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LOANS HELD FOR INVESTMENT - Corporation's Aging of Loans Held for Investment Portfolio (Parenthetical) (Detail) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	$ 377,553,000	$ 498,303,000
Financing Receivable, before Allowance for Credit Loss	11,140,582,000	11,777,289,000
Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	362,191,000	477,726,000
Financing Receivable, before Allowance for Credit Loss	9,150,483,000	9,788,106,000
Florida region [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	15,362,000	20,577,000
Financing Receivable, before Allowance for Credit Loss	1,990,099,000	1,989,183,000
30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	52,176,000	48,129,000
30-59 Days Past Due [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	48,369,000	47,143,000
30-59 Days Past Due [Member] | Florida region [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	3,807,000	986,000
Consumer Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,806,145,000	2,609,643,000
Consumer Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,788,334,000	2,582,932,000
Consumer Portfolio Segment [Member] | Florida region [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 17,811,000	$ 26,711,000
Consumer Portfolio Segment [Member] | Credit Card [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Threshold Period Past Due, Writeoff	180 days	180 days
Consumer Portfolio Segment [Member] | Credit Card [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Threshold Period Past Due, Writeoff	180 days	180 days
Residential Portfolio Segment [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	$ 3,095,015,000	$ 3,521,954,000
Residential Portfolio Segment [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	2,641,163,000	3,002,203,000
Residential Portfolio Segment [Member] | Florida region [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, before Allowance for Credit Loss	453,852,000	519,751,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	125,431,000	228,478,000
Financing Receivable, before Allowance for Credit Loss	2,960,730,000	3,371,220,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	115,520,000	210,819,000
Financing Receivable, before Allowance for Credit Loss	2,507,751,000	2,852,639,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | Florida region [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	9,911,000	17,659,000
Financing Receivable, before Allowance for Credit Loss	452,979,000	518,581,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Financing Receivable, before Allowance for Credit Loss	69,600,000	111,800,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | 30-59 Days Past Due [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Financing Receivable, before Allowance for Credit Loss	64,700,000	105,200,000
Residential Portfolio Segment [Member] | Conventional residential mortgage loans [Member] | 30-59 Days Past Due [Member] | Florida region [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Financing Receivable, before Allowance for Credit Loss	$ 4,900,000	$ 6,600,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member]
Financing Receivable, Past Due [Line Items]
Period Of Residential Mortgage Loan That Are No Longer Accruing Interest	15 months	15 months
Financing Receivable Recorded Investment 15 Months Past Due And No Still Accruing	$ 52,500,000	$ 57,900,000
Financing Receivable, Past Due	79,429,000	101,466,000
Financing Receivable, before Allowance for Credit Loss	$ 134,285,000	$ 150,734,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Period Of Residential Mortgage Loan That Are No Longer Accruing Interest	15 months	15 months
Financing Receivable Recorded Investment 15 Months Past Due And No Still Accruing	$ 52,500,000	$ 57,900,000
Financing Receivable, Past Due	79,179,000	101,216,000
Financing Receivable, before Allowance for Credit Loss	$ 133,412,000	$ 149,564,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | Florida region [Member]
Financing Receivable, Past Due [Line Items]
Period Of Residential Mortgage Loan That Are No Longer Accruing Interest	15 months	15 months
Financing Receivable Recorded Investment 15 Months Past Due And No Still Accruing	$ 0	$ 0
Financing Receivable, Past Due	250,000	250,000
Financing Receivable, before Allowance for Credit Loss	873,000	1,170,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Financing Receivable, before Allowance for Credit Loss	5,000,000.0	6,100,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | 30-59 Days Past Due [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Financing Receivable, before Allowance for Credit Loss	5,000,000.0	5,900,000
Residential Portfolio Segment [Member] | FHA/VA government-guaranteed loans [Member] | 30-59 Days Past Due [Member] | Florida region [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Financing Receivable, before Allowance for Credit Loss		200,000
Residential Portfolio Segment [Member] | GNMA [Member] | Repurchase Option Program [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	8,500,000	10,700,000
Residential Portfolio Segment [Member] | GNMA [Member] | Repurchase Option Program [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	8,500,000	10,700,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	55,519,000	44,522,000
Financing Receivable, before Allowance for Credit Loss	2,136,502,000	2,230,602,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	55,519,000	44,522,000
Financing Receivable, before Allowance for Credit Loss	1,709,298,000	1,853,224,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | Florida region [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Financing Receivable, before Allowance for Credit Loss	427,204,000	377,378,000
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	6,314,000	5,071,000
Financing Receivable, before Allowance for Credit Loss	8,300,000	5,000,000.0
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | 30-59 Days Past Due [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	6,314,000	5,071,000
Financing Receivable, before Allowance for Credit Loss	8,300,000	5,000,000.0
Commercial Portfolio Segment [Member] | Mortgage Receivable [Member] | 30-59 Days Past Due [Member] | Florida region [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Commercial Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	6,203,000	12,990,000
Financing Receivable, before Allowance for Credit Loss	170,208,000	212,500,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	6,203,000	12,990,000
Financing Receivable, before Allowance for Credit Loss	50,137,000	85,016,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | Florida region [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Financing Receivable, before Allowance for Credit Loss	120,071,000	127,484,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | 30-59 Days Past Due [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Financing Receivable, before Allowance for Credit Loss	1,400,000	100,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | 30-59 Days Past Due [Member] | Puerto Rico and Virgin Islands regions [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	0	0
Financing Receivable, before Allowance for Credit Loss	1,400,000	100,000
Commercial Portfolio Segment [Member] | Construction Loans [Member] | 30-59 Days Past Due [Member] | Florida region [Member]
Financing Receivable, Past Due [Line Items]
Financing Receivable, Past Due	$ 0	$ 0

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