PNC Bank has sued Republic Mortgage Insurance Co. for refusing to pay claims and attempting to rescind coverage on thousands of legacy mortgage loans that came with the bank’s acquisition of National City Corp. in 2008. In a complaint filed in federal district court in Pittsburgh last week, PNC Bank alleged that the North Carolina mortgage insurer refused to honor coverage it sold to National City under a “flow” policy and “pooling” policy between 1989 and 2005 by increasing its rescissions and cancellations. The flow policy provided...