Discover Financial Services (DFS) reported a 7 percent fall in quarterly profit that narrowly missed Wall Street estimates as the credit card company put aside more money to cover defaults.
Discover shares fell more than 5 percent in extended trading.
The payment processing network set aside $333 million to cover future bad debt, up from $136 million a year earlier.
Credit card loans rose 4 percent to $50.4 billion in the quarter ending Sept. 30. Delinquencies over 30 days fell to 1.67 percent from 1.83 percent.
Net profit fell to $593 million, or $1.20 per share, in the third quarter, from $637 million, or $1.24 per share.
Revenue, net of interest expense, increased 3 percent to $2.06 billion.
Analysts on average had expected earnings of $1.21 per share on revenue of $2.07 billion, according to Thomson Reuters I/B/E/S.
The company's shares, which have risen about 7 percent this month, fell to $51.06 in trading after the bell after closing at $53.74 on the New York Stock Exchange.
(Reporting by Aman Shah in Bangalore; Editing by Don Sebastian, Maju Samuel)