According to the full-year results for the year ending 31 December Arbuthnot Latham increased profits from £11m to £14.6m.
However, assets under management fell 6%, from £1,044m to £985m.
Overall Arbuthnot Banking Group announced an increase in profit before tax of 172%.
Sir Henry Angest, chairman and chief Executive of Arbuthnot, said: “The group has had another good year with further deployment of capital.
“Diversity of earnings increased with good progress being made by the commercial bank, along with the launch of our new ventures, asset-based lending, Arbuthnot Direct and specialist finance.
“These new businesses should give the group a strong basis from which to develop in the future.”