NEW YORK — PNC Financial said Monday that it plans to buy Colorado-based FirstBank for $4.1 billion, giving PNC a substantial presence in the Colorado banking market as well as Arizona.

Based in Lakewood, Colo., FirstBank, which is also branded as 1stBank, is a midsized bank that operates 120 retail branches with $26.7 billion in assets. The bank is privately held, but the banks disclosed that the stockholders of FirstBank who collectively own 45.7% of the shares have already voted in favor of the merger.

“Its deep retail deposit base, unrivaled branch network in Colorado, growing presence in Arizona, and trusted community relationships make it an ideal partner for PNC,” said Bill Demchak, chairman and chief executive officer of PNC, in a statement.

PNC has been on an acquisition streak

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