Mortgage bankers posted record profits on their loan origination and secondary market activity during the third quarter of 2012, according to a new Inside Mortgage Trends analysis of earnings reports from a diverse group of 10 lenders. The group, which included the four biggest lenders in the industry and eight of the top 20, reported a combined $5.344 billion in net production income during the third quarter, a record for the group. Production and secondary marketing income ... [Includes one data chart]