S&T Bancorp Inc. in Indiana, Pa., said Monday that it swung to a $10.2 million loss in the second quarter, from a $13.9 million profit a year earlier, mostly because chargeoffs spiked to $34.6 million, or 3.91% of average loans.

Its loss of 37 cents a share took analysts by surprise. On average they had expected the $4.2 billion-asset S&T to earn 16 cents a share for the quarter, according to Thomson Reuters.

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