Rockland Trust said that its Investment Management Group has reached $2 billion in assets under administration.

The group’s assets increased by nearly 21 percent from the fourth quarter of 2011 through the second quarter of 2012 and have doubled since 2006, said Rockland Trust, a full-service commercial bank headquartered in Massachusetts.

“This is a significant milestone that demonstrates that more and more clients are discovering how we can help them manage their money and prepare for the future,” Rockland Trust chief investment officer David B. Smith said in a statement.

Rockland Trust’s network is made up of 67 retail branches, 10 commercial lending centers, four investment management, and four residential lending centers that are located throughout Eastern Massachusetts and Rhode Island.