With residential production falling by as much as 20 percent in the fourth quarter, a handful of lenders recently have either pulled out of the retail market entirely or pared back their traditional branch networks. Included in the club of retail quitters are such firms as Ditech Financial – ranked 13th overall in fundings – and Stonegate Mortgage, which began its pullback in November. Also heading for the retail exit is BankUnited, Miami Lakes, FL. All three are...