BankAmerica's next big acquisition came in 1992. The company acquired its California rival, Security Pacific Corporation and its subsidiary Security Pacific National Bank in California and other banks in Arizona, Idaho, Oregon, and Washington (which Security Pacific had acquired in a series of acquisitions in the late 1980s). This was, at the time, the largest bank acquisition in history. Federal regulators, however, forced the sale of roughly half of Security Pacific's Washington subsidiary, the former Rainier Bank, as the combination of Seafirst and Security Pacific Washington would have given BankAmerica too large a share of the market in that state. The Washington branches were divided and sold off to West One Bancorp (now U.S. Bancorp) and KeyBank.[33]Later that year, BankAmerica expanded into Nevada by acquiring Valley Bank of Nevada.
In 1994, BankAmerica acquired the Continental Illinois National Bank and Trust Co. of Chicago, which had become federally owned as part of the same oil industry debacle emanating from Oklahoma City's Penn Square Bank, that had brought down numerous financial institutions including Seafirst. At the time, no bank had the resources to bail out Continental, so the federal government operated the bank for nearly a decade. Illinois at that time regulated branch banking extremely heavily, so Bank of America Illinois was a single-unit bank until the 21st century. BankAmerica moved its national lending department to Chicago in an effort to establish a financial beachhead in the region.
These mergers helped BankAmerica Corporation to once again become the largest U.S. bank holding company in terms of deposits, but the company fell to second place in 1997 behind fast-growing NationsBank Corporation, and to third in 1998 behind North Carolina's First Union Corp.
On the capital markets side, the acquisition of Continental Illinois helped BankAmerica to build a leveraged finance origination and distribution business (Continental Illinois had extensive leveraged lending relationships) which allowed the firm’s existing broker-dealer, BancAmerica Securities (originally named BA Securities), to become a full-service franchise. [34][35] In addition, in 1997, BankAmerica acquiredRobertson Stephens, a San Francisco-based investment bank specializing in high technology for $540 million. Robertson Stephens was integrated into BancAmerica Securities and the combined subsidiary was renamed BancAmerica Robertson Stephens.[36]