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Loans - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
Loans - Additional Information (Detail) - USD ($)	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Jan. 02, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable
Loans held-in-portfolio, net of unearned income	$ 29,392,510,000	$ 27,007,975,000	$ 29,392,510,000	$ 27,007,975,000			$ 27,406,873,000
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds	155,703,000	122,874,000	311,836,000	337,140,000
Current	26,880,536,000		26,880,536,000				25,603,271,000
Unpaid principal balance							1,223,205,000
Mortgage loans related to buy-back option program	29,586,348,000		29,586,348,000				27,587,856,000
Past Due	2,511,974,000		2,511,974,000				1,803,602,000
Non-accrual with no allowance	218,618,000		218,618,000
Collateral Pledged
Accounts, Notes, Loans and Financing Receivable
Non-accrual with no allowance	218,000,000		218,000,000
Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable
Accruing loans past-due 90 days or more	1,212,947,000		1,212,947,000				460,133,000
Past Due	1,947,315,000		1,947,315,000				1,141,100,000
Buy back option program
Accounts, Notes, Loans and Financing Receivable
Mortgage loans related to buy-back option program	161,000,000		161,000,000				103,000,000
Retail
Accounts, Notes, Loans and Financing Receivable
Purchase of Loans	0	64,000,000	56,000,000	222,000,000
Residential Mortgage
Accounts, Notes, Loans and Financing Receivable
Purchase of Loans	941,000,000	81,000,000	1,100,000,000	266,000,000
Mortgage Loans Sold	62,000,000	18,000,000	101,000,000	46,000,000
GNMA
Accounts, Notes, Loans and Financing Receivable
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds	100,000,000	88,000,000	214,000,000	247,000,000
GNMA \| Buy back option program
Accounts, Notes, Loans and Financing Receivable
Loans held-in-portfolio, net of unearned income					$ 324,000,000
GNMA \| Bulk loan repurchase
Accounts, Notes, Loans and Financing Receivable
Repurchased Loans	688,000,000
GNMA \| Bulk loan repurchase \| Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable
Repurchased Loans	684,000,000
FNMA
Accounts, Notes, Loans and Financing Receivable
Transfers Of Financial Assets Accounted For As Sale Initial Fair Value Of Assets Obtained As Proceeds	54,000,000	33,000,000	94,000,000	84,000,000
Purchased credit deterioration loan
Accounts, Notes, Loans and Financing Receivable
Purchase of Loans	137,000,000		143,000,000
Mortgages
Accounts, Notes, Loans and Financing Receivable
Loans held-in-portfolio, net of unearned income	7,924,441,000	7,168,619,000	7,924,441,000	7,168,619,000			7,183,532,000
Current	5,937,343,000		5,937,343,000				5,884,089,000
Unpaid principal balance							624,368,000
Past Due	1,987,098,000		1,987,098,000				1,299,443,000
Non-accrual with no allowance	145,769,000		145,769,000
Mortgages \| Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable
Accruing loans past-due 90 days or more	1,197,444,000		1,197,444,000				439,662,000
Past Due	1,581,988,000		1,581,988,000				848,742,000
Mortgages \| US Government Agency Insured Loans
Accounts, Notes, Loans and Financing Receivable
Loans held-in-portfolio, net of unearned income	2,100,000,000		2,100,000,000				1,400,000,000
Mortgages \| US Government Agency Insured Loans \| Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable
Past Due	1,200,000,000		1,200,000,000				441,000,000
Mortgages \| Guaranteed by us sponsored entities
Accounts, Notes, Loans and Financing Receivable
Unpaid principal balance	650,000,000		650,000,000				625,000,000
Mortgages \| GNMA \| Buy back option program \| Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable
Accruing loans past-due 90 days or more	161,000,000		161,000,000				103,000,000
Commercial Loans
Accounts, Notes, Loans and Financing Receivable
Purchase of Loans	0	0	3,000,000	43,000,000
