On March 9, 2023, Silvergate Bank, La Jolla, California, announced its decision to voluntarily liquidate its assets and wind down operations. On March 10, 2023, Silicon Valley Bank, Santa Clara, California, was closed by the DFPI on March 12, 2023, Signature Bank, New York, New York, was closed by the New York State Department of Financial Services and on May 1, 2023, First Republic Bank, San Francisco, California, was closed by the DFPI, and in each case the FDIC was appointed receiver for the failed institution. These banks had elevated levels of uninsured deposits, which may be less likely to remain at the bank over time and less stable as a source of funding than insured deposits. These failures led to volatility and declines in the market for bank stocks and questions about depositor confidence in depository institutions.
These events have led to a greater focus by institutions, investors and regulators on the on-balance sheet liquidity of and funding sources for financial institutions, the composition of their deposits, including the amount of uninsured deposits, the amount of accumulated other comprehensive loss, capital levels and interest rate risk management.
If we are unable to adequately manage our liquidity, deposits, capital levels and interest rate risk, we may experience a material adverse effect on our financial condition and results of operations. We must maintain sufficient funds to respond to the needs of depositors and borrowers. Deposits have traditionally been our primary source of funds for use in lending and investment activities. We also receive funds from loan repayments, investment maturities and income on other interest-earning assets. While we emphasize the generation of low-cost core deposits as a source of funding, there is strong competition for such deposits in our market area. Additionally, deposit balances can decrease if customers perceive alternative investments as providing a better risk/return tradeoff. Accordingly, as a part of our liquidity management, we must use a number of funding sources in addition to deposits and repayments and maturities of loans and investments. We also rely on alternative funding sources including unsecured borrowing lines with correspondent banks, secured borrowing lines with the Federal Home Loan Bank of San Francisco and the Federal Reserve Bank of San Francisco, and public time certificates of deposits. Our ability to access these sources could be impaired by deterioration in our financial condition as well as factors that are not specific to us, such as a disruption in the financial markets or negative views and expectations for the financial services industry or serious dislocation in the general credit markets. Adverse operating results or changes in industry conditions could lead to difficulty or an inability to access these additional funding sources.
Any decline in available funding could adversely impact our ability to originate loans, invest in securities, pay our expenses, or fulfill obligations such as repaying our borrowings or meeting deposit withdrawal demands, any of which could have a material adverse impact on our liquidity, business, financial condition and results of operations.
A lack of liquidity could also attract increased regulatory scrutiny and potential restraints imposed on us by regulators. Depending on the capitalization status and regulatory treatment of depository institutions, including whether an institution is subject to a supervisory prompt corrective action directive, certain additional regulatory restrictions and prohibitions may apply, including restrictions on growth, restrictions on interest rates paid on deposits, restrictions or prohibitions on payment of dividends and restrictions on the acceptance of brokered deposits.
Our financial flexibility would be severely constrained if we were unable to maintain our access to funding or if adequate financing were not available at acceptable interest rates. Further, if we were required to rely more heavily on more expensive funding sources to support liquidity, our revenues may not increase proportionately to cover our increased costs. In this case, our operating margins and profitability would be adversely affected. If alternative funding sources were no longer available to us, we may need to sell a portion of our investment or loan portfolio to raise funds, which, depending upon market conditions, could result in us realizing a loss on the sale of such assets. As of December 31, 2024, we had a net unrealized loss of $59,221,000 on our available for-sale investment securities portfolio as a result of the rising interest rate environment. Our investment securities totaled $785,058,000, or 22.3% of total assets, at December 31, 2024. The details of this portfolio are included in Note 3 to the consolidated financial statements.