investment securities that were transferred to the held-to-maturity category. Approximately $227 million of investment securities previously included in available-for-sale were transferred to held-to-maturity during the first quarter of 2022.
In addition, included in stockholders’ equity at June 30, 2023, were realized gains (net of taxes) on the Company’s terminated cash flow hedge (interest rate swap), totaling $14.2 million. This amount, plus associated deferred taxes, is expected to be accreted to interest income over the remaining term of the original interest rate swap contract, which was to end in October 2025. At June 30, 2023, the remaining pre-tax amount to be recorded in interest income was $18.5 million. The net effect on total stockholders’ equity over time will be no impact, as the reduction of this realized gain will be offset by an increase in retained earnings (as the interest income flows through pre-tax income).
Also included in stockholders’ equity at June 30, 2023, was an unrealized loss (net of taxes) on the Company’s outstanding cash flow hedges (interest rate swaps) totaling $23.4 million. Increases in market interest rates since the inception of these hedges have caused their fair values to decrease.
As noted above, total stockholders’ equity increased $13.2 million, from $533.1 million at December 31, 2022 to $546.3 million at June 30, 2023. Stockholders’ equity increased due to net income of $38.8 million in the six months ended June 30, 2023 and a $1.1 million increase in stockholders’ equity due to stock option exercises. Partially offsetting these increases were repurchases of the Company’s common stock totaling $14.3 million and dividends declared on common stock of $9.6 million. Accumulated other comprehensive income decreased $2.7 million during the six months ended June 30, 2023, primarily due changes in the fair value of cash flow hedges.
The Company also had unrealized losses on its portfolio of held-to-maturity investment securities, which totaled $24.7 million at June 30, 2023, that were not included in its total capital balance. If these held-to-maturity unrealized losses were included in capital (net of taxes) it would have decreased total stockholder’s equity by $18.6 million at June 30, 2023. This amount was equal to 3.4% of total stockholders’ equity of $546.3 million.
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 June 30, 2023, the Bank’s Tier 1 Leverage Ratio was 11.7%, Common Equity Tier 1 Capital Ratio was 12.7%, Tier 1 Capital Ratio was 12.7%, and Total Capital Ratio was 14.0%. As a result, as of June 30, 2023, the Bank was well capitalized, with capital ratios in excess of those required to qualify as such. On December 31, 2022, the Bank’s common equity Tier 1 capital ratio was 11.9%, its Tier 1 risk-based capital ratio was 11.9%, its total risk-based capital ratio was 13.1% and its Tier 1 leverage ratio was 11.5%. As a result, as of December 31, 2022, 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 June 30, 2023, the Company’s Tier 1 Leverage Ratio was 10.8%, Common Equity Tier 1 Capital Ratio was 11.4%, Tier 1 Capital Ratio was 11.8%, and Total Capital Ratio was 14.5%. To be considered well capitalized, a bank holding company must have a Tier 1 risk-based capital ratio of at least 6.00% and a total risk-based capital ratio of at least 10.00%. As of June 30, 2023, the Company was considered well capitalized, with capital ratios in excess of those required to qualify as such. On December 31, 2022, the Company’s common equity Tier 1 capital ratio was 10.6%, its Tier 1 risk-based capital ratio was 11.0%, its total risk-based capital ratio was 13.5% and its Tier 1 leverage ratio was 10.6%. As of December 31, 2022, the Company was considered well capitalized, with capital ratios in excess of those required to qualify as such.
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 June 30, 2023, the Company and the Bank both had additional common equity Tier 1 capital in excess of the buffer amount.
Dividends. During the three months ended June 30, 2023, the Company declared a common stock cash dividend of $0.40 per share, or 26% 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 March 2023). During the three months ended June 30, 2022, 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 $0.36 per share (which was declared in March 2022). During the six months ended June 30, 2023, the Company