The Federal Reserve on Thursday announced written agreements with four banks, including the $2 billion-asset Old Second Bancorp Inc. in Aurora, Ill.

All four banks were barred from paying dividends or paying interest and principal on subordinated debt and trust preferred securities without Fed approval.

Old Second agreed to serve as a source of strength to Old Second National Bank, which has been operating under a consent order from the Office of the Comptroller of the Currency since May 16. The company was also required to provide the Fed with "an acceptable written plan to maintain sufficient capital."

Bankwest Financial Inc. in Rockford, Minn., agreed to serve as a source of strength to its $113.2 million-asset Bankwest, which has been operating under a consent order from the Federal Deposit Insurance Corp. and its state banking regulator since March 17.

Naples Bancorp Inc. in Florida agreed to serve as a source of strength to its $187.4 million-asset Bank of Naples, which has been operating under a consent order from the FDIC and its state banking regulator since March 8.

Finally, Plumas Bancorp in Quincy, Calif., agreed to be a source of strength to its $468.8 million-asset Plumas Bank, which has been operating under a consent order from the FDIC and its state banking regulator since March 18. The company must supply regulators with cash flow projections for 2011.

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