The lender's total branches will reach 546 by the end of 2012, it said in a statement posted on the Saudi bourse Website.
Al Rajhi Bank said last month its fourth-quarter net profit increased 3.2% to 1.47 billion Saudi riyals ($392 million), but this was short of most analysts' expectations.
The bank attributed the small rise in net profit to the diversification and growth of its investment and core banking revenue. It said its loan and investment book grew 6% on year in 2009.
Al Rajhi shares finished trading 0.34% lower Saturday at SAR74.00.