Cornerstone Bank Cornerstone Bank was formed in 2017, and was built on the foundation of two local, mutual banks joining together—SpencerBANK and Southbridge Savings Bank. Together, we have been proudly serving and supporting our customers and communities in Central Massachusetts since 1871 and 1848, respectively, and will continue to do so. Individually, we each made a positive difference in the lives of individuals and businesses in our communities and together, we can make an even greater impact. Cornerstone Bank Service…