Segment Reporting - Additional Information (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2021 USD ($) units	Mar. 31, 2020 USD ($)	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	$ 632,765	$ 599,738
Assets	66,870,268	52,803,639	$ 65,926,000
Total deposits	58,742,801		56,866,340
US
Segment Reporting Information
Net Revenue	96,012	91,679
Assets	11,128,729		10,878,030
Total deposits	7,987,426		7,672,549
Other
Segment Reporting Information
Net Revenue	18,044	18,423
Assets	908,770		904,016
Total deposits	1,621,790		$ 1,606,911
Banco Popular de Puerto Rico | US
Segment Reporting Information
Net Revenue	12,700	15,100
Assets	576,000	582,000
Banco Popular de Puerto Rico | Other
Segment Reporting Information
Net Revenue	$ 11,600	$ 11,600