Do Banks Have Enough Capital? | Dr. Martien Lubberink

Episode Summary

Executive Summary: The episode explains what bank regulatory capital is, why it matters, and why capital alone does not prevent bank failures. Martin Luberink argues that SVB failed because of extreme duration mismatch, poor governance, and a depositor run that forced losses to be realized; Credit Suisse exposed weaknesses in resolution and AT1 treatment; and New Zealand’s system is comparatively resilient due to high capital, hedging, and supervision, though profitability and housing credit risk remain concerns.

Main Topics: What bank regulatory capital is (Priority: 5/5): Capital is the equity cushion that absorbs losses between assets and liabilities. The discussion distinguishes common equity tier one, leverage ratios, tier one, and tier two capital, emphasizing that capital is a loss-absorbing buffer rather than a complete safeguard. Why Silicon Valley Bank failed (Priority: 5/5): SVB is presented as a textbook case of duration mismatch, inadequate hedging, concentrated deposits, and hidden interest-rate losses on held-to-maturity securities that became real once depositors ran. Limits of capital and importance of liquidity/operational risk (Priority: 5/5): The guest argues that higher capital requirements reduce fragility but cannot stop a bank run or substitute for liquidity management, governance, diversification, and operational controls. Credit Suisse and AT1 bonds (Priority: 4/5): The conversation explains AT1 instruments as hybrid loss-absorbing capital, why they were attractive to banks, and why the Credit Suisse wipeout shocked markets when AT1 holders were hit before equity expectations were clearly settled. New Zealand banking system and Reserve Bank policy (Priority: 4/5): New Zealand banks are described as highly capitalized, heavily supervised, and generally hedged against interest-rate risk, but rising rates may squeeze margins, pressure households, and increase credit risk in housing. Risk weights, Basel rules, and regulatory gaps (Priority: 4/5): The interview covers risk-weighted assets, CET1 ratios, pillar one versus pillar two, and how regulatory risk weights can diverge from true economic risk, especially with sovereigns and structured products. U.S. regional banks and regulatory asymmetry (Priority: 4/5): The guest notes that U.S. Basel III compliance mainly covers large international banks, while many smaller regional banks remain on older standards despite large commercial real estate exposure.

Key Arguments: Bank capital is equity designed to absorb losses, but it cannot by itself prevent failures caused by runs or severe liquidity shocks. SVB’s problem was not primarily credit risk; it was interest-rate risk, duration mismatch, and a run that forced unrealized losses to become realized. Accounting treatment of held-to-maturity securities can hide losses until the bank is forced to sell assets. Hedging transfers interest-rate risk off balance sheet, often to CCPs, pension funds, or other counterparties, but the hedge is never perfect. Operational risk—fraud, governance failures, mismanagement, AML issues—is still under-regulated and harder to model than credit or market risk. New Zealand banks are safer than many peers because they hold high capital, face stricter mortgage stress testing, and generally hedge interest-rate exposure. Credit Suisse showed that legal structure and resolution mechanics matter: investors’ expectations about the hierarchy between equity and AT1 were not aligned with what regulators did. Basel III improved global bank resilience, but the U.S. has left many small banks outside the strongest parts of the framework, creating residual vulnerability. A bank with concentrated funding and concentrated assets is fragile even if it appears well capitalized on paper.

Data Points: Leverage before GFC: 30:1 to 40:1 - Referenced as the leverage level of banks like Bear Stearns/Lehman before the 2008 crisis. Current bank leverage: Around 10:1 - Used to illustrate that banks are now much less levered due to post-crisis rules. SVB deposit growth: Tripled in a little over a year / maybe two years - Described as a key reason the bank had to deploy funds into long-duration securities. New Zealand bank capital target: Close to 20% - Guest says NZ banks are moving toward very high capital ratios. Traditional Basel requirement in NZ: Around 10% - Starting point before the higher capital phase-in. Common equity tier one requirement: About 7% - Cited as a typical pillar-one CET1 requirement. Risk weight on cash: 0% - Example of a zero-risk-weight asset in the standardized framework. Risk weight on SME loans: 100% - Used as an example of a relatively high-risk-weight category. Risk weight on NZ residential mortgages: About 35% - Illustrates why banks prefer mortgage lending in that market. Pillar two add-on: 50 to 100 basis points - Example of extra supervisor-imposed capital above formal minimums. AT1 wipeout at Credit Suisse: About $17 billion - The amount of additional tier one capital that was written off. New Zealand OCR move: 50 basis points - The Reserve Bank of New Zealand hike mentioned by the host. U.S. bank asset threshold: $250 billion - Referenced in the discussion of lighter regulation for smaller banks after Trump-era changes. Mortgage stress test rate in NZ: 8% - Banks stress mortgage borrowers at this level before lending. New Zealand bank ROE: About 12% - Used to suggest profitability remains relatively strong.

Pivotal Quotes: "capital is not the end of it. It's not everything." — Martin Luberink: Explaining why SVB and Credit Suisse show that high capital alone cannot stop a bank from failing. "there's a limit to what bank capital can protect a bank." — Martin Luberink: On the inability of capital to absorb the consequences of a sudden depositor run and forced asset sales. "What could possibly go wrong?" — Martin Luberink: A sarcastic remark about the incentives behind AT1 bonds, which offer tax benefits and loss-absorbing features but can create resolution problems.

Implications: The episode suggests regulators may focus more on liquidity, deposit stickiness, and operational risk than on capital alone. For banks, concentration, hedging, and governance matter as much as ratios; for investors, the fine print on resolution and hybrid capital is crucial.