Loans - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Interest income recognized			$ 3,000,000	$ 3,000,000
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds	$ 6,473,000	$ 11,900,000	11,396,000	36,903,000
Loans held in portfolio, net of unearned income	36,194,967,000		36,194,967,000		$ 35,064,971,000
Non-accrual with no allowance	137,309,000		137,309,000		125,958,000
Trading account debt securities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds	6,356,000	11,599,000	11,162,000	35,958,000
Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	350,438,000		350,438,000		341,279,000
Non-accrual with no allowance	137,000,000		137,000,000		126,000,000
Past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	1,288,512,000		1,288,512,000		1,348,071,000
Past due 90 days or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing loans past-due 90 days or more	233,971,000		233,971,000		268,471,000
Loans held in portfolio, net of unearned income	595,369,000		595,369,000		626,082,000
Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	34,906,455,000		34,906,455,000		33,716,900,000
GNMA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Repurchased loans			27,000,000	34,000,000
GNMA | Trading account debt securities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds	3,083,000	1,421,000	4,183,000	2,488,000
FNMA | Trading account debt securities
Accounts, Notes, Loans and Financing Receivable [Line Items]
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds	3,273,000	10,178,000	6,979,000	33,470,000
Consumer loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchase of Loans	0	55,000,000	0	127,000,000
Residential Mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchase of Loans	97,000,000	102,000,000	268,000,000	274,000,000
Mortgage Loans Sold	9,000,000	12,000,000	33,000,000	39,000,000
Commercial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Purchase of Loans	33,000,000	79,000,000	248,000,000	162,000,000
Loans Sold	0	$ 45,000,000	12,000,000	$ 81,000,000
Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	7,993,348,000		7,993,348,000		7,695,917,000
Non-accrual with no allowance	68,454,000		68,454,000		84,797,000
Mortgages | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	76,903,000		76,903,000		86,416,000
Mortgages | Past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	761,771,000		761,771,000		859,537,000
Mortgages | Past due 90 days or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing loans past-due 90 days or more	202,066,000		202,066,000		241,422,000
Loans held in portfolio, net of unearned income	388,420,000		388,420,000		427,719,000
Mortgages | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	7,231,577,000		7,231,577,000		6,836,380,000
Mortgages | GNMA | Buy Back Option Program | Past due 90 days or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing loans past-due 90 days or more	8,000,000		8,000,000		11,000,000
Reverse Mortgages | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	32,000,000		32,000,000		38,000,000
Residential mortgage loans insured By FHA
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-accrual with no allowance	70,000,000		70,000,000		106,000,000
Puerto Rico
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	25,725,474,000		25,725,474,000		24,510,923,000
Non-accrual with no allowance	104,823,000		104,823,000		121,961,000
Puerto Rico | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	306,024,000		306,024,000		329,604,000
Puerto Rico | Past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	1,141,289,000		1,141,289,000		1,204,964,000
Puerto Rico | Past due 90 days or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing loans past-due 90 days or more	233,774,000		233,774,000		268,362,000
Loans held in portfolio, net of unearned income	522,589,000		522,589,000		597,080,000
Puerto Rico | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	24,584,185,000		24,584,185,000		23,305,959,000
Puerto Rico | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	6,695,417,000		6,695,417,000		6,391,824,000
Non-accrual with no allowance	68,248,000		68,248,000		84,677,000
Puerto Rico | Mortgages | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	75,374,000		75,374,000		85,113,000
Puerto Rico | Mortgages | Past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	728,798,000		728,798,000		791,707,000
Puerto Rico | Mortgages | Past due 90 days or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing loans past-due 90 days or more	202,066,000		202,066,000		241,422,000
Loans held in portfolio, net of unearned income	359,986,000		359,986,000		416,528,000
Puerto Rico | Mortgages | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	5,966,619,000		5,966,619,000		5,600,117,000
Popular U.S.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	10,469,493,000		10,469,493,000		10,554,048,000
Non-accrual with no allowance	32,486,000		32,486,000		3,997,000
Popular U.S. | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	44,414,000		44,414,000		11,675,000
Popular U.S. | Past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	147,223,000		147,223,000		143,107,000
Popular U.S. | Past due 90 days or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing loans past-due 90 days or more	197,000		197,000		109,000
Loans held in portfolio, net of unearned income	72,780,000		72,780,000		29,002,000
Popular U.S. | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	10,322,270,000		10,322,270,000		10,410,941,000
Popular U.S. | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	1,297,931,000		1,297,931,000		1,304,093,000
Non-accrual with no allowance	206,000		206,000		120,000
Popular U.S. | Mortgages | Collateral Pledged
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	1,529,000		1,529,000		1,303,000
Popular U.S. | Mortgages | Past due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	32,973,000		32,973,000		67,830,000
Popular U.S. | Mortgages | Past due 90 days or more
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accruing loans past-due 90 days or more	0		0		0
Loans held in portfolio, net of unearned income	28,434,000		28,434,000		11,191,000
Popular U.S. | Mortgages | Current
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held in portfolio, net of unearned income	$ 1,264,958,000		$ 1,264,958,000		$ 1,236,263,000