What Is a Bank Run? Northern Rock, SVB and the Bail-in

A bank run is when many depositors try to take their money out at once because they fear the bank will fail. Banks keep only a fraction of deposits as cash and reserves, so a run can bring down even a bank that is sound on paper. In the words of the 2022 Nobel prize announcement, a rumour can become “a self-fulfilling prophecy”.

Runs are the reason deposit insurance, central bank lending and bail-in laws exist, and the reason self-custody matters to anyone who holds bitcoin.

Why do bank runs happen?

A bank's promises and its assets run on different clocks. Deposits can be withdrawn at any moment, while loans are repaid over years. On a normal day only a few depositors want cash, and the bank pays them. If everyone asks on the same day, it cannot, however good its loans are.

So confidence is the central issue. Once people believe others will withdraw, withdrawing first is the sensible thing to do, and the rumour makes itself true. Douglas Diamond and Philip Dybvig, who shared the 2022 prize, showed that the spiral can be stopped by the state providing deposit insurance and acting as lender of last resort (Nobel Prize).

Fractional reserve banking: how banks really create money →

How fiat money is actually created →

Northern Rock: the first British bank run since Victorian times

Northern Rock grew fast on borrowed money. Between 1997 and 2006 its assets rose from £15.8 billion to £101.0 billion, while retail deposits fell from 62.7% to 22.4% of its funding. Most of the rest came from wholesale markets and from selling packages of its mortgages to investors (Treasury Committee). On 9 August 2007 those markets seized up, in a global shock centred on American sub-prime mortgages.

On the evening of 13 September 2007, news broke that it had asked the Bank of England for help. Early the next morning the Bank announced an emergency liquidity facility, and the Financial Services Authority said Northern Rock was solvent and exceeded its capital requirement (Treasury Committee). Depositors ran anyway.

Most withdrawals were made online, by phone or by post, but the queues outside its 72 branches became the picture of the crisis. Deposit protection at the time covered 100% of the first £2,000 and 90% of the next £33,000, so a saver with £35,000 could get back at most £31,700. The Governor of the Bank of England told MPs “there is no point having 90%, because that will not stop the bank run”.

The run stopped only when the Chancellor announced on 17 September 2007 that the government would guarantee all existing deposits. Northern Rock passed into public ownership on 22 February 2008 (Transfer Order). The Treasury Committee blamed its directors for “a reckless business model” that relied too heavily on wholesale funding.

Cyprus: when depositors paid for the rescue

By March 2013 Cyprus needed a euro-area rescue, and its largest banks were short of about €10 billion of capital, over 50% of the country's GDP. The first plan, agreed on 16 March, included a one-off levy on all depositors, insured and uninsured alike (European Commission). The Cypriot parliament rejected it, and the banks stayed shut until 28 March for fear of a run. At one of them, Laiki, cash machines paid out at most €260 a day.

The deal reached on 25 March protected every deposit under €100,000, and none of the rescue loans, up to €10 billion, could be used to recapitalise the banks (Eurogroup). Larger deposits paid instead. Laiki was split up: its insured deposits moved to Bank of Cyprus, and the losses stayed behind with its shareholders, bondholders and uninsured depositors. Bank of Cyprus was recapitalised by turning uninsured deposits into shares; in the end, 47.5% of uninsured deposits above €100,000 were converted. Capital controls followed, to stop money leaving the country.

Silicon Valley Bank: over $40 billion in one day

Silicon Valley Bank grew from $71 billion to over $211 billion in assets between 2019 and 2021, mostly on deposits from technology firms and their venture-capital backers. By the end of 2022, about 94% of its deposits were uninsured. It had put much of the money into longer-term bonds, which lost value as interest rates rose (Federal Reserve).

On 8 March 2023 it said it had sold $21 billion of securities at a $1.8 billion loss after tax and was seeking to raise capital. The next day depositors pulled over $40 billion, and the bank expected over $100 billion more on 10 March: together, roughly 85% of its deposits. By the Fed's comparison, Washington Mutual lost $19 billion over 16 days in 2008. California's regulator closed the bank on the morning of 10 March.

Capital rules did not save it. On the regulatory measure, its common equity ratio of 12% was above its peers' 10%. The Fed's review says the run was fuelled by social media and moved at an unprecedented rate.

