By Jeannette Neumann and Christopher Bjork 

MADRID-- Banco de Sabadell SA's bid for TSB Banking Group PLC reflects a maxim of postcrisis banking in Spain: Diversify abroad.

The profitability of Spanish banks such as Sabadell, the country's No. 5 lender by market value, was hit hard when a real estate boom went bust in 2008. Property developers defaulted on tens of thousands of loans, saddling banks with bad debts that they are working through today.

Spanish banks with large international operations such as Banco Santander SA and Banco Bilbao Vizcaya Argentaria SA, however, had units from the U.K. to Latin America and fared better than others during the downturn, buoyed by returns in stronger markets overseas.

Consequently, executives from small- and medium-size banks that are primarily focused on the home market vowed in the aftermath of the crisis to look beyond Spain's borders.

In that sense, Sabadell's move is the boldest yet by a Spanish midsize bank. Both Sabadell and TSB on Thursday confirmed they are in talks about a possible 1.7 billion-pound ($2.54 billion) takeover, in what would be one of the largest European cross-border banking acquisitions in years.

Still, some analysts said the proposed offer was too ambitious. Shares in Sabadell closed down 6.64% in Madrid on Thursday.

Sabadell purchased six lenders in Spain between 2006 and 2014, and it is digesting financial-crisis era acquisitions, such as troubled regional savings bank Caja de Ahorros del Mediterráneo, which it purchased in 2011 for 1 euro ($1.06).

TSB said Sabadell had indicated it expects to finance the proposed takeover on a capital-neutral basis. Francisco Riquel, an analyst with Madrid-based financial-services firm N+1 Group, said Sabadell is likely to need around EUR1.2 billion in capital to fund the deal.

A rights issue at a 30% discount to its current stock price would require Sabadell to increase its shares outstanding by about 20%, diluting current shareholders, Mr. Riquel said in a research note on Thursday.

Sabadell has long affirmed its aim to expand internationally. But Mr. Riquel said, "We thought this was a long-term strategic ambition."

"We would have preferred Sabadell to deploy its excess capital in its Spanish market [organically or through acquisitions] now that [economic] growth is gathering pace," he said.

In an interview with The Wall Street Journal last year, Sabadell Chairman Josep Oliu said a lesson learned in Spain's financial crisis was that it was necessary for the bank to build an international presence. Mr. Oliu has been chairman since 1999 and has a Ph.D. in economics from the University of Minnesota. Chief Executive Jaime Guardiola also has international experience, after running BBVA's Mexican unit.

Berenberg Bank analyst Nick Anderson said the takeover talks with TSB raised questions about Sabadell's confidence in its home market. "By bidding for TSB, they're saying their marginal euro is best invested in a mature market at the top of cycle [U.K.] rather than a supposedly recovering economy at [the] start of [a] cyclical rebound [Spain]," Mr. Anderson said.

Sabadell already owns Miami-based Sabadell United Bank and corporate lending operations in Mexico, but the bank said this week it was eager to increase the proportion of annual net profit generated abroad to 30% from around 8% now. It didn't say when it aimed to hit that figure.

Sabadell has said it expects to get its full banking license in Mexico this summer and that it would focus on loans to small- and medium-size businesses.

The TSB takeover talks come as another Spanish lender, Caixabank SA, is trying to expand in neighboring Portugal. Caixabank, Spain's No. 3 bank by market value, last month offered to buy the 55.9% of Banco BPI SA that it doesn't already own. The takeover bid has been muddled as a top shareholder has suggested BPI instead merge with another Portuguese bank.

Write to Jeannette Neumann at jeannette.neumann@wsj.com and Christopher Bjork at christopher.bjork@wsj.com

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