Shares in FirstFed Financial Corp. dipped more than 8 percent Tuesday after the regional bank holding company said it was forced to raise its bad-loan provision fivefold in the latest quarter because of a spike in delinquencies.

FirstFed, the parent of First Federal Bank of California, said it expects to set aside $20 million to $23 million in its fourth quarter to cover bad loans. The provision was $4.5 million in the third quarter.

The value of delinquent, single-family loans in the quarter rose 116 percent to $180 million by the end of September. It attributed some of the rise to the resetting of adjustable-rate mortgages to the “maximum allowable negative amortization,” which requires homeowners to increase monthly payments.

Shares in FirstFed dropped 8.5 percent to $32.18 Tuesday in trading on the New York Stock Exchange.