Three years ago, JPMorgan Chase became the first bank with a branch in all 48 contiguous states. "We're still at very low single-digit branch share, and we know that in order for us to really optimize our investment in these communities, we need to be at a higher branch share," Roberts said in an interview with CNBC. Wells Fargo and Bank of America closed the highest net number of branches, while JPMorgan was the most active net opener. According to FDIC research collated by KBW, growth in bank branches peaked right before the financial crisis, in 2007. When it comes to prioritizing locations for new branches, Roberts said it's a "balance of art and science."

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