Terrance Dolan
Vice Chairman, Chief Financial Officer at U.S. Bancorp
Thanks, Andy. Turning to Slide eight, a key strength of the bank is our well-diversified deposit base, which remains a stable source of low-cost funding. As a reminder, following the completion of our acquisition of Union Bank last quarter, our end-of-period deposits totaled $525 billion, including approximately $80 billion of deposits from Union Bank. As we discussed last quarter, $9 billion of Union Bank acquired deposits were transitory in nature, with $4 billion returned to MUFG in the fourth quarter and an additional $4.7 billion that moved back to MUFG in the first quarter of this year.
In addition, $1.1 billion of acquired deposits were included in the branch sale or related to pure point, a broker deposit-gathering mechanism that we discontinued. Importantly, prior to the events of March 8th, we saw expected deposit outflow largely consistent with seasonal patterns, reflective of our business mix, including our large trust business.
From March 8th through the end of the quarter, deposit balances were relatively stable, down only 0.6% as inflows from new customers were slightly offset by the impact of clients diversifying their deposits and seeking yield in money market funds, consistent with broader industry trends. During this period, we saw an increase in money market funds of approximately $10 billion within our Wealth Management and Investment Services businesses. We expect the competition for deposits to remain high for the industry in 2023. Our cumulative deposit beta through the first quarter was approximately 34% and we expect that to increase to about 40% by the end of this rate cycle, generally in-line with our previous expectations.
Slide nine provides additional detail on the composition of our highly-diversified deposit base. As the slide shows, our deposit balances are composed of a broad mix of consumer, corporate and commercial customers that we support with an expansive, broad branch distribution network and mobile capabilities across our national footprint.
Our deposit base reflects the wide range of customers and industries that our companies serve. At March 31st, our percent of insured deposits to total deposits was 51%. Approximately 80% of our uninsured deposits are composed of operational wholesale trust and retail deposits that are stickier either because they are contractually bound or tied to treasury management services and trust activities provided to corporate and institutional clients, combined with our consumer base deposits, the stability of our funding sources sound.
Moving to Slide 10, US Banc's total available liquidity as of March 31st was $315 billion, representing 126% of our uninsured deposits. As of March -- as of December 31st, our liquidity coverage ratio was 122%. As mentioned, our strong debt ratings reflect our diversified business profile, well collateralized credit exposure, healthy capital and liquidity profiles and disciplined asset, liability management framework. These attributes work in concert with our strong balance sheet optimization and management practices to ensure strength and stability of our balance sheet.
Slide 11 provides details on the composition of our investment securities portfolio. Over the last five quarters and well-ahead of the most recent banking disruption, we reduced the size of our investment securities portfolio from 30% to 25% of total assets, while increasing cash levels. In preparation for and as part of the completion of our acquisition of Union Bank, we repositioned our balance sheet by selling fixed-rate loans and investment securities paid-off borrowings and increased cash balances in response to economic uncertainty, industry dynamics, rising interest rates and increased market volatility.
At March 31st, approximately 90% of the securities in our investment portfolio are back and are sponsored by the US federal government, with 55% of securities designated as held-to-maturity and 45% designated as available for sale. Further available for sale, unrealized losses as a percentage of our investment securities portfolio improved in the first quarter, in total, AOCI improved by 11% on a linked-quarter basis.
Turning to Slide 12, as a reminder, following the completion of our acquisition of Union Bank, our CET1 capital ratio declined from 9.7% at the end of the third quarter of 2022 to 8.4% as of December 31st, which reflected the impacts of balance sheet optimization and purchase accounting adjustments now will accrete back into capital over the next few years. Strategically, we continue to be encouraged about the financial merits of this deal and the synergistic benefits we expect to realize as a combined institution. As, Andy mentioned earlier, our CET1 capital ratio at March 31st was 8.5%, the 10 basis point increase from year end reflected 20 basis points of capital accretion, offset by the transitional impact of CCEL of 10 basis-points. As of March 31st, we expect to accrete approximately 20 to 25 basis points of capital per quarter, as we complete the Union Bank integration and realize cost synergies. Importantly, this does not include the impacts of planned RWA optimization initiatives mentioned earlier.