Commercial and construction loan
Accounts, Notes, Loans and Financing Receivable
Mortgage Loans Sold	1,000,000	47,000,000	7,000,000	81,000,000
Construction
Accounts, Notes, Loans and Financing Receivable
Loans held-in-portfolio, net of unearned income	936,274,000	754,056,000	936,274,000	754,056,000			831,092,000
Current	900,796,000		900,796,000				829,392,000
Unpaid principal balance							119,000
Past Due	35,478,000		35,478,000				1,700,000
Non-accrual with no allowance	0		0
Construction \| Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable
Accruing loans past-due 90 days or more	0		0				0
Past Due	30,583,000		30,583,000				145,000
Loans with Recourse \| Serviced Mortgage Loans
Accounts, Notes, Loans and Financing Receivable
Repurchased Loans	131,000,000	15,000,000	143,000,000	38,000,000
Loans with Recourse \| Serviced Mortgage Loans \| Bulk loan repurchase
Accounts, Notes, Loans and Financing Receivable
Repurchased Loans	120,000,000
Consumer
Accounts, Notes, Loans and Financing Receivable
Loans held-in-portfolio, net of unearned income		5,831,175,000		5,831,175,000			5,997,886,000
ASC Subtopic 310-30
Accounts, Notes, Loans and Financing Receivable
Outstanding principal balance of SOP loans							1,900,000,000
Loans held-in-portfolio, net of unearned income							153,000,000
Accruing loans past-due 90 days or more						$ 144,000,000
Current						134,000,000
Puerto Rico
Accounts, Notes, Loans and Financing Receivable
Loans held-in-portfolio, net of unearned income	21,664,643,000	19,932,582,000	21,664,643,000	19,932,582,000			20,180,232,000
Current	19,208,449,000		19,208,449,000				18,451,825,000
Unpaid principal balance							1,200,673,000
Past Due	2,456,194,000		2,456,194,000				1,728,407,000
Non-accrual with no allowance	214,537,000		214,537,000
Puerto Rico \| Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable
Accruing loans past-due 90 days or more	1,212,944,000		1,212,944,000				460,133,000
Past Due	1,906,620,000		1,906,620,000				1,093,390,000
Puerto Rico \| Mortgages
Accounts, Notes, Loans and Financing Receivable
Loans held-in-portfolio, net of unearned income	6,826,980,000	6,235,576,000	6,826,980,000	6,235,576,000			6,166,748,000
Current	4,863,266,000		4,863,266,000				4,897,894,000
Unpaid principal balance							614,267,000
Past Due	1,963,714,000		1,963,714,000				1,268,854,000
Non-accrual with no allowance	145,243,000		145,243,000
Puerto Rico \| Mortgages \| Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable
Accruing loans past-due 90 days or more	1,197,444,000		1,197,444,000				439,662,000
Past Due	1,567,504,000		1,567,504,000				837,651,000
Puerto Rico \| Reverse Mortgages
Accounts, Notes, Loans and Financing Receivable
Current	60,000,000		60,000,000				65,000,000
Puerto Rico \| Residential mortgage loans insured By FHA
Accounts, Notes, Loans and Financing Receivable
Accruing loans past-due 90 days or more	318,000,000		318,000,000				213,000,000
Puerto Rico \| Construction
Accounts, Notes, Loans and Financing Receivable
Loans held-in-portfolio, net of unearned income	196,065,000	124,072,000	196,065,000	124,072,000			137,470,000
Current	169,656,000		169,656,000				135,796,000
Unpaid principal balance							119,000
Past Due	26,409,000		26,409,000				1,674,000
Non-accrual with no allowance	0		0
Puerto Rico \| Construction \| Past Due 90 Days or More
Accounts, Notes, Loans and Financing Receivable
Accruing loans past-due 90 days or more	0		0				0
Past Due	$ 21,514,000		$ 21,514,000				119,000
Puerto Rico \| Consumer
Accounts, Notes, Loans and Financing Receivable
Loans held-in-portfolio, net of unearned income		$ 5,381,797,000		$ 5,381,797,000			5,555,377,000
Puerto Rico \| ASC Subtopic 310-30
Accounts, Notes, Loans and Financing Receivable
Loans held-in-portfolio, net of unearned income							$ 134,000,000
Accruing loans past-due 90 days or more						125,000,000
Current						$ 134,000,000