Southwest Bancorp, Inc. operates as a bank holding company for the Stillwater National Bank and Trust Company, and Bank of Kansas that provides commercial and consumer banking services in Oklahoma, Texas, and Kansas. It offers commercial deposit services, including SNB Digital Lockbox, commercial checking, money market, and other deposit accounts; and retail deposit services comprising certificates of deposit, money market accounts, checking accounts, NOW accounts, savings accounts, and automatic teller machine access. The company also provides commercial loans, such as commercial real estate loans, working capital and other commercial loans, construction loans, and loans to small businesses; and consumer loans consisting of student loans, residential real estate loans and mortgage banking services, and personal lines of credit and other installment loans. In addition, it offers personal brokerage and Internet banking services; credit cards; and integrated document imaging, cash management, and other financial services. The company operates 6 offices in Texas, 11 offices in Oklahoma, and 8 offices in Kansas. Southwest Bancorp, Inc. was founded in 1894 and is headquartered in Stillwater, Oklahoma.