Current account sees $2.8 bln gap in December
Official data showed that the figure widened by $1.7 billion from same month the previous year.
The country's 12-month rolling surplus totaled $1.67 billion, the bank said.
An Anadolu Agency survey showed that economists had projected the current account balance to post a $3 billion deficit in the month.
The estimates of a group of 14 economists ranged between $2.6 billion and $3.3 billion
The survey also found Turkey's current account balance is projected to post a $1.2 billion surplus in 2019.