Columbia Savings & Loan Assn., Beverly Hills, said it will sell its nine residential lending branches and loan processing centers in Northern California. None of its seven residential lending branches in Southern California will be affected. Lawrence K. Fish, president and chief operating officer, said the branches will be put up for sale as a unit, but that Columbia would consider offers for individual branches. Those not sold by year-end will probably be closed. The branches are in Concord, Menlo Park, Mill Valley, Sacramento, San Jose, San Mateo, San Ramon, Santa Rosa and Sunnyvale. Fish said Northern California loans would be serviced by Columbia’s administrative office in Irvine.