How Commercial Banks Shape Economies

A commercial bank is a financial institution that takes deposits, makes loans and processes everyday payments for individuals and businesses, operating inside a regulatory system that ties routine banking to the wider economy.

Why the Line Between Commercial and Investment Banks Blurred

From 1933 to 1999, the Glass Steagall Act drew a clean line between the two types of institutions. Banks that helped companies sell shares were investment banks. Banks that focused on deposits and loans were commercial banks. That separation weakened through the late 1990s and was effectively repealed, so the old labels no longer describe reality. JPMorgan Chase Bank, the largest commercial bank in the country by assets as of March 31, 2024, also served as one of the lead underwriters on Facebook's initial public offering back in 2012, a job that once would have belonged strictly to an investment bank.

What Commercial Banks Actually Do for Customers

Since the legal boundary faded, it makes more sense to define a commercial bank by what it does rather than what it avoids. Nearly every commercial bank handles these core functions:

• Accepting deposits
• Lending money
• Processing payments
• Issuing bank drafts and checks
• Offering safety deposit boxes

Beyond that list, many commercial banks also broker insurance, give investment advice, issue credit cards and offer overdraft protection. The through line is service to a person or a business rather than trading securities for the bank's own account.

How a New Commercial Bank Gets Off the Ground

Thousands of commercial banks operate in the United States, from giants like Wells Fargo and Citibank down to small community institutions, but launching one is neither quick nor cheap. Rules differ by state, though the process generally starts when an organizing group raises several million dollars in seed capital and assembles a management team with banking experience alongside a board of directors.

Once that leadership is in place, the group picks a location and writes out its vision for the bank, then submits the plan and background on its board and managers to regulators. That review alone can cost thousands of dollars, and regulators frequently send the application back with changes required before they will grant a charter.

From Charter to Open Doors

Getting a charter does not mean the bank is ready for customers. Once approved, the bank has a year to become operational, a window that includes securing FDIC insurance, hiring staff, purchasing equipment and passing two more rounds of regulatory inspection before it can open. Counting the preparation that happens before the first filing, the entire path from idea to open branch typically runs several years.

Getting to the point where a bank can lend out deposited money as consumer loans requires millions in capital. Some of that comes from private investors who are later repaid through a public share offering. A charter bank can technically stay 100% privately funded, but most eventually go public because tradable shares make it far easier to cash out early investors, which is why an eventual IPO is often part of the plan from day one.

Commercial Banks as Capital Allocators

Strip away the branches and tellers, and a commercial bank is essentially a pool of investment capital looking for a return. Management and the board decide how to allocate deposits and raised capital in ways they believe will pay off, and when they allocate well, the bank turns a profit and its share price tends to rise.

That makes a bank a mechanism serving two audiences at once, everyday depositors and borrowers on one side, and investors watching for returns on the other. A bank that satisfies both tends to thrive. One that fails at either job risks collapse, and when that happens the FDIC steps in, protects depositors and works to move the failed bank's assets to a stronger institution.

What FDIC Insurance Changed for Depositors

Bank deposits were not always protected. During the Great Depression, when banks failed, depositors often lost their savings outright. Today, FDIC insured deposits cover up to 250,000 dollars per depositor, per insured bank, for each account ownership category, meaning a bank failure no longer wipes out a customer's savings the way it once did.

Could the Economy Function Without Commercial Banks?

Take commercial banks out of the picture entirely and the effects would be immediate and severe. Credit and debit cards would stop working, automatic payments between businesses and individuals would halt, and companies would lose access to investment capital, a scenario that underscores just how embedded these institutions are in daily economic life. Most Main Street banks, local or national, fall under this same commercial bank definition, using customer deposits to fund loans and investments even when they look nothing like a Wall Street giant.