Egyptian investment bank EFG-Hermes plunged to a net loss last year, hit by one-off charges including a writedown in the value of certain investments.

The bank, active both in investment and commercial banking, said on Thursday it made a net loss of LE335 million ($48 million), compared with a profit of LE211 million in 2012. Excluding the charges, normalised net profit doubled from 2012, it said.

EFG-Hermes said the one-off charges totalled LE761 million, including LE616 million in the fourth quarter alone.

Hanzada Nessim, head of investor relations, told Reuters in an email that the impairment charges related to acquisitions which the bank had previously made at home and in markets such as Kuwait and Oman.

Charges also related to changes in the "fair value" of investment property in Dubai and one-off operating expenses booked during the year, Nessim said, without giving any further detail.

In the fourth quarter, EFG-Hermes made a net operating profit of LE163 million, up 302 percent from a year earlier, the bank said.

Its normalised net profit, discounting one-off charges, reached LE427 million for the whole year, slightly more than double the amount it made in 2012.

EFG-Hermes shares dropped 6.8 percent to trade at LE12.40 by 1137 GMT. Last week they hit their highest since mid-2012 at around LE13.50.