When a bank is sold, rivals inevitably see the ensuing tumult as an opportunity to hunt for disgruntled customers.

An uptick in deal activity the past few years has created plenty of such feeding frenzies. New owners have taken control of branches that account for more than 20% of total deposits in about 50 markets around the country since the middle of 2011. In another 100 markets, branch asset turnover has exceeded 10%. (See the following graphic. Interactive controls are described in the captions. Text continues below.)

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