Jumbo mortgage production last year grew its share of total originations to its highest level since well before the financial collapse that launched the era of the “agency jumbo” loan. Mortgage lenders cranked out a total of $291.1 billion of home mortgages with loan balances exceeding the old conforming loan limit of $417,000. Like everything else in mortgages, jumbo production was down from 2013, by 22.4 percent. But total mortgage originations fell...[Includes three data charts]