Then the backstops arrived, wider than the rules had promised. On 12 March 2023 the Treasury, the Fed and the FDIC said every depositor would be protected, insured or not, with any loss to the deposit insurance fund recovered through a special charge on banks (joint statement). The Fed also offered banks loans of up to one year against Treasury and other high-quality bonds “valued at par”: at their face value, not their fallen market price.

How deposit insurance works

Deposit insurance promises that if a bank fails, its depositors are repaid up to a limit. The limits today:

United States: $250,000 per depositor, per bank, for each account ownership category (FDIC).
United Kingdom: £120,000 per person, per bank, building society or credit union, since 1 December 2025, up from £85,000 set in 2017 (PRA). Temporary high balances, such as the proceeds of a house sale, are covered up to £1.4 million for six months (FSCS).
European Union: €100,000 per depositor, per bank (EU directive).

Full cover up to a limit gives small savers no reason to run; Northern Rock showed that partial cover does not. Above the limit, a depositor is simply a creditor of the bank, which is why Silicon Valley Bank, with almost all its deposits uninsured, lost them so fast.

What is a bail-in?

A bail-in makes a failing bank's own investors and creditors absorb its losses, by cutting what they are owed or converting it into shares, instead of a government bail-out with public money. Cyprus did it under a newly passed national law.

Then the EU's Bank Recovery and Resolution Directive of 15 May 2014 gave every member state a bail-in tool, to apply from 1 January 2016 at the latest. Insured deposits are excluded. Before a resolution fund can put money in, shareholders and creditors must already have absorbed losses of at least 8% of the bank's total liabilities, including its own funds (BRRD). Deposits of individuals and small firms above the insured limit rank ahead of ordinary unsecured creditors: near the back of the queue for losses, but not exempt.

In the UK, the Banking Act 2009 has included a bail-in option since 31 December 2014. The Bank of England is the authority that can use it, and protected deposits are excluded (legislation.gov.uk). In the US, the FDIC's first plan for Silicon Valley Bank was the standard one: insured deposits paid in full, and uninsured depositors given a receivership certificate, to be paid what the sale of the bank's assets allowed (FDIC). The emergency decision of 12 March replaced it.

Bank runs, self-custody and bitcoin

A bank deposit is a promise to pay, and a promise can be delayed, frozen or converted, as depositors in Cyprus found. Bitcoin held in your own wallet is not anyone's promise. No bank holds it, so no bank can fail with it, and no authority can bail it in.

Be clear about the limits. Bitcoin held on an exchange is a deposit by another name, a promise from the firm: when FTX collapsed, a US court's order noted that “customer funds were commingled and misappropriated”. And self-custody has no lender of last resort either. Lose your keys, and no one can restore them.

That is why the arrangement The Bitcoin Transition recommends for savings is a multi-signature wallet: several keys, generated on devices from unrelated makers and kept in different places, so that no single loss, theft or failure can take the coins. Keep a copy of the wallet's configuration with each key, because the keys alone may not be enough to recover it. It takes more care than a bank account, and if that is more than you can keep up, it should change how much you hold this way.

Why self-custody is not optional →

How to set up a multisig bitcoin wallet →

Questions people ask

What is the central issue that causes bank runs and panics?

Confidence, combined with a mismatch: deposits can be withdrawn on demand, while the bank's loans are repaid over years. Once depositors fear that others will withdraw, it is rational to withdraw first, and the fear can make itself true.

What is fractional reserve banking?

A system in which banks keep only a fraction of their deposits as cash and reserves, which is why no bank can repay all its depositors at once. In the US the required fraction has been zero since March 2020.

Is my money safe in a bank?

Up to the insurance limit, it is protected: $250,000 in the US, £120,000 in the UK and €100,000 in the EU, per bank. Above it, you are a creditor of the bank, and in a bail-in that money can be cut or turned into shares, as 47.5% of uninsured deposits at Bank of Cyprus were.

What is the difference between a bail-out and a bail-in?

In a bail-out, the government puts in public money. In a bail-in, the bank's shareholders and creditors take the losses, their claims cut or turned into shares. Northern Rock was bailed out; Bank of Cyprus was bailed in.

Can there be a run on bitcoin?

Not on bitcoin you hold yourself: there is no institution between you and the coins. On an exchange or lender that holds bitcoin for its customers, yes, because their balances are promises the firm may not be able to keep.

Money 101: the reading list →

Sources

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The Bitcoin Transition

The Bitcoin Transition is a free, non-commercial educational project. We publish from first principles, in the voice of the protocol itself: direct, technically precise, and free from fiat-denominated framing.