Mortgage warehouse providers ended the second quarter with $55.0 billion of commitments on their books, a 10.0 percent sequential improvement in a red-hot origination market, according to survey figures compiled by Inside Mortgage Finance. Compared to the same period a year earlier, commitment volumes were up 12.2 percent. But the real story was in lines drawn and “average outstandings,” which rose substantially. At Southwest Bank, for example, its commitment level increased...[Includes one data table]