Summary Box: Bank insurance fund down 20 percent

DWINDLING INSURANCE FUND: The Federal Deposit Insurance Corp. says the fund that guarantees bank deposits (up to $250,000 for regular accounts) dropped 20 percent in the second quarter to $10.4 billion, its lowest point since 1992.

WHAT’S BEHIND IT?: U.S. banks lost $3.7 billion in the second quarter and a cascade of failures has sapped billions from the insurance fund. Eighty-one banks have been closed by regulators so far this year. Hundreds more are expected to collapse in coming years largely because of soured loans for commercial real estate.

WHAT’S BEING DONE?: The FDIC has been increasing the fees it collects from U.S. banks to replenish the fund. The FDIC has authority to borrow up to $500 billion from the U.S. Treasury. The agency’s chairman didn’t rule that out, but says there are no immediate plans to tap it.