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Operator
Good day, everyone, and welcome to the RBB Bancorp Earnings Conference Call for the Fourth Quarter and Full Year 2021. (Operator Instructions) Please note, this call may be recorded. (Operator Instructions)
I would now like to turn the conference over to Catherine Wei.
Catherine Wei;Investor Relations
Thank you. Good day, everyone, and thank you for joining us to discuss RBB Bancorp's financial results for the fourth quarter of 2021. With me today from management are President and CEO, Alan Thian; EVP and Chief Financial Officer, David Morris; EVP and Chief Credit Officer, Jeffrey Yeh; and EVP and Chief Risk Officer, Vincent Liu. Management will provide a brief summary of the results, which can be found in the earnings press release that is available on our Investor Relations website, and then we'll open up the call to your questions.
During this conference call, statements made by management may include forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. Such forward-looking statements are based upon specific assumptions that may or may not prove correct. Forward-looking statements are also subject to known and unknown risks and uncertainties and other factors relating to RBB Bancorp's operations and business environment, all of which are difficult to predict and many of which are beyond the control of the company.
For a detailed discussion of these risks and uncertainties, please refer to the documents the company has filed with the SEC. If any of these uncertainties materialize or any of these assumptions prove incorrect, RBB Bancorp's results could differ materially from its expectations as set forth in these statements. The company assumes no obligation to update such forward-looking statements unless required by law.
Now I'd like to turn the call over to Alan Thian. Alan?
Yee Phong Thian - President, CEO & Director
Thank you, Catherine. Good day, everyone, and thank you for joining us today. Royal Business Bank's excellent fourth quarter results contributed to a record year of growth and performance in 2021. Our expansion strategy has proven to be an effective driver of earnings, loan growth, improvements in our deposit franchise and most importantly, shareholder value. Our nationwide footprint gives us the ability to focus our loan and deposit origination efforts in regions with high economic growth.
Our focus on serving the financial needs of underbanked first-generation immigrant Americans gives us access to deposits and loans that have long been ignored by conventional commercial banks. And our long history of underwriting and monitoring these differentiated assets give us the confidence that we are appropriately pricing risk and addressing issues as they arise.
Our recent expansion into the Hawaiian market and our announced acquisition of Gateway Bank in the San Francisco Bay Area will provide us with additional opportunities to bring our unique model to new markets. We now have a physical presence in 6 of our 9 target markets and expect to have additional expansion opportunities to discuss in the near future.
While we are pleased with our record financial results, we are also proud to have been recognized for our service to the communities in which we serve and operate. Last year, both Simon Pang, our EVP and Chief Strategy Officer, and I were appointed to national commissions to advise on community developments, and we were awarded a $1.8 million CDFI grant by the U.S. Treasury. We believe these appointments and the grant are a testament to the work we do in the communities we serve.
With that, I will turn the call over to David to discuss some of the quarter's financial highlights before opening up the call for questions. David?
David Richard Morris - Executive VP & CFO
Thank you, Alan. I'll start by reviewing some of the highlights of our income statement before moving on to our balance sheet.
Net income grew 2.2% from last quarter and 40.9% from a year earlier to a record $15.9 million or $0.79 per diluted share in the fourth quarter. Net income benefited from several factors. A $135.9 million increase in average earning assets and a stable yield drove a $1.6 million increase in net interest income from the prior quarter. Net interest income also benefited from a decline in interest expense due to a decline in average interest-bearing liabilities and a modest decline in deposit cost.
Fourth quarter noninterest income decreased by $2.4 million from the previous quarter, primarily due to last quarter's CDFI grant and some unrealized losses on equity investments and derivatives this quarter. Noninterest expense decreased from last quarter as a $2 million decrease in compensation expense was offset by a $940,000 increase in legal and professional expenses. The decrease in compensation expense was due in part to an increase in the percentage of compensation paid in restricted stock units that will vest over time. The increase in legal and professional expenses were due in part to expenses related to the acquisition of the branch in Honolulu and the announced acquisition of Gateway Bank and the revision of the compensation plan.
Net interest margin was 3.43% for the fourth quarter, an increase of 5 basis points from the third quarter and a decrease of 24 basis points from a prior year. Annualized return on average assets and return on tangible common equity were relatively stable in the fourth quarter at 1.52% and 15.98%, following the impact of the CDFI grant in the third quarter.
Net loans held for investment totaled $2.9 billion as of December 31, which was a $90.3 million increase from last quarter. We had good growth in all our products except C&I, which decreased by $8 million from the prior quarter and then SBA, which decreased by $12.6 million. Our non-QM mortgage product, which is our most profitable mortgage product, continues to lag due to the rate environment.
Our yield on average earning assets for the quarter was stable from the last quarter at 3.97% and down 58 basis points from the prior year. As with the NIM, this year-over-year decrease was almost entirely due to lower returns on excess capital.
