High Quality Content by WIKIPEDIA articles! Rainier Bancorp was the Seattle-based parent corporation of Rainier National Bank, a Washington state-based bank with branches throughout the state. Rainier traced its roots back to the National Bank of Commerce, which was founded by Richard Holyoke in 1889. The name Rainier National Bank was adopted in 1974. Rainier Bancorp. expanded into Alaska with the purchase of People`s Bank Trust in 1983 and into Oregon in 1986, expanding further in Oregon in 1987 with the government assisted purchase of Lincoln S L Assoc. After a brief bidding war with First Bank System, Rainier Bancorp. was acquired by Security Pacific Corp. in 1987. At the time of its acquisition, it was the second largest bank in the state.