WASHINGTON — Bank holding companies that need an additional capital buffer will have until June 8 to develop a detailed capital plan, and until Nov. 9 to implement the plan, federal regulators said Wednesday.

In a joint release offering more details on the stress tests regulators conducted at the 19 largest banks, the regulators said in order to pass the test, each bank holding company had to achieve a Tier 1 risk-based capital ratio of at least 6%, and a common risk-based ratio of at least 4%, by the end of 2010.

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