Stockholders' equity - Statutory reserve - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Stockholders Equity Note
Puerto Rico Laws Restrictions on Banks Net Income	a minimum of 10% of BPPR’s net income
Statutory reserve balance	$ 908,000	$ 863,000	$ 786,000
Transfer to statutory reserve	0	0	0
Capital surplus (reduction)
Stockholders Equity Note
Transfer to statutory reserve	$ 44,515	$ 76,933	$ 78,370