Thank you, Steve, and good afternoon. On today's call, I will provide an update on our operations in light of the ongoing COVID-19 pandemic that is impacting our nation and the world. I will then briefly review the highlights of our first quarter 2020 results, including an update on the integration of the West Texas State Bank or WTSB. Cory will discuss the steps we are taking to manage our loan portfolio and Steve will then conclude with a more detailed review of our first quarter 2020 financial results. We will then open the call for your questions, and we have City Bank's Chief Credit Officer, Brent Bates, here to help.
Over my nearly 50-year 10-year in banking, I have seen many tumultuous periods, each of which have their own unique challenges. Ultimately, it has been the experience and talent of our people, combined with a well-capitalized balance sheet, which has consistently positioned City Bank to not just weather the storm but thrive. And we believe this time of crisis is no different, and we expect City Bank will continue to drive through our dedication and support to our customers and communities. So without their success, ours would not be possible.
It is this philosophy and experience, which guides our company, and I would like to thank our employees for their hard work and dedication to ensure that our operations continue to run smoothly, and the services and support to our customers are uninterrupted during these difficult times.
I am very proud of our oversight committee for our business continuity and incident response here at the bank. They have been monitoring the spread of the coronavirus in the communities we serve for several weeks and have been continuously escalating our response as well as our employee and customer communications as the pandemic has expanded. As a result of their efforts, we've put in place a pandemic task force, which met daily for 2 weeks and now meets on an as-needed basis as state and local officials announce changes to procedures.
Our pandemic task force has implemented our business continuity plan to ensure the safety of our employees and customers, which remains our #1 priority. As part of our business continuity plan, we have enabled many of our employees to work from home, have restricted access to our bank lobbies to allowing customers in by appointment only, are providing essential banking services through our drive through windows and recently upgraded digital platforms and have repositioned our staff and our operations center to allow for social distancing.
We are very fortunate to have our City Bank operations center that opened in 2018. It is a cutting-edge facility that handles our digital banking, treasury management, loan and deposit operations and also houses our customer experience center. This facility is quite large, which has allowed us to effectively reposition our teams and provide more than adequate distancing. The facility also provides support for our employees who are working remotely. As a result, we have been able to provide our customers with seamless support and service while maintaining the safety and health of our employees. Our investments in our infrastructure and technology are just one example of the many changes that our senior management team has implemented over the last 6 years as we have been working aggressively to improve our operations in still a disciplined credit culture, diversify our funding and scale the bank. We have learned many important lessons from the Great Recession and have been positioning City Bank to weather the next downturn. As a result, we remain confident in our underwriting, risk management and capital policies and plans.
Turning to our financials. We reported net income of $7.1 million or $0.38 per diluted common share for the 2020 first quarter as compared to net income of $4.8 million or $0.32 per diluted common share in the first quarter of 2019. Our net interest margin increased modestly to 4.13% in the first quarter of 2020 as compared to 4.03% in the fourth quarter of 2019. Of note, our average cost of deposits declined 11 basis points to 65 basis points in the first quarter of 2020 as compared to 76 basis points in the fourth quarter of 2019. This improvement was largely driven by having a full quarter of WTSB's low-cost deposits. Our adjusted efficiency ratio for the first quarter of 2020 was 72.5%, which excludes the effect of a $2.3 million gain on sale of securities and compares to 81.8% in the first quarter of 2019. I am very pleased with the continued progress that we have achieved in scaling our infrastructure.
Lastly, as Cory and Steve will discuss in more detail shortly, we recorded a $6.2 million provision for loan loss in the first quarter of 2020, which compares to $896,000 for the fourth quarter of 2019. The increase was largely due to our decision to downgrade the risk ratings on some of the more at risk sectors in our portfolio, primarily energy and hospitality. Importantly, we are working proactively with our borrowers who are most impacted by the pandemic and by low oil prices to help them weather the storm. While we expect our provision expense to remain at elevated levels over the balance of the next few quarters, we remain well capitalized with a common equity Tier 1 to risk-weighted assets ratio of 11.24%. We also have sufficient liquidity on hand as well as $450 million in unpledged securities and access to lines of credit with the Federal Home Loan Bank of Dallas, the Federal Reserve Bank and other banks. Lastly, we remain confident in our underwriting and the overall soundness of our loan portfolio.
Turning to West Texas State Bank. We completed WTSB's data conversion at the end of the first quarter of 2020, and it went very smoothly. All of the preplanning that our team went through made a significant difference and I am pleased with how quickly we have been able to integrate WTSB's operations into ours. Today, we are operating those 6 branches in 5 West Texas communities, all under the City Bank brand. We have also brought in a new regional head for our Permian Basin operations, who has significant end market experience in both driving organic growth as well as managing through challenging credit environments like we're facing today with the sharp drop in energy prices.
In our many years of banking around this region, we have seen numerous cycles in the oil business. This one began very suddenly, and it's certainly exacerbated by the effects of the coronavirus pandemic. However, like all the ones before it, we believe, it too will pass.
Outside of the Permian, our local Texas economies are broadly performing. And other than a few select industries, we are not seeing major employers lay off their workers at this time. Of course, the current environment is uncertain, and we are closely monitoring all available economic data. Given this uncertainty, we have suspended our share repurchase program and will continue to prudently evaluate our quarterly dividend with our Board of Directors each quarter.
Now let me turn the call to Cory.