QNB, which is 50-percent owned by sovereign wealth fund Qatar Investment Authority, in 2016 completed the acquisition of Turkey's Finansbank. Now around 15 percent of QNB's assets and 14 percent of its loans relate to Turkey, according to Arqaam Capital.

The lira has come under pressure this year as a result of investor concerns about President Tayyip Erdogan's influence on monetary policy and an ongoing row with the United States that has resulted in reciprocal sanctions and trade restrictions.

QNB's net profit rose to 3.72 billion riyals ($1.02 billion) in the three months to Sept 30 from 3.60 billion a year earlier, it said.

SICO Bahrain forecast the bank would make a net profit of 3.72 billion riyals, while EFG Hermes expected a net profit of 3.64 billion.

Net interest income grew to 4.72 billion riyals from 4.63 billion riyals in the same period of last year. That helped offset a slight dip in net fees and commission income to 839.2 million riyals, down from 935.1 million riyals in the year earlier period.

The bank aims to increase its profit by 5 to 8 percent this year and loans and investments by 10 to 12 percent, helped by expansion into faster-growing Southeast Asia markets, its chief executive told Reuters in April.

Despite the devaluation impact from the lira, the bank said its loan to deposit ratio rose to 98.3 percent by Sept. 30.

QNB also reported a doubling in net impairment losses on loans and advances to customers to 684.0 million riyals, up from 338.6 million riyals in the same period of last year.