Loans - Amortized cost basis and interest income recognized on non-accrual loans (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	$ 176,722	$ 177,104
Non-accrual with allowance	235,661	262,337
Mortgages
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	103,543	119,098
Non-accrual with allowance	135,251	143,781
Commercial | Commercial multi-family
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	606	242
Commercial | CRE non-owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	19,324	17,093
Non-accrual with allowance	3,739	8,023
Commercial | CRE owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	29,608	14,165
Non-accrual with allowance	13,266	14,920
Commercial | Commercial and Industrial
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	17,551	20,227
Non-accrual with allowance	17,906	18,369
Leasing
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	194	458
Non-accrual with allowance	5,909	5,483
Consumer | Home equity lines of credit
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	4,618	4,110
Consumer | Personal loans
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	5,122	4,623
Non-accrual with allowance	14,795	15,417
Consumer | Auto Loan
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	1,117	1,177
Non-accrual with allowance	38,399	39,801
Consumer | Other
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	263	263
Non-accrual with allowance	1,172	12,191
Puerto Rico
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	171,400	170,484
Non-accrual with allowance	207,579	231,525
Puerto Rico | Mortgages
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	103,316	119,027
Non-accrual with allowance	120,759	123,364
Puerto Rico | Commercial | Commercial multi-family
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	185	242
Puerto Rico | Commercial | CRE non-owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	19,324	15,639
Non-accrual with allowance	3,532	8,023
Puerto Rico | Commercial | CRE owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	24,513	9,070
Non-accrual with allowance	13,266	14,920
Puerto Rico | Commercial | Commercial and Industrial
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	17,551	20,227
Non-accrual with allowance	12,581	14,050
Puerto Rico | Leasing
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	194	458
Non-accrual with allowance	5,909	5,483
Puerto Rico | Consumer | Home equity lines of credit
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	0	0
Puerto Rico | Consumer | Personal loans
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	5,122	4,623
Non-accrual with allowance	12,290	13,459
Puerto Rico | Consumer | Auto Loan
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	1,117	1,177
Non-accrual with allowance	38,399	39,801
Puerto Rico | Consumer | Other
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	263	263
Non-accrual with allowance	658	12,183
Popular U.S.
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	5,322	6,620
Non-accrual with allowance	28,082	30,812
Popular U.S. | Mortgages
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	227	71
Non-accrual with allowance	14,492	20,417
Popular U.S. | Commercial | Commercial multi-family
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	421	0
Popular U.S. | Commercial | CRE non-owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	1,454
Non-accrual with allowance	207	0
Popular U.S. | Commercial | CRE owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	5,095	5,095
Non-accrual with allowance	0	0
Popular U.S. | Commercial | Commercial and Industrial
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	5,325	4,319
Popular U.S. | Leasing
Financing receivable nonaccrual status [Line Items]
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 [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	4,618	4,110
Popular U.S. | Consumer | Personal loans
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	2,505	1,958
Popular U.S. | Consumer | Auto Loan
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	0	0
Popular U.S. | Consumer | Other
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	$ 514	$ 8