Loans - Amortized cost basis and interest income recognized on non-accrual loans (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Financing receivable nonaccrual status
Non-accrual with no allowance	$ 203,069	$ 236,858
Non-accrual with allowance	274,855	311,019
Construction
Financing receivable nonaccrual status
Non-accrual with no allowance		0
Non-accrual with allowance		485
Mortgages
Financing receivable nonaccrual status
Non-accrual with no allowance	146,342	169,856
Non-accrual with allowance	158,520	186,000
Commercial | Commercial multi-family
Financing receivable nonaccrual status
Non-accrual with no allowance	0	0
Non-accrual with allowance	534	272
Commercial | CRE non-owner occupied
Financing receivable nonaccrual status
Non-accrual with no allowance	15,463	15,819
Non-accrual with allowance	4,972	5,519
Commercial | CRE owner occupied
Financing receivable nonaccrual status
Non-accrual with no allowance	9,528	13,491
Non-accrual with allowance	24,043	41,857
Commercial | Commercial and Industrial
Financing receivable nonaccrual status
Non-accrual with no allowance	24,748	30,177
Non-accrual with allowance	24,651	18,444
Leasing
Financing receivable nonaccrual status
Non-accrual with no allowance	354	276
Non-accrual with allowance	4,311	2,826
Consumer | Home equity lines of credit
Financing receivable nonaccrual status
Non-accrual with no allowance	0	0
Non-accrual with allowance	4,705	5,406
Consumer | Personal loans
Financing receivable nonaccrual status
Non-accrual with no allowance	5,330	6,360
Non-accrual with allowance	14,464	15,556
Consumer | Auto Loan
Financing receivable nonaccrual status
Non-accrual with no allowance	1,041	879
Non-accrual with allowance	27,004	22,206
Consumer | Other
Financing receivable nonaccrual status
Non-accrual with no allowance	263	0
Non-accrual with allowance	11,651	12,448
Puerto Rico
Financing receivable nonaccrual status
Non-accrual with no allowance	203,049	236,748
Non-accrual with allowance	241,782	277,541
Puerto Rico | Construction
Financing receivable nonaccrual status
Non-accrual with no allowance		0
Non-accrual with allowance		485
Puerto Rico | Mortgages
Financing receivable nonaccrual status
Non-accrual with no allowance	146,322	169,827
Non-accrual with allowance	138,348	164,060
Puerto Rico | Commercial | Commercial multi-family
Financing receivable nonaccrual status
Non-accrual with no allowance	0	0
Non-accrual with allowance	254	272
Puerto Rico | Commercial | CRE non-owner occupied
Financing receivable nonaccrual status
Non-accrual with no allowance	15,463	15,819
Non-accrual with allowance	4,972	4,897
Puerto Rico | Commercial | CRE owner occupied
Financing receivable nonaccrual status
Non-accrual with no allowance	9,528	13,491
Non-accrual with allowance	22,627	40,844
Puerto Rico | Commercial | Commercial and Industrial
Financing receivable nonaccrual status
Non-accrual with no allowance	24,748	30,177
Non-accrual with allowance	18,901	14,547
Puerto Rico | Leasing
Financing receivable nonaccrual status
Non-accrual with no allowance	354	276
Non-accrual with allowance	4,311	2,826
Puerto Rico | Consumer | Home equity lines of credit
Financing receivable nonaccrual status
Non-accrual with no allowance	0	0
Non-accrual with allowance	0	0
Puerto Rico | Consumer | Personal loans
Financing receivable nonaccrual status
Non-accrual with no allowance	5,330	6,279
Non-accrual with allowance	13,715	14,956
Puerto Rico | Consumer | Auto Loan
Financing receivable nonaccrual status
Non-accrual with no allowance	1,041	879
Non-accrual with allowance	27,004	22,206
Puerto Rico | Consumer | Other
Financing receivable nonaccrual status
Non-accrual with no allowance	263	0
Non-accrual with allowance	11,650	12,448
Popular U.S.
Financing receivable nonaccrual status
Non-accrual with no allowance	20	110
Non-accrual with allowance	33,073	33,478
Popular U.S. | Construction
Financing receivable nonaccrual status
Non-accrual with no allowance		0
Non-accrual with allowance		0
Popular U.S. | Mortgages
Financing receivable nonaccrual status
Non-accrual with no allowance	20	29
Non-accrual with allowance	20,172	21,940
Popular U.S. | Commercial | Commercial multi-family
Financing receivable nonaccrual status
Non-accrual with no allowance	0	0
Non-accrual with allowance	280	0
Popular U.S. | Commercial | CRE non-owner occupied
Financing receivable nonaccrual status
Non-accrual with no allowance	0	0
Non-accrual with allowance	0	622
Popular U.S. | Commercial | CRE owner occupied
Financing receivable nonaccrual status
Non-accrual with no allowance	0	0
Non-accrual with allowance	1,416	1,013
Popular U.S. | Commercial | Commercial and Industrial
Financing receivable nonaccrual status
Non-accrual with no allowance	0	0
Non-accrual with allowance	5,750	3,897
Popular U.S. | Leasing
Financing receivable nonaccrual status
Non-accrual with no allowance	0	0
Non-accrual with allowance	0	0
Popular U.S. | Consumer | Home equity lines of credit
Financing receivable nonaccrual status
Non-accrual with no allowance	0	0
Non-accrual with allowance	4,705	5,406
Popular U.S. | Consumer | Personal loans
Financing receivable nonaccrual status
Non-accrual with no allowance	0	81
Non-accrual with allowance	749	600
Popular U.S. | Consumer | Auto Loan
Financing receivable nonaccrual status
Non-accrual with no allowance	0	0
Non-accrual with allowance	0	0
Popular U.S. | Consumer | Other
Financing receivable nonaccrual status
Non-accrual with no allowance	0	0
Non-accrual with allowance	$ 1	$ 0