The Company's total risk-based capital ratio at March 31, 2011, was 24.5%, significantly exceeding the required minimum of 10% to be considered a well-capitalized institution. This reflected, in part, the Company's second-step conversion and offering that was completed in November 2010, raising net proceeds of $61.4 million. The ratio of tangible common equity to total tangible assets was 12.3% as of March 31, 2011.
Net interest income for the first quarter increased 37% to $6.0 million from $4.4 million in the year-earlier quarter, primarily reflecting an increase in interest-earning assets related to both acquisitions and organic in-market growth. The Company's net interest margin for the first quarter of 2011 declined 46 basis points to 3.42% on a linked-quarter basis from 3.88% in the fourth quarter of 2010 and 26 basis points from 3.68% in the year-earlier period, reflecting excess liquidity related to the Company's capital raise in the fourth quarter of 2010, as that capital is currently deployed in lower-yielding investments.
Total nonperforming loans, excluding loans acquired in FDIC-assisted acquisitions, were $11.1 million at March 31, 2011, up from $9.9 million at December 31, 2010. OREO and repossessed assets, excluding assets acquired in FDIC-assisted acquisitions, were $3.2 million at March 31, 2011, down from $3.7 million at December 31, 2010. Nonperforming loans to total loans, excluding loans acquired in FDIC-assisted acquisitions, increased during the first quarter versus the fourth quarter of 2010, up to 2.74% as of March 31, 2011, versus 2.50% as of December 31, 2010. Net charge-offs to average outstanding loans, excluding loans acquired in FDIC-assisted acquisitions, on an annualized basis, were 2.80% for the first quarter of 2011 versus 1.84% for the fourth quarter of 2010 and 0.62% in the year-earlier period. Management believes that nonperforming assets and net charge-offs will likely remain at elevated levels, at least in the near term, because of the continued weakness in the local economy.