Mortgage loans were a little easier to get in May, according to the Mortgage Bankers Association. The MBA’s Mortgage Credit Availability Index increased 1.9% to 189.5 last month. Any increase in the index indicates that lenders are loosening their mortgage underwriting standards. The rise was led by a 6.8% jump in jumbo loan credit availability. Conforming mortgage loan credit rose 0.9% but government loan standards tightened with a 0.6% decrease in the index.