The bank is planning to cover the north and east areas in the next two years.
It also wants to triple account holders to one million from the current 300,000 during the period, Nimal Mamaduwa, general manager SDB told reporters.
SDB's deposits reached 4.8 billion in July from 4.4 billion since the end of 2006.
Bank's total assets were over seven billion rupees by July this year while loan portfolio increased to 5.3 billion, Mamaduwa said.
Micro finance bear a risk in lending to low income families but the non performing advance ratio for the bank dropped to 4.3 percent last year from 6.1 in 2005.
"Due to prudent credit management policies, we have been able to maintain it at this level," Mamaduwa said.
The bank conducts social auditing which investigates how families utilize the