WASHINGTON (AP) -- Regulators on Friday shut down three banks in Florida and one each in Nevada and California, bringing the number of U.S. bank failures this year to 78.

The three Florida closures brought to 13 the number of bank failures this year in Florida, a state with one of the highest concentrations of bank collapses and where the meltdown in the real estate market brought an avalanche of soured mortgage loans. Fourteen banks in the state failed last year.

California is another state with a heavy concentration of bank failures, and Granite Community Bank was the sixth bank to fall in the state this year, following the shutdown of several big California banks in the last months of 2009. Seventeen banks failed in California last year.

Georgia and Illinois also are high on the list of states with concentrated bank failures.

With 78 closures nationwide so far this year, the pace of bank failures is more than double that of 2009, which was already a brisk year for shutdowns. By this time last year, regulators had closed 36 banks. The pace has accelerated as banks' losses mount on loans made for commercial property and development.

The number of bank failures is expected to peak this year and to be slightly higher than the 140 that fell in 2009. That was the highest annual tally since 1992, at the height of the savings and loan crisis. The 2009 failures cost the insurance fund more than $30 billion. Twenty-five banks failed in 2008, the year the financial crisis struck with force, and only three succumbed in 2007.

As losses have mounted on loans made for commercial property and development, the growing bank failures have sapped billions of dollars out of the deposit insurance fund. It fell into the red last year, and its deficit stood at $20.7 billion as of March 31.

The FDIC expects the cost of resolving failed banks to grow to about $100 billion over the next four years.

The agency mandated last year that banks prepay about $45 billion in premiums, for 2010 through 2012, to replenish the insurance fund.

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