Surging streamline refinancing activity is helping boost FHA lending but the benefits of increased originations may be restricted to financial institutions that have the ability to retain servicing and are not dependent on selling FHA loans to larger banks, according to some lenders. Applications for government-insured refinance loans more than doubled last week as reduced mortgage insurance premiums for the FHA streamline refinances went into effect, according to the Mortgage Bankers Association’s latest survey of mortgage applications. The MBA’s government refinance index jumped from 4010 last week to...