SAN FRANCISCO (MarketWatch) -- A flurry of subsidiary closures in Georgia and a failure in New York state on Friday brought the U.S. tally of shuttered banks to 64 for the year, as the credit crunch continues to overwhelm financial institutions.

Six subsidiaries of Macon, Ga.-based Security Bank Corp. were closed by regulators, the Federal Deposit Insurance Corp. said in a statement, collectively triggering an $807 million dent in the federal deposit-insurance fund.