WASHINGTON - The Office of the Comptroller of the Currency should have been more aggressive in its supervision of First National Bank of Keystone, which failed last year at an estimated cost to the Bank Insurance Fund of $750 to $850 million, according to a report issued Monday by the Treasury Department.

"The supervisory history of Keystone points to a potential fundamental weakness in the OCC's examination process," the Treasury's Office of the Inspector General found.

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