Decision IntelWashington Mutual
Washington Mutual Bank Failure
Estimated impact: $307B in assets seized
WaMu became the largest bank failure in U.S. history with $307B in assets. The thrift aggressively expanded into subprime and option-ARM mortgages, with loan officers incentivized on volume rather than quality. Internal risk reports were systematically ignored by senior leadership.
Decision context
Whether to continue originating high-risk mortgage products as housing prices peaked and delinquency rates began rising in 2006-2007.
What the company’s own filing already carried
Not our reading of a memo. Washington Mutual's own 10-K, filed 2007-03-01 (10 months before the 2008 decision), was read by the audit engine's deterministic structural layer: the same detectors that run on every audit, with no language model involved. Everything below is drawn from the company's own disclosure, before any knowledge of what followed, and never from the decision itself.
Survivable as structured: if the flagged risk fires, the deal has the exits, cushions, or staging to absorb the hit and continue.
The structural layer flagged no unabsorbed condition in this filing.
- This reads the company's own 10-K (filed 10 months before the decision), not the decision memo itself, so it can only understate what a full audit of the memo would surface.
- It reads the structure of the situation, not the trigger: whether a shock to the flagged conditions would be absorbed, never that a shock arrives.
- A reading of a dated filing, not a prediction: every condition can be checked against the company's own 10-K.
Decision anatomy
Red = risk factor present · Green = protective factor present
Biases present in the decision
★ Primary driver · Severity estimated from bias type and decision outcome
Toxic combinations
The curated library this case sits in
Across all 155 curated case studies in our library, by documented outcome:
The library is curated toward documented failures, so this split describes the library, not the base rate of deals. The case above is one row in it.
Lessons learned
- Recency bias from years of rising home prices created false confidence in perpetual appreciation
- Incentive structures rewarding loan volume over quality systematically degrade underwriting standards
- When risk officers are overruled by revenue-generating divisions, the institution has no effective risk management
Source: FDIC OIG Material Loss Review, Report No. MLR-10-007 (2010) (Case Study)
These patterns were flaggable in Washington Mutual's own record — before the outcome.
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Workflows that fire on decisions like Washington Mutual’s
The same Recognition-Rigor Framework that documents this case audits memos in the same shape — before the outcome forces the lesson.