Loans - Amortized cost basis of collateral dependent loans by class (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	$ 30,370,936	$ 29,240,557
Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	455,900	497,988
Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	406,001	449,183
Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	9,431	9,557
Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	555	680
Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	10,164	10,675
Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	29,749	27,893
Mortgages
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	7,261,955	7,427,196
Mortgages | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	160,214	180,700
Mortgages | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	160,214	180,700
Mortgages | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Mortgages | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Mortgages | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Mortgages | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Other | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	263
Other | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0
Other | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0
Other | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0
Other | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0
Other | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	263
Commercial | Commercial multi-family
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	2,132,373	1,962,630
Commercial | Commercial multi-family | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	1,355	1,374
Commercial | Commercial multi-family | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	1,355	1,374
Commercial | Commercial multi-family | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Commercial | Commercial multi-family | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Commercial | Commercial multi-family | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Commercial | Commercial multi-family | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Commercial | CRE non-owner occupied
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	4,120,341	4,613,390
Commercial | CRE non-owner occupied | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	212,029	211,026
Commercial | CRE non-owner occupied | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	212,029	211,026
Commercial | CRE non-owner occupied | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Commercial | CRE non-owner occupied | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Commercial | CRE non-owner occupied | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Commercial | CRE non-owner occupied | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Commercial | CRE owner occupied
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	2,873,561	1,818,102
Commercial | CRE owner occupied | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	24,864	47,268
Commercial | CRE owner occupied | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	24,864	47,268
Commercial | CRE owner occupied | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Commercial | CRE owner occupied | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Commercial | CRE owner occupied | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Commercial | CRE owner occupied | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Commercial | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	5,419,026	5,338,579
Commercial | Commercial and Industrial | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	41,624	41,898
Commercial | Commercial and Industrial | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	1,425	2,650
Commercial | Commercial and Industrial | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Commercial | Commercial and Industrial | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	549	680
Commercial | Commercial and Industrial | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	10,164	10,675
Commercial | Commercial and Industrial | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	29,486	27,893
Consumer | Personal loans
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	1,622,413	1,443,005
Consumer | Personal loans | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	6,114	6,165
Consumer | Personal loans | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	6,114	6,165
Consumer | Personal loans | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Consumer | Personal loans | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Consumer | Personal loans | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Consumer | Personal loans | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Consumer | Auto Loan
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	3,489,976	3,412,187
Consumer | Auto Loan | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	8,539	8,983
Consumer | Auto Loan | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Consumer | Auto Loan | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	8,539	8,983
Consumer | Auto Loan | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Consumer | Auto Loan | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Consumer | Auto Loan | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Consumer | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	138,826	129,206
Leasing
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	1,480,222	1,381,319
Leasing | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	898	574
Leasing | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Leasing | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	892	574
Leasing | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	6	0
Leasing | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Leasing | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	21,481,657	20,865,382
Puerto Rico | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	454,979	497,062
Puerto Rico | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	405,080	448,257
Puerto Rico | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	9,431	9,557
Puerto Rico | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	555	680
Puerto Rico | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	10,164	10,675
Puerto Rico | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	29,749	27,893
Puerto Rico | Mortgages
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	6,041,923	6,251,866
Puerto Rico | Mortgages | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	159,293	179,774
Puerto Rico | Mortgages | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	159,293	179,774
Puerto Rico | Mortgages | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Mortgages | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Mortgages | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Mortgages | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Other | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	263
Puerto Rico | Other | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0
Puerto Rico | Other | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0
Puerto Rico | Other | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0
Puerto Rico | Other | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0
Puerto Rico | Other | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	263
Puerto Rico | Commercial | Commercial multi-family
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	236,554	154,769
Puerto Rico | Commercial | Commercial multi-family | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	1,355	1,374
Puerto Rico | Commercial | Commercial multi-family | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	1,355	1,374
Puerto Rico | Commercial | Commercial multi-family | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Commercial | Commercial multi-family | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Commercial | Commercial multi-family | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Commercial | Commercial multi-family | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Commercial | CRE non-owner occupied
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	2,652,118	2,289,923
Puerto Rico | Commercial | CRE non-owner occupied | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	212,029	211,026
Puerto Rico | Commercial | CRE non-owner occupied | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	212,029	211,026
Puerto Rico | Commercial | CRE non-owner occupied | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Commercial | CRE non-owner occupied | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Commercial | CRE non-owner occupied | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Commercial | CRE non-owner occupied | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Commercial | CRE owner occupied
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	1,406,749	1,423,729
Puerto Rico | Commercial | CRE owner occupied | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	24,864	47,268
Puerto Rico | Commercial | CRE owner occupied | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	24,864	47,268
Puerto Rico | Commercial | CRE owner occupied | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Commercial | CRE owner occupied | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Commercial | CRE owner occupied | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Commercial | CRE owner occupied | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Commercial | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	3,520,683	3,528,448
Puerto Rico | Commercial | Commercial and Industrial | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	41,624	41,898
Puerto Rico | Commercial | Commercial and Industrial | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	1,425	2,650
Puerto Rico | Commercial | Commercial and Industrial | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Commercial | Commercial and Industrial | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	549	680
Puerto Rico | Commercial | Commercial and Industrial | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	10,164	10,675
Puerto Rico | Commercial | Commercial and Industrial | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	29,486	27,893
Puerto Rico | Consumer | Personal loans
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	1,388,100	1,288,060
Puerto Rico | Consumer | Personal loans | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	6,114	6,165
Puerto Rico | Consumer | Personal loans | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	6,114	6,165
Puerto Rico | Consumer | Personal loans | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Consumer | Personal loans | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Consumer | Personal loans | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Consumer | Personal loans | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Consumer | Auto Loan
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	3,489,976	3,412,187
Puerto Rico | Consumer | Auto Loan | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	8,539	8,983
Puerto Rico | Consumer | Auto Loan | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Consumer | Auto Loan | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	8,539	8,983
Puerto Rico | Consumer | Auto Loan | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Consumer | Auto Loan | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Consumer | Auto Loan | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Consumer | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	133,149	124,548
Puerto Rico | Leasing
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	1,480,222	1,381,319
Puerto Rico | Leasing | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	898	574
Puerto Rico | Leasing | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Leasing | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	892	574
Puerto Rico | Leasing | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	6	0
Puerto Rico | Leasing | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Puerto Rico | Leasing | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Popular U.S.
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	8,889,279	8,375,175
Popular U.S. | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	921	926
Popular U.S. | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	921	926
Popular U.S. | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Popular U.S. | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Popular U.S. | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Popular U.S. | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Popular U.S. | Mortgages
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	1,220,032	1,175,330
Popular U.S. | Mortgages | Collateral assets
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	921	926
Popular U.S. | Mortgages | Real Estate
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	921	926
Popular U.S. | Mortgages | Auto
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Popular U.S. | Mortgages | Equipment
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Popular U.S. | Mortgages | Accounts receivable
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Popular U.S. | Mortgages | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	0	0
Popular U.S. | Commercial | Commercial multi-family
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	1,895,819	1,807,861
Popular U.S. | Commercial | CRE non-owner occupied
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	1,468,223	2,323,467
Popular U.S. | Commercial | CRE owner occupied
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	1,466,812	394,373
Popular U.S. | Commercial | Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	1,898,343	1,810,131
Popular U.S. | Consumer | Personal loans
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	234,313	154,945
Popular U.S. | Consumer | Other
Accounts, Notes, Loans and Financing Receivable
Notes Receivable Gross	$ 5,677	$ 4,658