Key insight: BMO Financial Group has tapped a new CFO who will start in January.Expert quote: The bank's incoming CFO is a "dynamic, strategic finance leader," BMO CEO Darryl White said.Supporting data: BMO is trying to achieve a return on equity of 12% in the U.S.BMO Financial Group in Toronto named a new chief financial officer ahead of the anticipated retirement of Tayfun Tuzun, who's played a key role in the bank's efforts to expand stateside. Rahul Nalgirkar, who has been the finance chief of BMO's U. ...