Security Pacific National Bank (SPNB) was a large U.S. bank headquartered in Los Angeles, California. In 1967, Security First ... National Bank bought Pacific National Bank and became Security Pacific National Bank. In 1971, SPNB Security Pacific National Bank (SPNB) buys 69% of Bank of Canton. In 1975, Security Pacific Bank constructed a 55-story tower in downtown Los Angeles, now known as Bank of America Plaza. In 1992, Bank of America acquired SPNB. read more