Funding cost relief stalls for IBOC
- IBOC makes most of its money from net interest income, the spread between what it earns on loans and securities and what it pays on deposits.
- Q2 2026 net income fell sequentially to $95.8 million, showing pressure on earnings.
- Interest expense ticked up to $49.3 million, pausing a three-quarter streak of declines.
- The stock carries a price question because growth and performance look only moderate.
- The biggest company-specific risk is its exposure to the U.S.-Mexico border economy.
The funding cost tailwind stalls
The case for IBOC has moderated slightly. The bank had seen three straight quarters of falling funding costs, but that trend paused in Q2 2026. Interest expense ticked up to $49.3 million, and net income dropped sequentially to $95.8 million.
That matters because banks live on spread. Net interest margin means the gap between what a bank earns on assets and what it pays for funding. When funding costs stick at higher levels, that spread struggles to improve without fast loan growth.
The bull case relies heavily on the Federal Reserve. A definitive rate cut remains the primary lever for expanding margins and boosting earnings power. If rates fall, deposit costs could resume their decline.
The bear case centers on deposit competition. If depositors demand more yield, interest expense will continue to cap earnings. The current view is balanced, waiting for the next move in rates.
A spread bank with fee add-ons
IBOC is a bank holding company. It takes deposits from customers, then uses that money to make loans and buy investment securities. The bank earns interest on those assets and pays interest on many deposits.
Most revenue comes from interest income. For the six months ended June 30, 2024, interest income made up about 87% of total revenue, while non-interest income made up about 13%. That mix shows how much the business depends on rates, deposit costs, and loan demand.
The funding base is central. As of June 30, 2024, total deposits were $12.0 billion, including non-interest-bearing demand deposits, savings and interest-bearing demand accounts, and time deposits. Cheap and sticky deposits are a major advantage when rates move lower.
The model breaks when depositors demand higher rates faster than asset yields rise, or when borrowers stop paying. That is why the current stall in interest expense declines is so important to the thesis.
Loans, securities, deposits, fees
Loan portfolio
Loans are the largest earning asset class. They produce interest income, but they also carry credit risk if borrowers weaken.
Investment securities
The securities portfolio is mainly debt securities. It adds interest income and liquidity, but its value and yield move with rates.
Non-interest-bearing demand deposits
These deposits are valuable because the bank does not pay interest on them. They help protect margins when funding costs rise elsewhere.
Savings, interest-bearing demand, and time deposits
These accounts fund loans and securities, but they can become more expensive when customers shop for higher rates.
Service fees and financial product income
Fees are a smaller revenue stream than interest income. They still help diversify the bank away from pure spread income.
No formal segment split
IBOC reports consolidated results rather than formal operating segments. The mix shown uses the six months ended June 30, 2024, when interest income was about 87% of total revenue and non-interest income was about 13%.
What could still break
Deposit costs remain sticky
High impact · Medium oddsThe bull case depends on lower funding costs. Interest expense ticked up in Q2 2026, showing that funding cost pressures may cap near-term margin expansion if depositors continue to demand higher rates.
Border economy credit shock
High impact · Medium oddsIBOC has meaningful exposure to the U.S.-Mexico border economy. A local slowdown, trade shock, or borrower stress could raise credit losses and slow loan growth.
Loan growth stays soft
Medium impact · Medium oddsLower deposit costs help margins, but earnings can still stall if loan balances do not grow. The best version of the bull case needs cheaper funding to support more profitable lending.
AI and fintech gap
Medium impact · Medium oddsIBOC says it could fall behind if it cannot adopt AI-driven technology as fast as peers, larger banks, or fintech companies. That risk matters because customers may expect faster, smarter digital banking tools.
Crypto and blockchain disruption
Medium impact · Low oddsThe company warns that friendlier rules for digital assets could reduce demand for some traditional banking services. This is a longer-term risk, but it is now named by management.
In one breath
What does International Bancshares Corporation do?
IBOC owns banks that take deposits, make loans, buy securities, and collect service fees. Most of its revenue comes from interest earned on loans and securities.
Why does interest expense matter so much for IBOC?
Interest expense is what the bank pays to fund itself, mainly through deposits. When that cost falls, the bank can keep more of the interest it earns on loans and securities.
What is the main bull case for IBOC?
The bull case relies on a Federal Reserve pivot to a dovish policy. A definitive rate cut could lower funding costs and boost earnings power.
What is the biggest risk for IBOC?
The biggest near-term risk is sticky deposit competition or a credit shock in its U.S.-Mexico border markets. Longer term, the bank also faces technology and fintech competition.
Sources and research notes
This page combines Finn's company research with public filings and other cited materials. The thesis is reviewed when material company information changes; Finn Scores use the latest available scoring data.
- Thesis reviewed
- August 23, 2026
- Score data
- September 6, 2026
- Reviewed by
- Shivam Bharuka
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