Bank of America Corp., the No. 2 U.S. bank by assets, reported its biggest quarterly profit in nearly four years on Wednesday as mortgage banking revenue soared and expenses fell to their lowest since the financial crisis.

BofA’s legal expenses, which have totaled at least $70 billion since 2008, dropped for the second straight quarter, suggesting the worst of the bank’s legal problems stemming from the financial crisis was behind it.

Net income attributable to Bank of America’s shareholders more than doubled to $4.99 billion, or 45 cents per share, in the second quarter ended June 30 from $2.04 billion, or 19 cents per share, a year earlier.

Analysts on average had expected earnings of 36 cents per share, according to Thomson Reuters I/B/E/S. However, it was not clear if the reported figures were comparable.

Litigation expenses, which had undermined the cost-cutting initiatives introduced by Chief Executive Brian Moynihan since he assumed the top job in 2010, fell to $175 million from $4 billion a year earlier.

“We also benefited from the improvement in the U.S. economy, where we are particularly well positioned,” Moynihan said.

BofA’s shares were up about 3 percent at $17.63 in morning trading on the New York Stock Exchange.

The bank’s non-interest expenses fell 25.5 percent to $13.82 billion in the quarter, while net interest income rose 4.7 percent to $10.49 billion. Overall revenue, excluding adjustments, rose 1.7 percent to $22.12 billion.