With respect to funding, commercial customer activity drove $175 million of growth in average noninterest-bearing deposits over the quarter. Year-end commercial activity drove an increase in deposits at December 31, which have remained elevated but could decline somewhat if rates increased. Our average cost of interest-bearing deposits for the quarter was 0.47%, which was down 4 basis points from the prior quarter and 46 basis points from the fourth quarter of 2020.
Nonperforming assets increased by $6.5 million to $21 million in the fourth quarter, increasing 12 basis points to 0.5% of total assets. We anticipate this increase will be temporary and will return to previous levels by the end of the second quarter. As of January 15, we had no loans in COVID-19 deferments. We took a provision for credit losses of $635,000 in the fourth quarter, primarily attributable to loan growth. Our capital levels remain strong with our capital ratios well above regulatory minimums.
With that, we are happy to take your questions. Operator, please open up the call.
Operator
(Operator Instructions) And we will take our first question from Nick Cucharale with Piper Sandler.
Nicholas Anthony Cucharale - Director & Senior Research Analyst
I'd like to start with the exceptional deposit growth this quarter. So you noted the expanding relationships with a number of your commercial clients. But can you give us some more detail on this? Are there any concentrations in this quarter's growth that we should be aware of?
David Richard Morris - Executive VP & CFO
Yes. There is. We have a couple of big clients who have come on board. Let's just say come on board. We had one client that took some money out at the end of the third quarter and has put the money back in. And we have had growth in another client, significant growth in another client also, okay?
Nicholas Anthony Cucharale - Director & Senior Research Analyst
Are we talking about like a majority of this quarter's growth coming from 1 or 2 clients? I'd just like to kind of decipher that a little bit.
David Richard Morris - Executive VP & CFO
I would say that the majority of the growth is coming from a few clients, but then also we had some good growth in our franchise. Okay.
Nicholas Anthony Cucharale - Director & Senior Research Analyst
Okay. Just from an overarching perspective, are you expecting noninterest-bearing deposits to increase as a percentage of total deposits from this level?
David Richard Morris - Executive VP & CFO
No. We actually anticipate as the COVID, all the COVID money goes away and as interest rates go up, we expect $300 million to $500 million of noninterest-bearing deposits to either run off the bank, run out of the bank or go into higher instruments.
Nicholas Anthony Cucharale - Director & Senior Research Analyst
Okay. And then related to that, just to stay on the topic, you've driven your cost of funds down significantly due to both rate and mix. Now does this significant change in the funding base change the strategy at all?
David Richard Morris - Executive VP & CFO
I don't think.
Yee Phong Thian - President, CEO & Director
We don't think so. It was just that the interest rate environment had been so low for these past years that we just continue to drive our interest rate lower. Again, I would say that one of the reason is because during the pandemic in these past 2 years, what we found in common was that it could be a lot of depositors they're afraid to come to the bank. And a lot of the renewal of the interest rate, they were not that keen in bargaining on the rate a little bit. So we see very little bargaining or negotiation of the rates from our existing customer in the last 2 years or because the rate environment is so low that it doesn't make sense for them to come in and close the CD, close the account and move to the next bank just for 1, 2 or 5 basis point. So I believe that helps a lot, too. Because in the last 2 years, we find that actually it's very easy for us to deal with our customer because I rarely see people come and negotiate rate with us.
However, just like David mentioned, when rate get to that low, a customer may not, he wouldn't want to negotiate 1 or 2 or 5 basis point. But however, it really depends on if this year if interest rates really move up 4 times. And if every time it's 25 basis point, the story could be different. So that is still something that we'll wait to see.
However, there are some bank in our communities is already promoting 68 basis point for a year and 88 basis point for 1.5 years so. But again, we are not going to follow that. But however, some smaller bank is already trying to lock in, trying to offer higher rate to lock in the money.
Nicholas Anthony Cucharale - Director & Senior Research Analyst
That's very helpful, Alan. And just my last question, just on loan growth. Can you update us on your organic targets for 2022 and just how the pipeline compares to this time last quarter?
Yee Phong Thian - President, CEO & Director
Yes. Again, our loan growth is still between, I would say that it's still between 8% to 10%, again, pending on how fast would be the interest rate increase. Because when the interest rate, because we grow a lot on the commercial side, so if interest rate move up fast and I see that maybe we may see loan maybe grow instead of 10%, we see 7% or 8%. One of the reason has been that when interest rate move up 50 basis point or 75 basis point, that will impact the debt coverage ratio. And then again because of the stress test, we're going to raise our interest rate on stressed assets as well.
So I anticipate that some of the loans that previously would qualify because of lower interest rate will not qualify in the future. So that may either, we have to reduce the loan amount or maybe they would, if this is a purchase, they may not qualify at all. So there's still, it will be a lot of moving parts. But however, I believe we are still looking at, on the conservative side, we are still looking at 7% to 8% growth.
Operator
And we will take our next question from Andrew Terrell with Stephens Inc.
Robert Andrew Terrell - Analyst
I just want to circle back to the noninterest-bearing deposit increase we saw this quarter. And just to clarify, do you expect some of the increase this quarter to be transitory and potentially run off in the next couple of quarters? And if so, can you just quantify that amount?
