# Understanding Bank Runs: Definition, Examples, and Prevention Strategies

> **Definition**
>
> A bank run refers to a big number of customers pulling their deposits due to concerns about the bank’s financial stability.

## What Is a Bank Run?

A bank run refers to a situation when customers of a bank or other financial institution withdraw their deposits at the same time over fears about the bank’s solvency. As more people withdraw their funds, the probability of [default](https://www.investopedia.com/terms/d/default2.asp) increases, which, in turn, can cause more people to withdraw their deposits. In extreme cases, the [bank’s reserves](https://www.investopedia.com/terms/b/bank-reserve.asp) may not be sufficient to cover the withdrawals. Bank runs often are associated with the Great Depression, but there have been more recent examples, such as those at Silicon Valley Bank, Washington Mutual, and Wachovia Bank. Consumer deposits are protected, up to $250,000, at banks insured by the Federal Deposit Insurance Corp. (FDIC).

### Key Takeaways

*   Bank runs occur when a large number of customers withdraw funds simultaneously due to fear of insolvency.
*   Panic, not actual insolvency, often triggers bank runs, which can lead to a bank's collapse.
*   Major historical bank runs occurred during the Great Depression and the 2008 financial crisis.
*   The [Federal Deposit Insurance Corp. (FDIC)](https://www.investopedia.com/terms/f/fdic.asp) was created in 1933 to insure deposits and reduce the risk of bank runs.
*   A silent bank run involves electronic withdrawals without customers physically visiting the bank.

![Bank Run: When a large group of depositors rush to withdraw their money from a bank deemed at risk of going under.](https://www.investopedia.com/thmb/huqqStM9MTgp3f60enPP91HVN5A=/1500x0/filters:no_upscale():max_bytes(150000):strip_icc()/bankrun.asp-final-74947ee26c5e4d2394b4b3d6bec6246d.png)

*— Zoe Hansen / Investopedia*

## Understanding the Mechanics of Bank Runs

Bank runs happen when a large number of people start making withdrawals from a bank because they fear the institution will run out of money. A bank run is typically the result of panic rather than true [insolvency](https://www.investopedia.com/terms/i/insolvency.asp). However, a bank run triggered by fear can push a bank into bankruptcy.

Most institutions have a set limit on how much they store in their vaults daily. These limits are set based on need and security reasons. Many banks also keep specific amounts in reserve at the nation’s central bank to minimize the risks related to bank runs and other issues. In fact, the Federal Reserve pays them interest to do so, a program which it calls Interest on Reserve Balances (IORB). This program gives banks an incentive to keep deposits in reserve.

Because banks typically keep only a small percentage of deposits as cash on hand, they must increase their cash position to meet the withdrawal demands of their customers. One method a bank uses to increase cash on hand is to sell [assets](https://www.investopedia.com/terms/a/asset.asp)—sometimes at significantly lower prices than if it did not have to sell quickly. Losses taken when selling assets at lower prices can cause customer concerns, which can trigger withdrawals.

## Historical and Recent Bank Run Examples

In modern history, bank runs are often associated with the Great Depression. In the wake of the [1929 stock market crash](https://www.investopedia.com/terms/s/stock-market-crash-1929.asp), American depositors panicked and began withdrawing their deposits. A succession of bank runs on thousands of banks occurred in the early 1930s, creating a domino effect on the economy.

More recent examples of significant bank runs include those on Silicon Valley Bank, Washington Mutual Bank (WaMu), and Wachovia Bank.

### Silicon Valley Bank

The collapse of [Silicon Valley Bank](https://www.investopedia.com/what-happened-to-silicon-valley-bank-7368676) in March 2023 was a result of a bank run caused by venture capitalists. The bank reported that it needed $2.25 billion to shore up its balance sheet, and by the end of the following business day, customers had withdrawn about $42 billion. As a result, regulators closed the bank and took control of its assets.

Silicon Valley Bank had last reported $209 billion in assets as of the fourth quarter of 2022, making it the second-largest bank failure of all time.  

### Washington Mutual (WaMu)

Washington Mutual (WaMu), which had about $310 billion in assets at the time of its failure in 2008, was the largest bank failure in the United States. Its collapse was caused by several factors, including a poor housing market and rapid expansion. The bank also suffered a run when customers withdrew $16.7 billion within two weeks.

