Butterfield Private Bank is offering investment management to charities for the first time following its acquisition of Leopold Joseph.
The two firms have announced that they have successfully integrated.
They are now trading under the name of Butterfield Private Bank. The new services, which will include investment advice, will build on to the banks' existing services to charities.
Managing director Paul Turtle said: "The private banking market is ever-changing and we believe the acquisition of Leopold Joseph will enhance our presence in the private banking market and give us a strong position.
"We are committed to a high level of personal service for clients and believe this to be an important differentiator in an increasingly commoditised market."
The bank offers current, deposit, and money market accounts in addition to lending facilities and off-shore services.