Turning to Slide 13, total end of period loans were $388 billion, which was flat on a linked-quarter basis and up 21.6% year-over-year. Commercial real-estate loans represent approximately 14% of our total loan portfolio, with CRE office exposure representing approximately 2% of total loans and only 1% of total commitments. Leverage lending balances are not a significant component of the loan portfolio.
Slide 14 shows credit quality trends, which continue to be strong, but as expected started to -- are starting to normalize across the portfolio. The ratio of non-performing assets to loans and other real-estate was 0.3% at March 31st, compared with 0.26% at December 31st and 0.25% a year ago. Our first quarter net charge-offs of 0.3% as adjusted increased 7 basis-points versus the fourth quarter level of 0.23% as adjusted and was higher when compared to the first-quarter of 2022, which was a level of 0.21%. Our allowance for credit losses as of March 31st totaled $7.5 billion or 1.94% of period-end loans. As the chart on the upper-right side of this slide demonstrates, our credit performance through the cycle serves as a key differentiator for the bank.
Slide 15 provides a detailed earnings summary for the quarter. In the first quarter, we earned $1.16 per diluted share excluding $0.12 of notable items related to the acquisition -- the recent acquisition of Union Bank. Slide 16 highlights revenue trends for the quarter. Net revenue totaled $7.2 billion in the first quarter, which included a full-quarter of revenue contribution from Union Bank of $832 million, primarily representing net interest income. Net interest income grew 7.9% on a linked-quarter basis and 45.9% year-over-year, driven by earning asset growth and continued net interest margin expansion, which benefited from rising interest rates.
Non-interest income as adjusted increased 2.7% compared to the fourth quarter, driven by higher commercial product revenue, mortgage banking revenue and trust and investment management fees, partially offset by losses of $32 million from securities sales.
Turning to Slide 17, adjusted non-interest expense for the company totaled $4.3 billion in the first quarter, including $546 million from Union Bank. Non-interest expense as adjusted increased 9.1% on a linked-quarter basis, largely driven by the impact of two additional months of Union Bank's operating expenses, core deposit intangible amortization and higher compensation and other non-interest expenses.
I will now provide second quarter and updated full-year 2023 forward-looking guidance on Slide 18. Starting with the second quarter of 2013 (sic) 2023 guidance. We expect average earning assets of between $600 billion and $605 billion in the second quarter and a net interest margin of approximately 3%. Total revenue as adjusted is estimated to be in the range of $7.1 billion to $7.3 billion, including approximately $85 million of purchase accounting accretion. Total non-interest expense as adjusted is expected to be in the range of $4.3 billion to $4.4 billion, inclusive of approximately $120 million, a core deposit intangible amortization related to Union Bank.
Our tax-rate is expected to be approximately 23% on a taxable equivalent basis. To date, we have incurred $573 million in merger and integration costs and anticipated charges of between and anticipate charges of between $250 billion and $300 million for the second quarter. We continue to estimate total merger and integration costs of approximately $1.4 billion, consistent with earlier guidance.
I will now provide updated guidance for the full-year. For 2023, average earning assets are now expected to be in the range of $600 billion to $610 billion. We expect the net interest margin to be between 3.0% to 3.05% for the full-year. Total revenue as adjusted is now expected to be in the range of $28.5 billion to $30.5 billion inclusive of approximately $350 million of full-year purchase accounting accretion. Total non-interest expense as adjusted for the year is expected to be in the range of $17.0 billion to $17.5 billion, inclusive of approximately $500 million of core deposit intangible amortization related to Union Bank. Our estimated full-year income tax-rate on a taxable equivalent basis is now expected to be approximately 23.0%. We continue to expect to have $900 million to $1 billion of merger and integration charges in 2023.
I will now hand it back to Andy for closing remarks.