Ron Farnsworth
Analyst · Raymond James
Okay. Thank you, Clint. We reported first quarter EPS of $0.59 and operating EPS of $0.65 per share, and our operating return on average tangible equity was 16%, while the operating PPNR was $201 million. Please refer to non-GAAP reconciliations provided at the end of our earnings release and presentation for details related to our calculation of operating metrics.
On the balance sheet, we had $200 million of loan growth and $100 million of deposit growth. For deposits, we had a decline in unsparing demand that occurred in January, but we're encouraged to see those balances flat for both February and March. Our net interest margin of 3.52% and was within our estimated range of 3.45% to 3.60%, and the expected reduction from the prior quarter was driven primarily by the deposit shifts that occurred in Q4 and January.
Our NIM increased to 3.55% in the month of March due to pricing reductions on wholesale and promotional fund. Our cost of inspiring deposits was 2.88% for the quarter. Within the quarter, this cost was 2.90% for both February and March, but ticked down to 2.89% at the very end of March. Our projected interest rate sensitivity under both ramp and shock scenarios remains in a liability-sensitive position, and we expect our rates down deposit betas to approximate those experienced on the way out.
Our provision for credit loss was $17 million for the quarter. We updated our commercial CECL models this quarter to better reflect historical and expected future losses. In 2023, the methodology for our combined company was structured to the historical Umpqua portfolio composition. The outcome was increased volatility in our provision expense that wasn't characteristic of the granularity and quality of our combined commercial portfolio. Our recalibrated commercial models, which now integrate additional data and operating knowledge, have effectively reduced our commercial allowance for credit losses.
It's important to note that the increase in our CRE and multifamily ACL is a response to the transient market conditions in Western downtown cores, where we maintain a minimal presence in our portfolio. Despite these adjustments, our overall allowance for credit loss remains robust, closing the quarter at 1.16% of total loans or 1.36% when including the remaining credit discount.
Total GAAP expenses for the quarter were $288 million, while operating expenses were $277 million. We've reflected the FDIC special assessment as a nonoperating item in the press release. Of note, we had a number of one-off items in the quarter that benefited our expense level. Absent these, [indiscernible] our normalized level of operating expense at $286 million.
As a reminder, on the expense front, we expect to record a restructuring charge of approximately $13 million related to the efficiency initiatives that Clint discussed as nonoperating expense in Q2. And with respect to our regulatory capital position, our risk-based capital ratio has increased as expected in Q1. We expect to build capital above all long-term targets, which will provide for enhanced future flexibility.
I'll close with our outlook for 2024 on several key financial statement items. These are consistent with those included in our early March investor presentation. Average earning assets are expected to remain in the $48 billion to $49 billion range. Our NIM is expected to remain in the 3.45% to 3.60% range, which includes stability in deposit balances.
For discount accretion, we continue to expect $130 million to $140 million of securities rate-related accretion, $90 million to $100 million of loan rate related accretion and $15 million to $20 million of loan credit related accretion.
We expect full year operating expense, including CDI amortization and the $975 million to $1.025 billion range. With the cost savings that Clint discussed earlier, we expect our Q4 operating expense, excluding CDI amortization to be in the $965 million to $985 million range on an annualized basis. We expect CDI amortization of $120 million for the year, with about $29 million in each of the remaining quarters of 2024. Merger-related expense of $10 million to $15 million and our effective income tax rate at 26.5%.
With that, I will now turn the call over to Frank.