“I bow my head and apologize for causing the public concern as a result of these incidents,” Lee Myung-bak said in a short address on television.
His brother, Lee Sang-deuk, was detained by police on corruption charges earlier this month.
Lee Myung-bak’s five-year presidential term comes to an end in February 2013.
Lee Sang-deuk, a former lawmaker for six terms and reportedly the president’s political mentor, faces allegations of taking 600 million won ($525,000) in bribes from two savings banks to help them avoid an audit.
As the elder brother to South Korea’s head of state, his arrest and possible trial could affect support for the ruling party in December’s presidential elections.
There has been widespread anger over the savings bank scandal. Since the start of this year, South Korean regulators have closed 20 of the nation’s weakest banks.
Many of them were so-called savings banks, which were created following the 1997 Asian financial crisis. There used to be more than 100 of these small regional lenders, which were either private or rural co-operatives.
However, a rising number of mortgage defaults in the country’s lacklustre real-estate market following the 2008 financial crisis led many of these lenders to face capital and liquidity shortages.
In January 2011, the financial regulator began suspending operations of banks that did not have enough money.
Two of the troubled savings banks were Solomon Savings Bank, which was shut two months ago, and Mirae Savings Bank. Both allegedly made payments to the elder Lee Sang-deuk.
But prosecutors investigating the savings bank scandal allege the illegal activity goes much wider, and have indicted nearly 200 people, including politicians, lobbyists and bankers.
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