The board of directors at Rollstone Bank & Trust (RBT), which has offices in Fitchburg, Leominster, Harvard and Townsend, has promoted two new assistant vice presidents and hired a new credit officer.

Roberta Parker has been promoted to assistant vice president of commercial lending. She joined RBT in 2004, became a credit analyst in 2005, and was promoted to credit officer in 2009.

Linda Kirrane has been named assistant vice president and regional branch manager. Kirrane has been with RBT since 2004, and was named branch manager in 2007. She currently manages its two Leominster offices.

Brigitte Grenier recently joined RBT as a credit officer. She has spent the last 13 years with IBM as a business operations manager and financial analyst, and has more than 25 years experience in similar positions with large corporations, the bank said.