WASHINGTON — When the government removed Scott Polakoff as the acting director of the Office of Thrift Supervision last week, it said he was being investigated for "August 2008 actions related to post-period capital contributions."

The explanation was not exactly transparent, but sources said Friday that Polakoff is being accused of allowing BankUnited of Coral Gables, Fla., to overstate its capital. Specifically the charge is that the regulator let the $14 billion-asset thrift tell the public that it had raised capital before it had actually done so.

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