JPMorgan Chase eventually bought Washington Mutual for $1.9 billion.  

### Wachovia Bank

Wachovia Bank was also shuttered after depositors withdrew more than $15 billion over a two-week period in 2008 following negative earnings results. Wachovia was eventually acquired by Wells Fargo for $15 billion.

Much of the withdrawals at Wachovia were concentrated among commercial accounts with balances above the limit insured by the FDIC, drawing those balances down to just below the FDIC limit.  

> **Fast Fact**
>
> The failure of large investment banks like Lehman Brothers, AIG, and Bear Stearns was not the result of a bank run. Instead, these bank failures resulted from a credit and liquidity crisis involving derivatives, asset-backed securities, and poor risk management practices.

## Strategies to Prevent Bank Runs

In response to the turmoil of the 1930s, governments took several steps to diminish the risk of future bank runs. Perhaps the biggest was establishing [reserve requirements](https://www.investopedia.com/terms/r/requiredreserves.asp), which mandated that banks had to maintain a certain percentage of total deposits on hand as cash. This requirement has since been reduced to zero by the Federal Reserve because other monetary policy tools have been created.

Additionally, the U.S. Congress established the FDIC in 1933 to insure bank deposits in response to the many bank failures in the preceding years. Its mission is to maintain stability and public confidence in the U.S. financial system.

The FDIC provides insurance based on ownership category. There are several FDIC-recognized ownership categories, but generally, each depositor is insured for up to $250,000 in each different category.

> **Fast Fact**
>
> In some cases, the FDIC may extend its coverage. For example, when Silicon Valley Bank failed in 2023, the FDIC used funds from the Deposit Insurance Fund to fully reimburse depositors. The money in the fund is furnished by quarterly fees assessed on banks.

In some cases, banks need to take a more proactive approach if faced with the threat of a bank run. For example, they may temporarily close to prevent people from withdrawing their money en masse. Franklin D. Roosevelt implemented another solution when he declared a bank holiday in 1933, calling for inspections to ensure banks’ [solvency](https://www.investopedia.com/terms/s/solvency.asp) so they could continue operating.  

## What Is a Silent Bank Run?

A [silent bank run](https://www.investopedia.com/terms/s/silent-bank-run.asp) is when depositors withdraw funds electronically in large volumes without physically entering the bank. Silent bank runs are similar to other bank runs, except funds are withdrawn via Automated Clearing House (ACH) transfers, wire transfers, and other methods that do not require physical withdrawals of cash.

## What Is Meant by a Run on the Bank?

This happens when people try to withdraw all of their funds for fear of a bank collapse. When this is done simultaneously by many depositors, the bank can [run out of cash](https://www.investopedia.com/diamond-dybrig-model-theory-of-bank-runs-6892094), causing it to become insolvent.

## Why Is a Bank Run Bad?

Bank runs can bring down banks and cause a more systemic [financial crisis](https://www.investopedia.com/terms/f/financial-crisis.asp). A bank usually only has a limited amount of cash on hand that is not the same as its overall deposits. So, if too many customers demand their money, the bank simply won’t have enough to return to their depositors.

## The Bottom Line

A bank run is when customers flock to banks, either physically or online, to withdraw their funds because they lose confidence in the bank. In extreme cases, they can cause the collapse of a bank, as a bank run did in 2023 when Silicon Valley Bank became insolvent.

To reduce the risk of losing money in a bank run, keep deposits under the FDIC-insured $250,000 limit. If you need to deposit more funds, you can open an account at another bank and receive the same protection.  

