"We have taken in profits much as possible from the government securities portfolio."
The bank also saw a flood of new deposits after Golden Key Credit Company, a member of Sri Lanka's Ceylinco group of companies collapsed, leading to a run on a number of group financial firms.
"The general public lost confidence after the Ceylinco debacle and we benefited from that," Hennanayake Bandara said.
In the 6-months to June NSB group capital gains on government securities was up 28 percent to 3.72 billion rupees to the from a year earlier.
"Our fund management company has performed exceptionally well," Hennanayake Bandara said.
NSB's fund management arm, a fully owned unit of the group made 240 million rupees, he said.
For the first six months NSB group interest income was up 22.5 percent to 20.7 bi