Redwood Trust has recently put an increased emphasis on acquiring purchase mortgages. The loans have higher loan-to-value ratios than refinances included in Redwood’s non-agency mortgage-backed security issuance, a potential concern according to Kroll Bond Rating Agency. Redwood said it acquired $955 million in purchase mortgages from its correspondent lenders in the first quarter of 2013, up from $550 million the previous quarter. The purchase-mortgage share of Redwood’s acquisitions is also increasing ...