A handful of banks that provide an early look at jumbo origination activity boosted volume in the second quarter of 2017, according to an analysis by Inside Nonconforming Markets. First Republic Bank funded $3.05 billion in single-family originations in the second quarter, up 21.0 percent from the previous period and a 4.1 percent increase from the second quarter of last year. Jumbos account for a large majority of the bank’s total production. “Overall, loan demand is strong, though ...