Why People’s United Paid Only $327M for Belmont Savings Bank

The parent company of People’s United Bank completed its acquisition of the parent company of Farmington Bank in an all-stock transaction valued at $544 million nearly two months ago. Last week, People’s United announced it will buy the parent company of Belmont Savings Bank in an all-stock transaction valued at $327 million. Given that both banks hold about $3 billion in assets, what made the Farmington deal so much more lucrative than the Belmont deal?