(Reuters) - U.S. bank regulators closed four banks in as many states on Friday, bringing the number of failures so far this year to 26 as deteriorating loans continued taking a toll on financial institutions.

The FDIC estimates that the cost to the Deposit Insurance Fund (DIF) will be $38.1 million. Home Bank's acquisition of all the deposits was the "least costly" resolution for the FDIC's DIF compared to all alternatives. Statewide Bank is the 30th FDIC-insured institution to fail in the nation this year, and the first in Louisiana. The last FDIC-insured institution closed in the state was The Farmers Bank & Trust of Cheneyville, Cheneyville, December 17, 2002.

The FDIC estimates that the cost to the Deposit Insurance Fund (DIF) will be $94.6 million. Centennial Bank's acquisition of all the deposits was the "least costly" resolution for the FDIC's DIF compared to all alternatives. Old Southern Bank is the 29th FDIC-insured institution to fail in the nation this year, and the fourth in Florida. The last FDIC-insured institution closed in the state was Marco Community Bank, Marco Island, February 19, 2010.

As part of this transaction, the FDIC will acquire a cash appreciation instrument. The FDIC estimates that the cost to the Deposit Insurance Fund (DIF) will be $50.7 million. Valley National Bank's acquisition of all the deposits was the "least costly" resolution for the FDIC's DIF compared to all alternatives. The Park Avenue Bank is the 28th FDIC-insured institution to fail in the nation this year, and the second in New York. The last FDIC-insured institution closed in the state was LibertyPointe Bank, New, York, New York, on March 11, 2010.

The FDIC estimates that the cost to the Deposit Insurance Fund (DIF) will be $24.8 million. Valley National Bank's acquisition of all the deposits was the "least costly" resolution for the FDIC's DIF compared to all alternatives. LibertyPointe Bank is the 27th FDIC-insured institution to fail in the nation this year, and the first in New York. The last FDIC-insured institution closed in the state was Waterford Village Bank, Williamsville, July 24, 2009.