Southside Got the Rate Hike It Asked For — and Its Bond Book Sent the Bill
A 12bp NIM snapback lifted EPS to $0.93, but AFS unrealized losses quintupled, AOCI deepened to -$149.8M, and loan growth guidance got trimmed
SBSI · Earnings Call · 2026-10-29
The rate hike Southside was waiting for
In July, pressed on whether margin pressure would persist absent of any rate hikes, Keith Donahoe conceded that was “a fair way to look at it right now.” — Jordan Ghent, Analyst · 2026-07-24 Three months and one September Fed move later, the answer flipped. Third-quarter tax-equivalent NIM came in at 3.02%, up 12 basis points linked quarter, on a $3.0 million (5.2%) increase in net interest income. Diluted EPS of $0.93, a 1.27% return on average assets, and a 31% return on average tangible common equity — for a roughly $1 billion market-cap Texas bank that trades near 1.2x book.
The mechanism is the deliberate multi-year rebuild of the balance sheet toward floating-rate assets. Only two weeks of the September hike landed in Q3, and roughly 55% of the loan book reprices inside 90 days. “The last time rates rose, we were not in a position to reprice our book loan book as fast as we are able to reprice our loan book today.” — Keith Donahoe, President and CEO · 2026-10-29 That is the asymmetry the whole thesis rests on: loan betas near 100%, deposit betas around 35% on CDs and a modeled 39% on non-maturity deposits. The rate hike theme is genuinely new to this company's narrative — a year ago the outgoing CEO was telling analysts to expect cuts, and in July Keith was flagging 62% of loans floating as an insurance policy against exactly this outcome.
The bill arrives in the securities book
The cost of that positioning showed up in the same quarter, just on a different line. The AFS unrealized loss ballooned from $9.8 million to $93.3 million, and AOCI deepened from -$92.1 million to -$149.8 million. Duration on the AFS portfolio jumped from 4.3 to 5.9 years, and total securities duration from 7.2 to 7.8 years — because, as Suni Davis put it,
That had more to do with the rising rate environment. Stretching out the duration than intentional movement by us.
In plain terms: higher rates are accretive to earnings and dilutive to tangible capital at the same time. Management flagged AOCI impacts in its own keyword set this quarter, and an analyst pressed directly on whether the TCE drag changes the buyback math. That is the tension worth tracking into 2027 — a bank levered long its asset sensitivity while its equity base absorbs the mark.
Net interest income had spent eight quarters oscillating in the mid-$50 millions before this quarter's step-up, which is why the margin print mattered more than the headline EPS. Meanwhile price to book sits near 1.2x versus a 2017 peak of 1.9x — the valuation argument behind the repurchase activity.
Loan growth trimmed, credit still clean
The quarter was not all tailwind. New production of $400 million (with $276 million funded) was almost exactly offset by $281 million of payoffs, heavily weighted to CRE and including four multifamily loans that accounted for just over half. The pipeline slipped from $1.4 billion to $1.2 billion, and guidance was cut from mid-single digits to low-to-mid single digits for 2026. That is a walk-back from January's optimism, when Keith said “I would love to tell you, I'm super optimistic that we may beat our numbers.” — Keith Donahoe, President and CEO · 2026-01-29 Analysts will note the payoff treadmill has now reset guidance twice in three quarters.
Credit, however, behaved. Classified assets fell $1 million as those multifamily credits refinanced with life companies, a debt fund, and an open-market sale. NPAs ticked up 61.6% largely on one $5.2 million CRE loan that repaid in full on October 1. This is the fourth consecutive quarter of the same conversation about Texas multifamily oversupply — “any Texas-based lender doing multifamily construction and term loans has seen weakness” — Keith Donahoe, President and CEO · 2026-04-30 — and the reserve at 0.94% of loans has barely moved.
Deposits: hand-to-hand combat, and a capital pivot
Deposits fell $155.6 million (2.5%) to roughly $6.0 billion. The detail matters: public fund deposits dropped $200.2 million, of which about $141 million was CDs maturing at renewal rates the bank refused to pay. Brokered deposits came back (+$49.4 million) and wholesale funding rose $334.3 million to $1.7 billion. New accounts priced at 2.64% versus 1.57% for the existing book — the clearest evidence yet that the marginal deposit is expensive. Exception pricing discipline, a recurring refrain here for several quarters, is what kept the reported cost of deposits at $1.89 versus $1.94 in June.
This is not a Southside problem alone. Across this week's reporters, cost of deposits and funding-rate commentary recurred from Turkish and Spanish banks to US regionals, and the broader market's own keyword set is dominated by core deposits and lending rates. Southside is riding a sector wave, not creating one — which is precisely why its 15bp asset-liability gap is the differentiator rather than the theme.
The strategic answer is C&I. Commercial loans including owner-occupied rose ~5% and now sit at 18% of the portfolio from 16% at year-end, with 24% of the pipeline. “We truly believe that C and I business drags in more deposits, stickier deposits, and a lot of times cheaper priced deposits.” — Keith Donahoe, President and CEO · 2026-10-29 A new HELOC product launched in the last 30 days and consumer lending, a portfolio that has shrunk every year for a decade, is being re-attacked. None of it moves the needle in Q4.
Capital is where the price action and the rhetoric converge. No buyback in Q3; then 36.5 thousand shares at an average of $30 after quarter-end — below where the stock traded in July. “Unfortunately, when you see us buying stock, it is because our stock is trading below where we think it should be.” — Keith Donahoe, President and CEO · 2026-10-29 The stock is down 4.6% over 90 days and 26% below its 2021 high, drifting sideways while the market's attention is consumed by AI data center buildouts. M&A — a $1 billion target is comfortable, with 2027 floated as the window — remains the swing factor for a bank with common equity of $882 million and only modest organic growth to deploy it into.
So what changed? A NIM inflection that finally validates three years of balance-sheet repositioning, a guidance trim that says the payoff treadmill is not done, and a securities book that quietly became the largest risk to tangible capital. The funding cost line held flat this quarter — that, more than anything, is the story. Whether it holds into 2027 is the question.