The structure of the U.S. banking system

Most developed economies have a small number of large banks operating under a single national regulator. The United States has roughly 4,500 commercial banks and savings institutions and a similar number of credit unions, chartered by either the federal government or the states, supervised by one of four federal banking agencies (or one of fifty state agencies), and organized in a holding-company structure that often layers a securities firm, an insurance company, and a non-bank lender on top of the bank itself. This is unusual. It is also the system Americans actually have, and understanding its shape is a prerequisite to understanding why so much of consumer-banking regulation is fragmented and why so many regulatory questions begin with "which agency."

This article describes the institutional landscape: the kinds of charters, the regulators that issue them, the holding-company structure that sits above them, and the historical reasons the country never consolidated its banking system the way most peer economies did. Subsequent foundation articles treat each regulator individually.

The dual banking system

A bank in the United States may be chartered by the federal government or by a state. The two systems coexist; an institution chooses one or the other at chartering and may convert in either direction, subject to regulatory approval. This is the "dual banking system," and it dates to the National Bank Act of 1864, which created federal bank charters while leaving the existing state systems in place. The political compromise of 1864 has not been undone; today, roughly two-thirds of U.S. banks (by count) are state-chartered, while a smaller number of federally chartered banks hold a disproportionate share of total assets.

A national bank is chartered and primarily supervised by the Office of the Comptroller of the Currency, a bureau of the Treasury Department. A state bank is chartered by the banking department of its home state and primarily supervised either by the Federal Reserve (if it has elected to become a member of the Federal Reserve System) or by the FDIC (if it has not), in addition to the state regulator. The OCC also charters federal savings associations (the modern thrift charter) and federal branches of foreign banks. See the OCC, state regulators, and chartering.

The result is that supervision of an individual bank typically involves at least two agencies — the state regulator and either the OCC, the Fed, or the FDIC — plus, for consumer-protection rules, the CFPB (for banks above $10 billion in assets) or the bank's prudential regulator (for smaller banks).

Charters available to consumer-facing depository institutions

For purposes of retail banking, the operative charters are:

• National bank charter (OCC). The original federal charter, dating to 1864. National banks may operate across state lines without separate state charters; they are subject to OCC supervision and most federal banking law.
• State bank charter (state agency, plus Fed or FDIC). The historically older type, predating the National Bank Act. State banks operate primarily in their home state but may expand through branching under the Interstate Banking and Branching Efficiency Act of 1994.
• Federal savings association charter (OCC). The modern thrift charter, descended from the savings-and-loan tradition. Functionally similar to a national bank, with historic emphasis on residential mortgage lending; the Office of Thrift Supervision, which used to charter and supervise thrifts, was eliminated by Dodd-Frank in 2010 and its authority transferred to the OCC and the Federal Reserve.
• State savings association charter (state agency, plus FDIC or Fed). The state-chartered counterpart.
• Federal credit union charter (NCUA). Available to member-owned cooperatives meeting common-bond, multiple-common-bond, or community-charter requirements. Insured by the National Credit Union Share Insurance Fund. See NCUA share insurance.
• State credit union charter (state agency, with NCUA share insurance in nearly all cases; a handful of state-chartered credit unions are insured privately by American Share Insurance, which is not federal insurance — confirm before relying on coverage at such an institution).
• Industrial loan company / industrial bank. A narrow specialty charter available in a small number of states (Utah being the most prominent), historically used by commercial firms to operate a deposit-taking subsidiary without becoming a bank holding company under the Bank Holding Company Act. FDIC-insured; supervised by the state and by the FDIC.

For nearly all retail consumer purposes, the differences among these charters are invisible. Deposit insurance is the same dollar limit (with separate funds for banks and credit unions); consumer-protection laws apply to all of them with minor variations; payment-system access is the same. The distinctions matter chiefly to the institution and its supervisors.

Why the United States has so many banks

For most of the country's history, banking was effectively a state-by-state business. State chartering laws restricted out-of-state expansion, and federal law followed suit: the McFadden Act of 1927 codified the prohibition on interstate branching. The result was a system in which each state — and, in some cases, each county — had its own roster of banks. At the peak in the mid-1980s, the United States had more than 14,000 commercial banks; by 2026, that number is roughly 4,500. The decline is the result of consolidation following the Riegle-Neal Interstate Banking and Branching Efficiency Act of 1994, which removed the McFadden Act restrictions and allowed nationwide branching.

