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Stockholders' equity - Statutory reserve - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stockholders Equity Note      
Puerto Rico Laws Restrictions on Banks Net Income a minimum of 10% of BPPR’s net income    
Statutory reserve balance $ 659,000 $ 599,000 $ 540,000
Transfer to statutory reserve 0 0 0
Capital surplus      
Stockholders Equity Note      
Transfer to statutory reserve $ 60,111 $ 58,340 $ 27,135