the Company’s common stock during the nine months ended September 30, 2024 totaling $12.5 million and dividends declared on common stock during that period of $14.0 million.
The Company also had unrealized losses on its portfolio of held-to-maturity investment securities, which totaled $19.2 million at September 30, 2024, that were not included in its total capital balance. If these held-to-maturity unrealized losses were included in capital (net of taxes), they would have decreased total stockholder’s equity by $14.6 million at September 30, 2024. This amount was equal to 2.4% of total stockholders’ equity of $612.1 million at September 30, 2024.
Banks are required to maintain minimum risk-based capital ratios. These ratios compare capital, as defined by the risk-based regulations, to assets adjusted for their relative risk as defined by the regulations. Under current guidelines, which became effective January 1, 2015, banks must have a minimum common equity Tier 1 capital ratio of 4.50%, a minimum Tier 1 risk-based capital ratio of 6.00%, a minimum total risk-based capital ratio of 8.00%, and a minimum Tier 1 leverage ratio of 4.00%. To be considered “well capitalized,” banks must have a minimum common equity Tier 1 capital ratio of 6.50%, a minimum Tier 1 risk-based capital ratio of 8.00%, a minimum total risk-based capital ratio of 10.00%, and a minimum Tier 1 leverage ratio of 5.00%. On September 30, 2024, the Bank’s common equity Tier 1 capital ratio was 12.9%, its Tier 1 risk-based capital ratio was 12.9%, its total risk-based capital ratio was 14.2% and its Tier 1 leverage ratio was 11.2%. As a result, as of September 30, 2024, the Bank was well capitalized, with capital ratios in excess of those required to qualify as such. On December 31, 2023, the Bank’s common equity Tier 1 capital ratio was 13.1%, its Tier 1 risk-based capital ratio was 13.1%, its total risk-based capital ratio was 14.3% and its Tier 1 leverage ratio was 11.6%. As a result, as of December 31, 2023, the Bank was well capitalized, with capital ratios in excess of those required to qualify as such.
The FRB has established capital regulations for bank holding companies that generally parallel the capital regulations for banks. On September 30, 2024, the Company’s common equity Tier 1 capital ratio was 12.3%, its Tier 1 risk-based capital ratio was 12.8%, its total risk-based capital ratio was 15.5% and its Tier 1 leverage ratio was 11.0%. On December 31, 2023, the Company’s common equity Tier 1 capital ratio was 11.9%, its Tier 1 risk-based capital ratio was 12.4%, its total risk-based capital ratio was 15.2% and its Tier 1 leverage ratio was 11.0%.
In addition to the minimum common equity Tier 1 capital ratio, Tier 1 risk-based capital ratio and total risk-based capital ratio, the Company and the Bank have to maintain a capital conservation buffer consisting of additional common equity Tier 1 capital greater than 2.5% of risk-weighted assets above the required minimum levels in order to avoid limitations on paying dividends, repurchasing shares, and paying discretionary bonuses. At September 30, 2024 and December 31, 2023, both the Company and the Bank had a capital conservation buffer that exceeded the required minimum levels.
Dividends. During the three months ended September 30, 2024, the Company declared a common stock cash dividend of $0.40 per share, or 28% of net income per diluted common share for that three month period, and paid a common stock cash dividend of $0.40 per share (which was declared in June 2024). During the three months ended September 30, 2023, the Company declared a common stock cash dividend of $0.40 per share, or 30% of net income per diluted common share for that three month period, and paid a common stock cash dividend of $0.40 per share (which was declared in June 2023). During the nine months ended September 30, 2024, the Company declared common stock cash dividends totaling $1.20 per share, or 30% of net income per diluted common share for that nine month period, and paid common stock cash dividends of $1.20 per share. During the nine months ended September 30, 2023, the Company declared common stock cash dividends totaling $1.20 per share, or 27% of net income per diluted common share for that nine month period, and paid common stock cash dividends of $1.20 per share. The Board of Directors meets regularly to consider the level and timing of dividend payments. The $0.40 per share dividend declared but unpaid as of September 30, 2024, was paid to stockholders in October 2024.
Common Stock Repurchases and Issuances. The Company has been in various buy-back programs since May 1990. During the three months ended September 30, 2024, the Company repurchased 2,971 shares of its common stock at an average price of $53.04 per share and issued 101,333 shares of common stock at an average price of $50.07 per share to cover stock option exercises. During the three months ended September 30, 2023, the Company repurchased 106,801 shares of its common stock at an average price of $50.52 per share and issued 1,640 shares of common stock at an average price of $33.71 per share to cover stock option exercises. During the nine months ended September 30, 2024, the Company repurchased 239,933 shares of its common stock at an average price of $51.69 per share and issued 116,471 shares of common stock at an average price of $48.39 per share to cover stock option exercises. During the nine months ended September 30, 2023, the Company repurchased 376,122 shares of its common stock at an average price of $51.97 per share and issued 9,195 shares of common stock at an average price of $33.78 per share to cover stock option exercises.
In December 2022, the Company’s Board of Directors authorized the purchase of up to one million shares of the Company’s outstanding common stock, under a program of open market purchases or privately negotiated transactions. At September 30, 2024, approximately 488,000 shares remained available in our stock repurchase authorization.