Operations. The company provides commercial deposit, commercial checking, money market, and other deposit accounts; and retail deposit services, such as certificates of deposit, money market accounts, checking accounts, negotiable order of withdrawal accounts, savings accounts, and automatic teller machine access. It also offers commercial lending services, including commercial real estate, working capital, and construction loans; loans for small business, equipment and general business expansion, and energy companies, as well as for health care providers, businesses, and related concerns; and consumer lending services comprising residential real estate loans and mortgage banking services, personal lines of credit, automobile loans, and other installment loans. In addition, the company provides Bank SNB Digital Lockbox, an automated lockbox, document imaging, and information service for commercial customers; and personal brokerage and Internet banking services. It operates 23 full-service banking offices, including 12 in Oklahoma, 7 in Texas, and 4 in Kansas. Southwest Bancorp, Inc. was founded in 1894 and is headquartered in Stillwater, Oklahoma.