Every bank and credit union in the United States operates under a charter — a legal license to take deposits and do business as a financial institution — and is overseen by one or more government supervisors. Which charter an institution holds determines who writes its rulebook, who examines its books, and even what its name can be. The result is a uniquely American arrangement known as the “dual banking system,” and once you understand it, the alphabet soup of OCC, the Fed, FDIC and NCUA suddenly makes sense.
What a charter actually is
A charter is the founding document and license that brings a bank into existence. You cannot legally take deposits from the public, call yourself a “bank,” and offer federally insured accounts without one. The charter spells out what the institution is allowed to do, what capital it must hold, and — crucially — which government agency gets to charter it and supervise it for the rest of its life. In the U.S., an institution can choose between a federal charter and a state charter. That choice is the root of the whole system.
The dual banking system
Since the National Banking Acts of the 1860s, the United States has run two parallel chartering tracks at the same time. A bank can be chartered by the federal government, or it can be chartered by one of the fifty states. Both kinds of bank coexist, compete, and offer essentially the same products to customers. This is the “dual” in dual banking. No other major economy splits the power to license banks quite this way, and it is a deliberate check on concentrated authority — states and Washington each keep a hand on the wheel.
The trade-offs are real. A national charter offers uniform nationwide rules and a single primary federal supervisor; a state charter can offer rules tailored to local conditions, sometimes lower fees, and a supervisor who is physically closer. Banks periodically “convert” from one charter to the other when the balance of cost, powers and oversight shifts. Both routes lead to a fully legitimate, federally insured bank.
National banks and the OCC
A national bank is chartered and supervised by the Office of the Comptroller of the Currency (OCC), an independent bureau of the U.S. Treasury created in 1863. The OCC writes the rules for national banks, sends examiners to inspect them, and can approve or deny new charters, branches and mergers. The tell-tale sign of a national charter is the name: national banks almost always end in “National Association” or the abbreviation “N.A.” You can see this in the legal names of the country’s largest institutions, such as JPMorgan Chase Bank, National Association, Bank of America, National Association, and Wells Fargo Bank, National Association.
The OCC also charters and supervises federal savings associations (federal thrifts), a power it absorbed in 2011 when the old Office of Thrift Supervision was abolished after the financial crisis.
State banks, member and non-member
A state bank is chartered by its home state’s banking department or commissioner. But a state charter alone is not the whole story, because every state bank also has a federal supervisor on top of the state regulator. Which federal agency that is depends on a single choice: whether the bank joins the Federal Reserve System.
- State member banks are state-chartered banks that have joined the Federal Reserve System. Their primary federal supervisor is the Federal Reserve, working alongside the state.
- State non-member banks are state-chartered banks that have not joined the Fed. Their primary federal supervisor is the FDIC, again alongside the state.
So a single state bank typically answers to two regulators: its state banking department, plus either the Federal Reserve or the FDIC. National banks, by contrast, are members of the Federal Reserve System automatically but are supervised primarily by the OCC.
The Federal Reserve’s special role
The Federal Reserve wears more than one hat. As described above, it is the primary federal supervisor of state member banks. But it has a second, much broader job: the Fed supervises all bank holding companies — the parent corporations that sit on top of banks — regardless of how the underlying bank is chartered. So even a national bank supervised day-to-day by the OCC will usually have a holding-company parent overseen by the Federal Reserve. The Fed also sets monetary policy and acts as lender of last resort, but for supervision purposes its reach over holding companies is what ties the whole structure together. To understand how parents and subsidiaries fit, see our guide to who owns your bank.
The FDIC: supervisor and universal insurer
The Federal Deposit Insurance Corporation (FDIC) plays two distinct roles, and it is easy to confuse them. First, it is the primary federal supervisor of state non-member banks — that is one specific slice of the industry. Second, and far more broadly, the FDIC is the deposit insurer for essentially every U.S. bank and thrift, no matter who charters or supervises it. A national bank overseen by the OCC, a state member bank overseen by the Fed, and a state non-member bank overseen by the FDIC itself are all insured by the FDIC up to the standard limit of $250,000 per depositor, per insured bank, per ownership category. Supervision is divided; deposit insurance is universal.
Savings associations and thrifts
Savings associations — also called thrifts or savings and loans — are a historically distinct kind of institution founded to promote home ownership and personal savings. Today they look very much like banks to a customer and carry FDIC insurance. Federal thrifts are chartered and supervised by the OCC; state-chartered thrifts answer to their state plus a federal supervisor. The category has shrunk over the decades, but you will still find savings banks and savings associations throughout the directory.
Credit unions: a parallel universe
Credit unions sit entirely outside the bank charter system because they are not banks — they are not-for-profit cooperatives owned by their members. They have their own chartering and insurance machinery run by the National Credit Union Administration (NCUA).
- Federal credit unions are chartered and supervised directly by the NCUA.
- State-chartered credit unions are chartered by a state regulator, with the NCUA typically supervising alongside.
Crucially, the NCUA is also the insurer. Member deposits (technically “shares”) are protected by the National Credit Union Share Insurance Fund (NCUSIF) up to $250,000 — the credit-union equivalent of FDIC coverage, backed by the full faith and credit of the United States. The largest example, Navy Federal Credit Union, is a federally chartered credit union supervised by the NCUA. For a deeper comparison of the two models, read banks vs. credit unions.
Who charters, supervises and insures what
| Institution type | Chartering body | Primary federal regulator | Insurer |
|---|---|---|---|
| National bank (N.A.) | OCC | OCC | FDIC |
| Federal savings association / thrift | OCC | OCC | FDIC |
| State member bank | State banking department | Federal Reserve | FDIC |
| State non-member bank | State banking department | FDIC | FDIC |
| Bank holding company | (parent corporation) | Federal Reserve | n/a (insures its bank subsidiaries) |
| Federal credit union | NCUA | NCUA | NCUA (NCUSIF) |
| State credit union | State regulator | NCUA | NCUA (NCUSIF), usually |
Why the charter choice matters to you
From the teller window, a national bank and a state bank are indistinguishable, and both carry the same $250,000 insurance. But the charter shapes the rules the institution follows, the fees it can charge, the speed of innovation, and how aggressively it is examined. It is a window into how an institution is run — which is why we surface it on every profile.
How to read charter and regulator on this site
Every institution profile in this directory is built directly from federal public data, so the charter facts are not our opinion — they come straight from the official registries. When you open a bank or credit-union page, look for these fields:
- Charter class — whether the institution is a national bank, state member bank, state non-member bank, savings association, or credit union.
- Primary regulator — the lead federal supervisor (OCC, Federal Reserve, FDIC or NCUA).
- Identifiers — the FDIC Certificate number for banks, the NCUA Charter number for credit unions, and the RSSD ID (the Federal Reserve’s unique institution identifier) where available. These let you cross-check any institution against the regulators’ own databases.
You can start exploring from the bank directory or the credit-union directory. To see exactly which government sources we draw from and how the fields are mapped, read our methodology.
Key takeaways
- The U.S. runs a dual banking system: banks can be chartered federally or by a state, and both kinds coexist.
- National banks (names ending in “N.A.”) are chartered and supervised by the OCC.
- State banks add a federal supervisor: the Federal Reserve for state member banks, the FDIC for state non-member banks — plus the state itself.
- The Federal Reserve also supervises all bank holding companies, regardless of how the underlying bank is chartered.
- The FDIC insures essentially every U.S. bank; credit unions are chartered/insured through the NCUA and its NCUSIF.
- Each profile here shows charter class, primary regulator, and the official FDIC cert / NCUA charter / RSSD identifiers so you can verify everything yourself.