Loans - Amortized cost basis and interest income recognized on non-accrual loans (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	$ 177,104	$ 236,858
Non-accrual with allowance	262,337	311,019
Construction
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance		0
Non-accrual with allowance		485
Mortgages
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	119,098	169,856
Non-accrual with allowance	143,781	186,000
Commercial | Commercial multi-family
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	242	272
Commercial | CRE non-owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	17,093	15,819
Non-accrual with allowance	8,023	5,519
Commercial | CRE owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	14,165	13,491
Non-accrual with allowance	14,920	41,857
Commercial | Commercial and Industrial
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	20,227	30,177
Non-accrual with allowance	18,369	18,444
Leasing
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	458	276
Non-accrual with allowance	5,483	2,826
Consumer | Home equity lines of credit
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	4,110	5,406
Consumer | Personal loans
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	4,623	6,360
Non-accrual with allowance	15,417	15,556
Consumer | Auto Loan
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	1,177	879
Non-accrual with allowance	39,801	22,206
Consumer | Other
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	263	0
Non-accrual with allowance	12,191	12,448
Puerto Rico
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	170,484	236,748
Non-accrual with allowance	231,525	277,541
Puerto Rico | Construction
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance		0
Non-accrual with allowance		485
Puerto Rico | Mortgages
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	119,027	169,827
Non-accrual with allowance	123,364	164,060
Puerto Rico | Commercial | Commercial multi-family
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	242	272
Puerto Rico | Commercial | CRE non-owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	15,639	15,819
Non-accrual with allowance	8,023	4,897
Puerto Rico | Commercial | CRE owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	9,070	13,491
Non-accrual with allowance	14,920	40,844
Puerto Rico | Commercial | Commercial and Industrial
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	20,227	30,177
Non-accrual with allowance	14,050	14,547
Puerto Rico | Leasing
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	458	276
Non-accrual with allowance	5,483	2,826
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	4,623	6,279
Non-accrual with allowance	13,459	14,956
Puerto Rico | Consumer | Auto Loan
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	1,177	879
Non-accrual with allowance	39,801	22,206
Puerto Rico | Consumer | Other
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	263	0
Non-accrual with allowance	12,183	12,448
Popular U.S.
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	6,620	110
Non-accrual with allowance	30,812	33,478
Popular U.S. | Construction
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance		0
Non-accrual with allowance		0
Popular U.S. | Mortgages
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	71	29
Non-accrual with allowance	20,417	21,940
Popular U.S. | Commercial | Commercial multi-family
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	0	0
Popular U.S. | Commercial | CRE non-owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	1,454	0
Non-accrual with allowance	0	622
Popular U.S. | Commercial | CRE owner occupied
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	5,095	0
Non-accrual with allowance	0	1,013
Popular U.S. | Commercial | Commercial and Industrial
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	0
Non-accrual with allowance	4,319	3,897
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	4,110	5,406
Popular U.S. | Consumer | Personal loans
Financing receivable nonaccrual status [Line Items]
Non-accrual with no allowance	0	81
Non-accrual with allowance	1,958	600
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	$ 8	$ 0