Cullen/Frost Bankers, Inc. (CFR)

Cullen/Frost Bankers is a bank. Not a fintech, not an investment firm — a real, traditional bank that takes deposits from people and businesses, lends that money out to other people and businesses, and earns money on the spread between the interest it pays on deposits and the interest it charges on loans. The company is based in Texas and operates through a network of branches across Texas and adjacent states, serving everything from a farmer who needs a seasonal line of credit to a family saving for retirement to a mid-size business managing payroll and cash.

A real bank with a long history

Cullen/Frost was founded in 1907 in Houston — over a century ago — and has survived two world wars, the Great Depression, the oil busts of the 1980s, the mortgage crisis of 2008, and countless interest-rate cycles. That longevity says something: the bank does not chase flashy trends. It lends to real people and real businesses in its territory. It holds deposits. It earns a margin. It survives downturns because it knows its customers and takes measured risks.

The Texas footprint matters. Texas has been a growing state — population rising, businesses moving in, income rising over the long term. A bank rooted in Texas has benefitted from that demographic and economic tailwind. But the bank also faces the same cycles that hit all banks: when interest rates fall, lending dries up and net interest margin (the difference between what you earn on loans and what you pay on deposits) compresses. When rates rise, loan losses tend to follow as borrowers struggle to service debt. When the economy is strong, more companies borrow, more people earn more, and default rates fall. When it is weak, the opposite happens.

The basic mechanics of banking

Cullen/Frost takes deposits — checking accounts, savings accounts, money-market accounts — and people and businesses keep their money there. The bank pays a small amount of interest on those deposits (sometimes none if it is a checking account). The bank then lends that money out at a higher rate of interest. The loan might be a mortgage, a car loan, a line of credit for a business, or a bigger loan to finance a construction project or a corporate acquisition.

The difference between what the bank earns on loans and what it pays on deposits is the net interest margin. If the bank earns 5 per cent on a loan and pays 0.5 per cent on the deposit that funded it, the margin is 4.5 per cent. Multiply that by the total amount of loans the bank has outstanding and you get net interest income — the biggest line item on the bank’s income statement. Everything else — trading, advisory services, transaction fees — is much smaller.

What makes a regional bank different from a national giant

Cullen/Frost is not JPMorgan, which operates thousands of branches globally and manages trillions in assets and investment capital. It is not a shadow bank or a fintech burning through venture capital to disrupt banking. It is what is called a “regional bank” — a community-focused lender with perhaps 100 to 300 branches concentrated in one or a few regions.

The advantage of being regional is that the bank’s management and loan officers know their market. The bank president might know the owner of a mid-size manufacturing company. The loan officer has seen multiple business cycles in her region and can assess whether a borrower is likely to repay. Decision-making is faster and more personalized than at a megabank. The disadvantage is scale: a big bank can spread its operating costs across far more assets and customers. A regional bank has to work harder to stay profitable.

Lending — the core business and the core risk

Cullen/Frost makes the bulk of its money by lending. The categories are straightforward: residential real estate (mortgages); commercial real estate (loans to build or buy office buildings, shopping centers, apartments); commercial and industrial (loans to small and mid-size businesses for equipment, expansion, or working capital); and consumer (personal loans, auto loans, home equity lines). Each category has a different risk profile. A mortgage backed by a house is collateralized and usually safer. An unsecured line of credit to a struggling business is riskier.

The bank sets aside an allowance for loan losses — an estimate of how much of its loans will default. When the economy is humming, this allowance can be smaller. When economic stress rises, the bank must increase it, which hits earnings. When loans actually default, the bank writes them off against the allowance.

Loan losses are inevitable. Some borrowers will lose their job, a business will fail, a real estate market will crash locally. The bank’s job is to minimize these losses through careful underwriting (saying no to risky borrowers), diversification (not putting all the money into one industry or sector), and active loan management (staying in touch with borrowers to catch problems early).

Deposits are the other side of the equation

The bank’s cost of funds is set by what it must pay depositors to keep their money with the bank. When the Federal Reserve raises interest rates, savers expect to earn more at the bank. The bank must raise deposit rates or lose deposits to competitors. That directly hits margins. When rates are near zero, as they were in the 2020–2021 period, savers earn almost nothing, which means the bank can maintain a fat margin even if it lends at low rates.

Deposit stability is crucial. If all the bank’s deposits are in the form of time deposits (savings accounts with a fixed term), they are predictable — the bank knows when they will mature and can plan accordingly. If deposits are in checking accounts, they can flee quickly if a panic or a better offer elsewhere (like a high-yield savings account at a bigger competitor) arrives. In 2023, when regional banks suffered deposit runs, it was partly because depositors with large balances had become deposit-focused rather than relationship-focused — they moved money in pursuit of the highest rate, which hit banks like Cullen/Frost.

Wealth management and other services

Beyond lending and deposits, Cullen/Frost offers wealth management — helping rich customers manage and invest their money. This is higher-margin than basic banking because wealthy clients pay advisory fees that are not subject to interest-rate swings. The bank also earns fees on trust services, on underwriting securities offerings, and on transaction fees for things like wire transfers. These are smaller pieces of the pie, but they smooth out swings in the interest-rate-dependent business.

The regulatory environment

Banks are among the most regulated businesses on Earth. They must maintain a minimum amount of capital relative to their risk-weighted assets (capital requirements). They must stress-test their portfolios against hypothetical bad scenarios. They must file detailed reports to the Federal Reserve, the OCC, and the FDIC. They face periodic audits and examinations. They must comply with anti-money-laundering rules, know-your-customer rules, and a range of other statutes designed to prevent fraud and financial crime.

This regulatory burden is expensive, but it also serves a protective function. Depositors at Cullen/Frost can be confident their money is there because the bank is required to maintain capital buffers and because deposits are insured (up to $250,000 per account) by the FDIC — a government backstop created after the Great Depression.

Interest rates, cycles, and economic sensitivity

Cullen/Frost’s profitability swings with interest rates and the economy. When the Federal Reserve raises rates sharply (as it did in 2022–2023), margins are squeezed initially because deposit costs rise faster than loan yields adjust. But over time, higher rates can improve returns as new loans are booked at higher rates. When rates fall, margins expand initially, but falling rates usually come with economic weakness, which increases loan losses.

The bank is also sensitive to the regional economy. Energy (oil and gas) is a significant part of the Texas economy, so oil price collapses hit Cullen/Frost. Real estate cycles matter a lot. A bust in housing or commercial real estate in the bank’s markets increases defaults and loan losses.

How to research Cullen/Frost

The bank’s annual 10-K filing (SEC CIK 0000039263) is the key document. It breaks down the loan portfolio by type, shows the allowance for loan losses, lists nonperforming assets, and details the deposit mix. Read the capital section to see the bank’s leverage and liquidity position. The quarterly 10-Q filings update these numbers and include management commentary on trends. Watch earnings calls for any discussion of loan growth, deposit trends, net interest margin, loan losses, and management’s outlook on the regional economy.

The bank’s return on assets (net income divided by total assets) and return on equity (net income divided by shareholder equity) show how efficiently it uses money. Compare those to peers like Zions Bank or Comerica — other regional banks — to see if Cullen/Frost is above or below average. Monitor the federal funds rate, long-term interest rates, and any stress signals in real estate or energy markets in Texas, because all three affect the bank’s performance. Banking is cyclical and interest-rate sensitive, so expect earnings to swing more than a stable, diversified industrial company. But a well-run regional bank with a strong capital position and a good home market is a durable, reliable business.