BankUnited Financial Corp.'s regulator would probably downgrade the company's capital rating if it is unable to raise $400 million of capital, the company has said.

The Coral Gables, Fla., company said in a Securities and Exchange Commission filing late Monday that it is considered well-capitalized, but it said it expects the Office of Thrift Supervision to reclassify it as adequately capitalized if it fails to raise more capital.

The $14.3 billion-asset BankUnited, which has lost $93.1 million in the last two quarters, disclosed its need for more capital in May. It has not said how much it has raised to date.

BankUnited also said in the Monday filing that Fitch Ratings downgraded its long-term and senior debt to BB-minus, from BB, and its individual rating from C/D to D.

The company said the downgrading could make capital-raising more difficult.

BankUnited's shares fell 10.1% Tuesday, to close at $1.43.

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