> **Article Sources**
>
> 1.  Cornell University, CU Blog Service. “[Bank Runs, Information Cascades, and the Great Depression](https://blogs.cornell.edu/info2040/2014/11/21/bank-runs-information-cascades-and-the-great-depression/).”
>     
> 2.  Federal Reserve Bank of St. Louis, The FRED Blog. “[How Much Do Banks Keep In the Vault?](https://fredblog.stlouisfed.org/2018/12/how-much-cash-do-banks-keep-in-the-vault/)”
>     
> 3.  Board of Governors of the Federal Reserve System. “[Interest On Reserve Balances](https://www.federalreserve.gov/monetarypolicy/reserve-balances.htm).”
>     
> 4.  U.S. Social Security Administration. “[The Depression](https://www.ssa.gov/history/bank.html).”
>     
> 5.  Federal Reserve Bank of St. Louis. “[Understanding The Speed and Size of Bank Runs in Historical Comparison](https://www.stlouisfed.org/on-the-economy/2023/may/understanding-the-speed-and-size-of-bank-runs-in-historical-comparison).”
>     
> 6.  Silicon Valley Bank. “[Message To Stakeholders Regarding Recent Strategic Actions Taken by SVB](https://s201.q4cdn.com/589201576/files/doc_downloads/2023/03/Q1-2023-Investor-Letter.FINAL-030823.pdf).”
>     
> 7.  California Department of Financial Protection and Innovation. “[Order Taking Possession Of Property and Business](https://dfpi.ca.gov/wp-content/uploads/sites/337/2023/03/DFPI-Orders-Silicon-Valley-Bank-03102023.pdf).”
>     
> 8.  Federal Deposit Insurance Corp. “[FDIC Creates A Deposit Insurance National Bank of Santa Clara to Protect Insured Depositors of Silicon Valley Bank, Santa Clara, California](https://www.fdic.gov/news/press-releases/2023/pr23016.html).”
>     
> 9.  U.S. Office of Thrift Supervision, via Internet Archive Wayback Machine. “[OTS Fact Sheet On Washington Mutual Bank](https://web.archive.org/web/20081001163230/http://files.ots.treas.gov/730021.pdf).”
>     
> 10.  JPMorgan Chase. “[JPMorgan Chase Acquires The Deposits, Assets, and Certain Liabilities of Washington Mutual’s Banking Operations](https://jpmorganchaseco.gcs-web.com/news-releases/news-release-details/jpmorgan-chase-acquires-deposits-assets-and-certain-liabilities).”
>      
> 11.  CATO Institute. “[Run, Run, Run: Was The Financial Crisis Panic Over Institution Runs Justified?](https://www.cato.org/sites/cato.org/files/pubs/pdf/pa747_web_1.pdf)”
>      
> 12.  Board of Governors of the Federal Reserve System. “[The Acquisition of Wachovia Corporation by Wells Fargo & Company](https://www.federalreserve.gov/newsevents/testimony/alvarez20100901a.htm).”
>      
> 13.  Brookings Institution. “[History Credits Lehman Brothers’ Collapse For the 2008 Financial Crisis. Here’s Why That Narrative Is Wrong](https://www.brookings.edu/research/history-credits-lehman-brothers-collapse-for-the-2008-financial-crisis-heres-why-that-narrative-is-wrong/).”
>      
> 14.  National Bureau of Economic Research, Public Use Data Archive. “[The Fed and Lehman Brothers](https://data.nber.org/data-appendix/w22410/The%20Fed%20and%20Lehman%20Brothers.pdf).”
>      
> 15.  Board of Governors of the Federal Reserve System. “[Reserve Requirements: History, Current Practice, and Potential Reform](https://www.federalreserve.gov/monetarypolicy/0693lead.pdf).” Page 574.
>      
> 16.  Board of Governors of the Federal Reserve System. “[Reserve Requirements](https://www.federalreserve.gov/monetarypolicy/reservereq.htm).”
>      
> 17.  Federal Deposit Insurance Corp. “[The First Fifty Years](https://www.fdic.gov/resources/publications/first-fifty-years/book/first-fifty-years.pdf).”
>      
> 18.  Federal Deposit Insurance Corp. “[Your Insured Deposits](https://www.fdic.gov/resources/deposit-insurance/brochures/documents/your-insured-deposits-english.pdf).”
>      
> 19.  Federal Deposit Insurance Corp. “[FDIC Acts To Protect All Depositors of the former Silicon Valley Bank, Santa Clara, California](https://www.fdic.gov/news/press-releases/2023/pr23019.html).”
>      
> 20.  Federal Deposit Insurance Corp. “[Deposit Insurance Fund](https://www.fdic.gov/resources/deposit-insurance/deposit-insurance-fund/).”
>      
> 21.  Federal Reserve Bank of New York. “[Why Did FDR’s Bank Holiday Succeed?](https://www.newyorkfed.org/research/epr/09v15n1/0907silb.html)”