Russia's biggest bank reported a record-breaking profit of 117.7 billion rubles ($1.8 billion) over January-March, nearly four times more than in the same period last year.
The bumper earnings at Sberbank, which is state-owned and subject to Western sanctions, signal that Russia's economy has sharply improved since a year ago, when the sanctions over the Ukraine crisis and falling oil prices caused financial turmoil.
The country is still in a recession that began at the end of 2014.
Sberbank said in a statement on Wednesday its margins on lending rose, while its cost of risk and provisions for bad debt had fallen sharply from a year ago.
Analysts had forecast profits according to international financial reporting standards of just over 100 billion rubles.