NEW YORK (

TheStreet

) -- European bank stocks were mixed after Eurozone leaders agreed that the European Central Bank would begin regulating many of the continent's most important banks, beginning in March.

European finance ministers agreed early on Thursday on a Single Supervisory Mechanism (SSM), under which the European Central Bank would begin its supervisory role in March, with national parliaments deciding on whether or not to submit the new unified bank regulator.

ECB president Mario Draghi said in a statement that unanimous agreement among members of the European Union's Economic and Financial Affairs Council marked "an important step towards a stable economic and monetary union, and towards further European integration." The agreement will also pave the way for eurozone nations to bail out troubled banks.

German chancellor Angela Merkel said before the Bundestag on Thursday that the significance of the agreement for the SSM "could not possibly be overestimated," according to a

Deutsche Welle

report.

Merkel also said she was looking for further agreements before the end of the European Leaders' summit in Brussels on Friday, including "concrete measures today and tomorrow that focus on how we can achieve this increase in competitiveness."

European bank stocks were mixed in U.S. trading. German bank stocks were lower, including

Deutsche Bank

(DB) - Get Deutsche Bank AG Report

, which was down over 2% in midday trading, to $43.66, while American depositary receipts of

Commerzbank AG

(CRZBY)

were down 2% to $1.85

Meanwhile, shares of

UBS

(UBS) - Get UBS Group AG Report

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were down slightly, $16.33, while

Credit Suisse

(CS) - Get Credit Suisse Group AG Sponsored ADR Report

was up 1% to $24.78,

BNP Paribas

was up slightly to $43.22, and

HSBC

(HBC)

was up slightly to $51.96.

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--

Written by Philip van Doorn in Jupiter, Fla.

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Philip W. van Doorn is a member of TheStreet's banking and finance team, commenting on industry and regulatory trends. He previously served as the senior analyst for TheStreet.com Ratings, responsible for assigning financial strength ratings to banks and savings and loan institutions. Mr. van Doorn previously served as a loan operations officer at Riverside National Bank in Fort Pierce, Fla., and as a credit analyst at the Federal Home Loan Bank of New York, where he monitored banks in New York, New Jersey and Puerto Rico. Mr. van Doorn has additional experience in the mutual fund and computer software industries. He holds a bachelor of science in business administration from Long Island University.