Holding true to its prediction earlier this month that it had a buyer, Aames Investment says that it will merge with Accredited Home Lenders. The San Diego lender will spend $340 million for Aames in cash and stock. Officials say the proposed merger pairs mid-sized lenders with similar operating strategies and sales cultures. In particular, Accredited sees the deal as a way to extend its reach in the retail market, adding 76 Aames branches, while…