Brian Simpson has dedicated the past three years to guiding an unprecedented and remarkable turnaround of Asheboro-based CommunityOne Bank back to profitability, including engineering a $310 million recapitalization and merging CommunityOne with Bank of Granite to form what’s now among the largest community banks in the state. Yet as CommunityOne (NASDAQ: COB) transitions from turnaround to growth, the $2 billion institution must focus on aggressive growth and drastic cuts in expenses — including…