Although residential originations fell by roughly 15 percent in the fourth quarter on a sequential basis, warehouse lenders saw their commitments inch up slightly, according to new figures compiled by Inside Mortgage Finance. At Dec. 31, warehouse banks had extended an estimated $49.0 billion of commitments to non-depository lenders, a 2.1 percent sequential gain. Compared to yearend 2014, commitment levels rose a handsome 28.9 percent. Part of the reason for the increase in activity – especially year-over-year – can be explained...[Includes one data table]