After experiencing slight growth in its mortgage business this summer and anticipating more, Chase Bank plans to hire up to 175 full-time employees for its Cleveland mortgage operations center by the end of the quarter. That maximum number would represent 40% growth in Chase’s local work force, which bank spokeswoman Mary Kay Bean estimated at 440. New mortgage loans, including refinancing, totaled $32.2 billion companywide in the second quarter — up 2% from the first quarter but down 22% in comparison to the second quarter of 2009.