Bank of America adjusted earnings topped expectations in the first quarter, but one part of the company’s financial results worsened: the big paper losses on a key portion of its enormous bond portfolio. Bank of America shares, however, were down 2.3% to $35.03 in early trading Tuesday. The bank said that its unrealized losses on a $587 billion portfolio of bonds that are classified as held to maturity for accounting purposes widened by $11 billion to $109 billion on March 31 from $98 billion at year-end 2023.