Segment Reporting - Additional Information (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) units	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Segment Reporting Information
Number Of Operating Segments | units			2
Factors Used To Identify Entitys Reportable Segments			Banco Popular de Puerto Rico and Popular U.S. Management determined the reportable segments based on the internal reporting used to evaluate performance and to assess where to allocate resources.
Net Revenue	$ 658,651	$ 589,788	$ 1,933,758	$ 1,752,462
Assets	74,189,163	65,910,369	74,189,163	65,910,369	$ 65,926,000
US
Segment Reporting Information
Net Revenue	97,331	95,145	288,619	279,246
Assets	10,900,069		10,900,069		10,878,030
Other
Segment Reporting Information
Net Revenue	19,142	17,780	55,109	54,973
Assets	888,008		888,008		$ 904,016
Banco Popular de Puerto Rico | US
Segment Reporting Information
Net Revenue	38,100	41,700
Assets	565,000	579,000	$ 565,000	$ 579,000
Banco Popular de Puerto Rico | Other
Segment Reporting Information
Net Revenue	$ 34,700	$ 33,500