Lenders have loosened downpayment requirements on conforming purchase-mortgages as part of a shift that typically occurs when the purchase market rebounds. The move toward higher loan-to-value ratios on purchase mortgages has been gradual, but industry analysts suggest it’s part of an effort by lenders to increase volume. “As lenders need more mortgage volume, average downpayments start to drop,” said Doug Lebda, CEO of LendingTree. “More lenders are beginning to loosen their guidelines and are going after a slightly broader pool of potential borrowers.” According to the Inside Mortgage Finance MBS Database, the original LTV ratio for newly originated purchase mortgages included in mortgage-backed securities issued by the government-sponsored enterprises has...