Even after three decades of consolidation, the U.S. system remains far more fragmented than its peers. A few structural factors sustain this:

• Charter choice gives a bank options on its supervisor, which has historically supported a long tail of small institutions content to operate under a state regulator they know well.
• The credit-union sector, with separate insurance and a separate regulator, has its own continuing existence largely insulated from bank consolidation.
• Community banks under $10 billion in assets are subject to less-onerous regulatory burdens in many respects, including being supervised for consumer compliance by their prudential regulator rather than the CFPB.
• Some markets — agricultural, energy, niche industrial — continue to rely on small banks that understand local credit, and the banks have a sustainable economic niche even at small scale.

The four largest U.S. banks — JPMorgan Chase, Bank of America, Wells Fargo, and Citigroup — hold roughly 40% of insured deposits between them. The next dozen hold another quarter. The remaining ~35% is spread across roughly 4,500 institutions. The contrast with Canada (six banks holding more than 90% of system assets) or the United Kingdom (a similarly concentrated structure) is dramatic.

Bank holding companies

Most U.S. banks of any size are owned by a bank holding company — a parent corporation regulated by the Federal Reserve under the Bank Holding Company Act of 1956. The holding company is what trades on stock exchanges; the bank is its subsidiary. Larger holding companies also own broker-dealers, investment advisers, insurance agencies, and non-bank lenders, all consolidated under Federal Reserve supervision at the holding-company level.

The structure has a few consequences a depositor should know. First, when a news story describes "Bank of America" or "JPMorgan Chase," it is usually describing the holding company; the chartered bank inside it may be Bank of America, N.A. or JPMorgan Chase Bank, N.A., with the bank's separate financial statements available in the FDIC's call-report database. Second, deposit insurance attaches to the bank, not to the holding company; an insured deposit at the bank is insured even if the holding company is in distress, because the bank's assets and liabilities are legally separate. Third, the Fed's supervision of the holding company is what gave it the standing to intervene at the parent level in the Bear Stearns and Lehman Brothers crises (although neither of those firms was a traditional retail-bank holding company).

How the pieces fit together

The federal banking agencies — the OCC, the Federal Reserve, the FDIC, and the NCUA — coordinate through the Federal Financial Institutions Examination Council, which produces interagency guidance, common examination procedures, and the shared databases (call reports, the Home Mortgage Disclosure Act data, the CRA performance evaluations) that practitioners rely on. The CFPB, created by Dodd-Frank in 2010, has consumer-protection rulewriting authority that supersedes the agencies' prior consumer-rule offices and direct supervisory authority over institutions above $10 billion in assets. State banking departments retain authority over their state-chartered banks; some states (notably New York, California, and Massachusetts) operate aggressive consumer-protection regimes that supplement federal law.

The interplay produces some specific oddities. For consumer-compliance examination of a $1 billion community bank, the relevant federal agency is the bank's prudential regulator (OCC, Fed, or FDIC), not the CFPB. For a $50 billion regional bank, it is the CFPB. For a state-chartered credit union with $400 million in assets, it is the NCUA, with the state regulator participating. For a national bank with operations in all fifty states, federal preemption of certain state laws is itself a contested area, with the OCC and state attorneys general periodically litigating the boundary.

From a depositor's standpoint, the question that matters most is: when something goes wrong, who do I complain to? The CFPB's complaint portal accepts complaints about any consumer financial product, regardless of which regulator supervises the institution, and forwards complaints to the institution and to the appropriate prudential regulator. See the CFPB and consumer protection for the mechanics.

The non-bank fringe

Around the chartered depository system sits a much larger non-bank financial sector: money market funds, mortgage non-banks (which now originate the majority of U.S. residential mortgages), consumer finance companies, payment service providers, money transmitters, fintechs, and stablecoin issuers. Some of this non-bank activity interfaces with the banking system through sponsor-bank arrangements (see banking-as-a-service); some operates under state money-transmitter licensing without touching a bank's deposit base; some is functionally banking but escapes the bank regulatory perimeter through clever structuring. Recent policy debate has focused on whether and how to bring more of this activity inside the perimeter; the answer has implications for which agency will examine which firm in coming years.

Limits and uncertainty

This article describes the regulated depository system as of mid-2026. The boundaries of the system are shifting. The Section 1033 rulemaking on consumer data rights, the periodic political contests over CFPB authority, the post-2023 supervisory rewrites on regional banks, and the long-running question of whether stablecoin issuers should be regulated as banks all point at a system in which the lines drawn here may move. Where this site covers a specific regulator, agency, or rule that has been the subject of recent contestation, the relevant page flags it.