David Richard Morris - Executive VP & CFO
Yes. We do expect that it's transitory. We expect that, we were talking about $175 million in average balances. We expect close to half of what came on over the quarter to probably go off in the next 6 months.
Robert Andrew Terrell - Analyst
Okay. And is that incremental to the, I think you referenced $300 million to $500 million of noninterest-bearing that you expect to either run off on PPP?
David Richard Morris - Executive VP & CFO
Yes. That's part of that. That's part of it.
Robert Andrew Terrell - Analyst
Okay. Got it. Looking at the kind of mortgage gain on sale margin, it looks like it ticked up a little bit this quarter. I guess should we expect the gain on sale margin for mortgage to kind of step down a little bit from here given the outlook on interest rates? And then can you just provide an updated expectation on mortgage production or sold volume for both the QM and non-QM business as we head into 2022?
David Richard Morris - Executive VP & CFO
Okay. The volume for non-QM business right now is 0 for mortgage sales. For Fannie Mae, we're still hoping that we can meet our $8 million to $10 million mark, which will give us our gain on sale that we would need to have that we've talked about in the past.
Okay. As far as what we earn on our Fannie Mae loans right now, in August, we went to mandatory delivery, and we began hedging all of our mortgages that it ended up being a good play for us because we've ended up earning about a full point more than what we were earning prior. Having said that, right now, servicing as part of the gain is right now at an all-time high. And as rates go up, that will go down, okay? So as rates go up, we would expect the amount that we earn on our mortgage sales go down maybe 50 basis points, depends on how quickly and how high they go.
Yee Phong Thian - President, CEO & Director
Yes.
Robert Andrew Terrell - Analyst
Okay. And then just on the expense base, it was nice to see kind of the quarter-on-quarter decline this quarter if you adjust for some of the merger. Can you maybe help us think about, I guess the kind of full year '22 gets a little bit lumpy with kind of some of the cost saves and added deal expenses. But can you help us think about kind of run rate for expenses heading into the first quarter?
David Richard Morris - Executive VP & CFO
I think our expenses are going to be very close, if not a little bit higher than our third quarter of 2021. It's going to probably be higher than that because our salaries, most of the demand on our employees or the demand for our employees, I should say, is extremely high. And I think even our average performers are probably getting close to 5% and our better performers are getting up to 10%.
Yee Phong Thian - President, CEO & Director
10%.
David Richard Morris - Executive VP & CFO
10%. Okay. And that's only because we see that we need to retain our staff. Okay?
Robert Andrew Terrell - Analyst
Okay. Very helpful. Congrats on a good quarter.
Operator
(Operator Instructions) And we will take our next question from Kelly Motta with KBW.
Kelly Ann Motta - Associate
Most of mine have been asked and answered already. But maybe since we have the time, you could give us an update on the M&A environment. I know you have the deal pending. You just closed the Hawaii branch acquisition. Does this kind of keep you out for the next year or so or do you still have the capacity and desire to continue to look for acquisitions?
Yee Phong Thian - President, CEO & Director
Well, I would say that our strategy all along is to grow both organically and through M&A. So our strategy on organic growth is pretty much like 8% on loans, 11% to 12% on deposits.
The M&A side, it really depends on at certain point or at any point, is there a bank of our interest becomes available. So knowing that we are looking at a specific market, an area where the financial institution is serving the first-generation immigrants or possible other unserved or underserved market. So that is just a different market segment we are getting into.
So there are a few institutions we always have our eye on such as an area like Seattle, such an area like Texas and an area like some of the metropolitan city like Phoenix, Miami, Atlanta. Those are still the targets that we are looking at. So again, it's really whether we can pick up a particular institution is really to see whether we have any of this institution that we're looking at become available.
Operator
And we have a follow-up question from Andrew Terrell with Stephens Inc.
Robert Andrew Terrell - Analyst
I did want to ask one quick one just on the buyback. I saw you purchased some shares, I think 75,000 shares back during the quarter. Obviously, we've seen an improvement in price from there and you've got a pending acquisition now. Just wanted to get kind of updated thoughts on appetite as it pertains to the buyback moving forward.
David Richard Morris - Executive VP & CFO
Okay. So right now we're over our, I guess, target price for the buyback. So there probably won't be any buyback for as long as we're still at a $29 price that we are right now. There won't be. But if the price does go back down, it's already preset, so it will kick in at that level, okay?
We still have 333,000 shares, I believe, close to that, that we can do. And our problem is the volume. There's days when we're in the market, we're buying less than 1,000 shares.
Operator
And we have no further questions on the line at this time. I will turn the program back over to our presenters for any additional or closing remarks.
Yee Phong Thian - President, CEO & Director
Once again, thank you all for joining us today. We look forward to speaking to many of you in the coming days and weeks. Have a nice day.
Operator
This does conclude today's program. Thank you for your participation. You may disconnect at this time and have a wonderful day.