West Coast Bancorp: The Orange-based multibank holding company posted record earnings for the third quarter of $761,000, up 40% from the $542,000 reported for the comparable 1988 quarter. Net income for the first nine months of the year increased 38%, to $1.4 million from $1 million. Total assets rose 23%, to $468.5 million from $380.3 million. West Coast, formerly Centennial Beneficial Corp. has four subsidiaries: Sunwest Bank, Sacramento First National Bank, Heritage Thrift & Loan Assn. and West Coast Realty Finance.