Lionel Laurent is a Bloomberg Gadfly columnist covering finance and markets. He previously worked at Reuters and Forbes.

(Updated )

Just a month ago, Credit Suisse CEO Tidjane Thiam and Deutsche Bank CEO John Cryan risked, as one hedge fund manager put it, becoming the dead men walking of European banking as they struggled to shore up their firms' profitability.

A Turning Point?
Shares of both Credit Suisse and Deutsche Bank have had a dismal start to the year
Source: Bloomberg

Thursday's results from Credit Suisse suggest Thiam may escape that fate while Cryan's effort to revamp the German lender stalls. After a first-quarter loss, the Swiss bank posted a better-than-anticipated profit in the second quarter.

Surprise Profit
Credit Suisse has rebounded from its fourth-quarter loss
Source: Bloomberg

Thiam is cutting the lender's reliance on investment banking and expanding its wealth management operation. The plan is starting to deliver positive results: even as revenue tumbled by 27 percent, operating expenses fell to the lowest in more than two years and the lender's core capital ratio increased.

Back on Track
Credit Suisse's revenue has fallen -- and operating expenses are showing signs of following
Source: Company reports

That discipline is precisely what investors want in an industry faced with anemic economic growth, low interest rates and regulatory curbs on risk-taking.

But it's too early to celebrate, something Thiam himself recognizes. He pointed to the fallout from the U.K.'s vote to leave the European Union and the U.S. presidential election in November. Thiam can't control market gyrations -- but they will be decisive in determining the success of his plan.

A big part of Thiam's mission involves shrinking assets, especially in the securities trading business. Credit Suisse's so-called bad bank wants to reduce risk-weighted assets to 45 billion Swiss francs this year and 37 billion francs in 2017. This looks achievable -- so far this year, the division has cut RWAs to 58 billion francs from 73 billion francs -- but the task will become much harder if markets worsen.

Not-So-Bad Bank
Credit Suisse has slashed unwanted assets -- but its bad bank has more to do to meet targets
Source: Company reports

There's also the question of how quickly Thiam is able to grow Credit Suisse's wealth management business, seen as a more reliable and less capital-intensive income stream than investment banking.

It's encouraging that net new assets in the first half increased by 60 percent without gross margins being hit. But we've seen recent corrections in emerging markets take a toll on client flows -- the last three months of 2015 saw private-banking outflows in Switzerland and abroad. The number of freshly minted millionaires is stalling and rival private banks are intensifying their push in Asia. Bernstein analysts expect Credit Suisse private banking assets to decline in 2017.

While Credit Suisse has shown it can juggle a restructuring with boosting capital, Commerzbank's announcement this week is a reminder that these ratios can be volatile, too. The German lender's ratio fell as regulators forced the bank to apply a stiffer risk-weighing against some assets to reflect the greater operational risk they carry. It also blamed increased pension liabilities. Both these things are beyond the control of management.

Thiam deserves credit for sticking to his strategy. But with two years of restructuring ahead, and market sentiment changing on a centime, it pays to stay cautious.

This column does not necessarily reflect the opinion of Bloomberg LP and its owners.

(Corrects to show 37 billion-franc target is for 2017 in sixth paragraph.)

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Lionel Laurent in London at

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